removing speaker, printf

flipbip.c

@@ -39,7 +39,7 @@ FlipBip* flipbip_app_alloc() {
     app->submenu = submenu_alloc();
 
     app->haptic = 1;
-    app->speaker = 1;
+    //app->speaker = 1;
     app->led = 1;
     app->bip39_strength = 2; // 256 bits (24 words)
 

flipbip.h

@@ -26,7 +26,7 @@ typedef struct {
     FlipBipScene1* flipbip_scene_1;
     // FlipBipScene2* flipbip_scene_2;
     int haptic; 
-    int speaker;
+    // int speaker;
     int led;
     int bip39_strength;
 } FlipBip;
@@ -44,10 +44,10 @@ typedef enum {
     FlipBipHapticOn,
 } FlipBipHapticState;
 
-typedef enum {
-    FlipBipSpeakerOff,
-    FlipBipSpeakerOn,
-} FlipBipSpeakerState;
+// typedef enum {
+//     FlipBipSpeakerOff,
+//     FlipBipSpeakerOn,
+// } FlipBipSpeakerState;
 
 typedef enum {
     FlipBipLedOff,

helpers/printf.c

@@ -1,914 +1,914 @@
-///////////////////////////////////////////////////////////////////////////////
-// \author (c) Marco Paland (info@paland.com)
-//             2014-2019, PALANDesign Hannover, Germany
-//
-// \license The MIT License (MIT)
-//
-// Permission is hereby granted, free of charge, to any person obtaining a copy
-// of this software and associated documentation files (the "Software"), to deal
-// in the Software without restriction, including without limitation the rights
-// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-// copies of the Software, and to permit persons to whom the Software is
-// furnished to do so, subject to the following conditions:
-//
-// The above copyright notice and this permission notice shall be included in
-// all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-// THE SOFTWARE.
-//
-// \brief Tiny printf, sprintf and (v)snprintf implementation, optimized for speed on
-//        embedded systems with a very limited resources. These routines are thread
-//        safe and reentrant!
-//        Use this instead of the bloated standard/newlib printf cause these use
-//        malloc for printf (and may not be thread safe).
-//
-///////////////////////////////////////////////////////////////////////////////
-
-#include <stdbool.h>
-#include <stdint.h>
-
-#include "printf.h"
-
-
-// define this globally (e.g. gcc -DPRINTF_INCLUDE_CONFIG_H ...) to include the
-// printf_config.h header file
-// default: undefined
-#ifdef PRINTF_INCLUDE_CONFIG_H
-#include "printf_config.h"
-#endif
-
-
-// 'ntoa' conversion buffer size, this must be big enough to hold one converted
-// numeric number including padded zeros (dynamically created on stack)
-// default: 32 byte
-#ifndef PRINTF_NTOA_BUFFER_SIZE
-#define PRINTF_NTOA_BUFFER_SIZE    32U
-#endif
-
-// 'ftoa' conversion buffer size, this must be big enough to hold one converted
-// float number including padded zeros (dynamically created on stack)
-// default: 32 byte
-#ifndef PRINTF_FTOA_BUFFER_SIZE
-#define PRINTF_FTOA_BUFFER_SIZE    32U
-#endif
-
-// support for the floating point type (%f)
-// default: activated
-#ifndef PRINTF_DISABLE_SUPPORT_FLOAT
-#define PRINTF_SUPPORT_FLOAT
-#endif
-
-// support for exponential floating point notation (%e/%g)
-// default: activated
-#ifndef PRINTF_DISABLE_SUPPORT_EXPONENTIAL
-#define PRINTF_SUPPORT_EXPONENTIAL
-#endif
-
-// define the default floating point precision
-// default: 6 digits
-#ifndef PRINTF_DEFAULT_FLOAT_PRECISION
-#define PRINTF_DEFAULT_FLOAT_PRECISION  6U
-#endif
-
-// define the largest float suitable to print with %f
-// default: 1e9
-#ifndef PRINTF_MAX_FLOAT
-#define PRINTF_MAX_FLOAT  1e9
-#endif
-
-// support for the long long types (%llu or %p)
-// default: activated
-#ifndef PRINTF_DISABLE_SUPPORT_LONG_LONG
-#define PRINTF_SUPPORT_LONG_LONG
-#endif
-
-// support for the ptrdiff_t type (%t)
-// ptrdiff_t is normally defined in <stddef.h> as long or long long type
-// default: activated
-#ifndef PRINTF_DISABLE_SUPPORT_PTRDIFF_T
-#define PRINTF_SUPPORT_PTRDIFF_T
-#endif
-
-///////////////////////////////////////////////////////////////////////////////
-
-// internal flag definitions
-#define FLAGS_ZEROPAD   (1U <<  0U)
-#define FLAGS_LEFT      (1U <<  1U)
-#define FLAGS_PLUS      (1U <<  2U)
-#define FLAGS_SPACE     (1U <<  3U)
-#define FLAGS_HASH      (1U <<  4U)
-#define FLAGS_UPPERCASE (1U <<  5U)
-#define FLAGS_CHAR      (1U <<  6U)
-#define FLAGS_SHORT     (1U <<  7U)
-#define FLAGS_LONG      (1U <<  8U)
-#define FLAGS_LONG_LONG (1U <<  9U)
-#define FLAGS_PRECISION (1U << 10U)
-#define FLAGS_ADAPT_EXP (1U << 11U)
-
-
-// import float.h for DBL_MAX
-#if defined(PRINTF_SUPPORT_FLOAT)
-#include <float.h>
-#endif
-
-
-// output function type
-typedef void (*out_fct_type)(char character, void* buffer, size_t idx, size_t maxlen);
-
-
-// wrapper (used as buffer) for output function type
-typedef struct {
-  void  (*fct)(char character, void* arg);
-  void* arg;
-} out_fct_wrap_type;
-
-
-// internal buffer output
-static inline void _out_buffer(char character, void* buffer, size_t idx, size_t maxlen)
-{
-  if (idx < maxlen) {
-    ((char*)buffer)[idx] = character;
-  }
-}
-
-
-// internal null output
-static inline void _out_null(char character, void* buffer, size_t idx, size_t maxlen)
-{
-  (void)character; (void)buffer; (void)idx; (void)maxlen;
-}
-
-
-// internal _putchar wrapper
-static inline void _out_char(char character, void* buffer, size_t idx, size_t maxlen)
-{
-  (void)buffer; (void)idx; (void)maxlen;
-  if (character) {
-    _putchar(character);
-  }
-}
-
-
-// internal output function wrapper
-static inline void _out_fct(char character, void* buffer, size_t idx, size_t maxlen)
-{
-  (void)idx; (void)maxlen;
-  if (character) {
-    // buffer is the output fct pointer
-    ((out_fct_wrap_type*)buffer)->fct(character, ((out_fct_wrap_type*)buffer)->arg);
-  }
-}
-
-
-// internal secure strlen
-// \return The length of the string (excluding the terminating 0) limited by 'maxsize'
-static inline unsigned int _strnlen_s(const char* str, size_t maxsize)
-{
-  const char* s;
-  for (s = str; *s && maxsize--; ++s);
-  return (unsigned int)(s - str);
-}
-
-
-// internal test if char is a digit (0-9)
-// \return true if char is a digit
-static inline bool _is_digit(char ch)
-{
-  return (ch >= '0') && (ch <= '9');
-}
-
-
-// internal ASCII string to unsigned int conversion
-static unsigned int _atoi(const char** str)
-{
-  unsigned int i = 0U;
-  while (_is_digit(**str)) {
-    i = i * 10U + (unsigned int)(*((*str)++) - '0');
-  }
-  return i;
-}
-
-
-// output the specified string in reverse, taking care of any zero-padding
-static size_t _out_rev(out_fct_type out, char* buffer, size_t idx, size_t maxlen, const char* buf, size_t len, unsigned int width, unsigned int flags)
-{
-  const size_t start_idx = idx;
-
-  // pad spaces up to given width
-  if (!(flags & FLAGS_LEFT) && !(flags & FLAGS_ZEROPAD)) {
-    for (size_t i = len; i < width; i++) {
-      out(' ', buffer, idx++, maxlen);
-    }
-  }
-
-  // reverse string
-  while (len) {
-    out(buf[--len], buffer, idx++, maxlen);
-  }
-
-  // append pad spaces up to given width
-  if (flags & FLAGS_LEFT) {
-    while (idx - start_idx < width) {
-      out(' ', buffer, idx++, maxlen);
-    }
-  }
-
-  return idx;
-}
-
-
-// internal itoa format
-static size_t _ntoa_format(out_fct_type out, char* buffer, size_t idx, size_t maxlen, char* buf, size_t len, bool negative, unsigned int base, unsigned int prec, unsigned int width, unsigned int flags)
-{
-  // pad leading zeros
-  if (!(flags & FLAGS_LEFT)) {
-    if (width && (flags & FLAGS_ZEROPAD) && (negative || (flags & (FLAGS_PLUS | FLAGS_SPACE)))) {
-      width--;
-    }
-    while ((len < prec) && (len < PRINTF_NTOA_BUFFER_SIZE)) {
-      buf[len++] = '0';
-    }
-    while ((flags & FLAGS_ZEROPAD) && (len < width) && (len < PRINTF_NTOA_BUFFER_SIZE)) {
-      buf[len++] = '0';
-    }
-  }
-
-  // handle hash
-  if (flags & FLAGS_HASH) {
-    if (!(flags & FLAGS_PRECISION) && len && ((len == prec) || (len == width))) {
-      len--;
-      if (len && (base == 16U)) {
-        len--;
-      }
-    }
-    if ((base == 16U) && !(flags & FLAGS_UPPERCASE) && (len < PRINTF_NTOA_BUFFER_SIZE)) {
-      buf[len++] = 'x';
-    }
-    else if ((base == 16U) && (flags & FLAGS_UPPERCASE) && (len < PRINTF_NTOA_BUFFER_SIZE)) {
-      buf[len++] = 'X';
-    }
-    else if ((base == 2U) && (len < PRINTF_NTOA_BUFFER_SIZE)) {
-      buf[len++] = 'b';
-    }
-    if (len < PRINTF_NTOA_BUFFER_SIZE) {
-      buf[len++] = '0';
-    }
-  }
-
-  if (len < PRINTF_NTOA_BUFFER_SIZE) {
-    if (negative) {
-      buf[len++] = '-';
-    }
-    else if (flags & FLAGS_PLUS) {
-      buf[len++] = '+';  // ignore the space if the '+' exists
-    }
-    else if (flags & FLAGS_SPACE) {
-      buf[len++] = ' ';
-    }
-  }
-
-  return _out_rev(out, buffer, idx, maxlen, buf, len, width, flags);
-}
-
-
-// internal itoa for 'long' type
-static size_t _ntoa_long(out_fct_type out, char* buffer, size_t idx, size_t maxlen, unsigned long value, bool negative, unsigned long base, unsigned int prec, unsigned int width, unsigned int flags)
-{
-  char buf[PRINTF_NTOA_BUFFER_SIZE];
-  size_t len = 0U;
-
-  // no hash for 0 values
-  if (!value) {
-    flags &= ~FLAGS_HASH;
-  }
-
-  // write if precision != 0 and value is != 0
-  if (!(flags & FLAGS_PRECISION) || value) {
-    do {
-      const char digit = (char)(value % base);
-      buf[len++] = digit < 10 ? '0' + digit : (flags & FLAGS_UPPERCASE ? 'A' : 'a') + digit - 10;
-      value /= base;
-    } while (value && (len < PRINTF_NTOA_BUFFER_SIZE));
-  }
-
-  return _ntoa_format(out, buffer, idx, maxlen, buf, len, negative, (unsigned int)base, prec, width, flags);
-}
-
-
-// internal itoa for 'long long' type
-#if defined(PRINTF_SUPPORT_LONG_LONG)
-static size_t _ntoa_long_long(out_fct_type out, char* buffer, size_t idx, size_t maxlen, unsigned long long value, bool negative, unsigned long long base, unsigned int prec, unsigned int width, unsigned int flags)
-{
-  char buf[PRINTF_NTOA_BUFFER_SIZE];
-  size_t len = 0U;
-
-  // no hash for 0 values
-  if (!value) {
-    flags &= ~FLAGS_HASH;
-  }
-
-  // write if precision != 0 and value is != 0
-  if (!(flags & FLAGS_PRECISION) || value) {
-    do {
-      const char digit = (char)(value % base);
-      buf[len++] = digit < 10 ? '0' + digit : (flags & FLAGS_UPPERCASE ? 'A' : 'a') + digit - 10;
-      value /= base;
-    } while (value && (len < PRINTF_NTOA_BUFFER_SIZE));
-  }
-
-  return _ntoa_format(out, buffer, idx, maxlen, buf, len, negative, (unsigned int)base, prec, width, flags);
-}
-#endif  // PRINTF_SUPPORT_LONG_LONG
-
-
-#if defined(PRINTF_SUPPORT_FLOAT)
-
-#if defined(PRINTF_SUPPORT_EXPONENTIAL)
-// forward declaration so that _ftoa can switch to exp notation for values > PRINTF_MAX_FLOAT
-static size_t _etoa(out_fct_type out, char* buffer, size_t idx, size_t maxlen, double value, unsigned int prec, unsigned int width, unsigned int flags);
-#endif
-
-
-// internal ftoa for fixed decimal floating point
-static size_t _ftoa(out_fct_type out, char* buffer, size_t idx, size_t maxlen, double value, unsigned int prec, unsigned int width, unsigned int flags)
-{
-  char buf[PRINTF_FTOA_BUFFER_SIZE];
-  size_t len  = 0U;
-  double diff = 0.0;
-
-  // powers of 10
-  static const double pow10[] = { 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 100000000, 1000000000 };
-
-  // test for special values
-  if (value != value)
-    return _out_rev(out, buffer, idx, maxlen, "nan", 3, width, flags);
-  if (value < -DBL_MAX)
-    return _out_rev(out, buffer, idx, maxlen, "fni-", 4, width, flags);
-  if (value > DBL_MAX)
-    return _out_rev(out, buffer, idx, maxlen, (flags & FLAGS_PLUS) ? "fni+" : "fni", (flags & FLAGS_PLUS) ? 4U : 3U, width, flags);
-
-  // test for very large values
-  // standard printf behavior is to print EVERY whole number digit -- which could be 100s of characters overflowing your buffers == bad
-  if ((value > PRINTF_MAX_FLOAT) || (value < -PRINTF_MAX_FLOAT)) {
-#if defined(PRINTF_SUPPORT_EXPONENTIAL)
-    return _etoa(out, buffer, idx, maxlen, value, prec, width, flags);
-#else
-    return 0U;
-#endif
-  }
-
-  // test for negative
-  bool negative = false;
-  if (value < 0) {
-    negative = true;
-    value = 0 - value;
-  }
-
-  // set default precision, if not set explicitly
-  if (!(flags & FLAGS_PRECISION)) {
-    prec = PRINTF_DEFAULT_FLOAT_PRECISION;
-  }
-  // limit precision to 9, cause a prec >= 10 can lead to overflow errors
-  while ((len < PRINTF_FTOA_BUFFER_SIZE) && (prec > 9U)) {
-    buf[len++] = '0';
-    prec--;
-  }
-
-  int whole = (int)value;
-  double tmp = (value - whole) * pow10[prec];
-  unsigned long frac = (unsigned long)tmp;
-  diff = tmp - frac;
-
-  if (diff > 0.5) {
-    ++frac;
-    // handle rollover, e.g. case 0.99 with prec 1 is 1.0
-    if (frac >= pow10[prec]) {
-      frac = 0;
-      ++whole;
-    }
-  }
-  else if (diff < 0.5) {
-  }
-  else if ((frac == 0U) || (frac & 1U)) {
-    // if halfway, round up if odd OR if last digit is 0
-    ++frac;
-  }
-
-  if (prec == 0U) {
-    diff = value - (double)whole;
-    if ((!(diff < 0.5) || (diff > 0.5)) && (whole & 1)) {
-      // exactly 0.5 and ODD, then round up
-      // 1.5 -> 2, but 2.5 -> 2
-      ++whole;
-    }
-  }
-  else {
-    unsigned int count = prec;
-    // now do fractional part, as an unsigned number
-    while (len < PRINTF_FTOA_BUFFER_SIZE) {
-      --count;
-      buf[len++] = (char)(48U + (frac % 10U));
-      if (!(frac /= 10U)) {
-        break;
-      }
-    }
-    // add extra 0s
-    while ((len < PRINTF_FTOA_BUFFER_SIZE) && (count-- > 0U)) {
-      buf[len++] = '0';
-    }
-    if (len < PRINTF_FTOA_BUFFER_SIZE) {
-      // add decimal
-      buf[len++] = '.';
-    }
-  }
-
-  // do whole part, number is reversed
-  while (len < PRINTF_FTOA_BUFFER_SIZE) {
-    buf[len++] = (char)(48 + (whole % 10));
-    if (!(whole /= 10)) {
-      break;
-    }
-  }
-
-  // pad leading zeros
-  if (!(flags & FLAGS_LEFT) && (flags & FLAGS_ZEROPAD)) {
-    if (width && (negative || (flags & (FLAGS_PLUS | FLAGS_SPACE)))) {
-      width--;
-    }
-    while ((len < width) && (len < PRINTF_FTOA_BUFFER_SIZE)) {
-      buf[len++] = '0';
-    }
-  }
-
-  if (len < PRINTF_FTOA_BUFFER_SIZE) {
-    if (negative) {
-      buf[len++] = '-';
-    }
-    else if (flags & FLAGS_PLUS) {
-      buf[len++] = '+';  // ignore the space if the '+' exists
-    }
-    else if (flags & FLAGS_SPACE) {
-      buf[len++] = ' ';
-    }
-  }
-
-  return _out_rev(out, buffer, idx, maxlen, buf, len, width, flags);
-}
-
-
-#if defined(PRINTF_SUPPORT_EXPONENTIAL)
-// internal ftoa variant for exponential floating-point type, contributed by Martijn Jasperse <m.jasperse@gmail.com>
-static size_t _etoa(out_fct_type out, char* buffer, size_t idx, size_t maxlen, double value, unsigned int prec, unsigned int width, unsigned int flags)
-{
-  // check for NaN and special values
-  if ((value != value) || (value > DBL_MAX) || (value < -DBL_MAX)) {
-    return _ftoa(out, buffer, idx, maxlen, value, prec, width, flags);
-  }
-
-  // determine the sign
-  const bool negative = value < 0;
-  if (negative) {
-    value = -value;
-  }
-
-  // default precision
-  if (!(flags & FLAGS_PRECISION)) {
-    prec = PRINTF_DEFAULT_FLOAT_PRECISION;
-  }
-
-  // determine the decimal exponent
-  // based on the algorithm by David Gay (https://www.ampl.com/netlib/fp/dtoa.c)
-  union {
-    uint64_t U;
-    double   F;
-  } conv;
-
-  conv.F = value;
-  int exp2 = (int)((conv.U >> 52U) & 0x07FFU) - 1023;           // effectively log2
-  conv.U = (conv.U & ((1ULL << 52U) - 1U)) | (1023ULL << 52U);  // drop the exponent so conv.F is now in [1,2)
-  // now approximate log10 from the log2 integer part and an expansion of ln around 1.5
-  int expval = (int)(0.1760912590558 + exp2 * 0.301029995663981 + (conv.F - 1.5) * 0.289529654602168);
-  // now we want to compute 10^expval but we want to be sure it won't overflow
-  exp2 = (int)(expval * 3.321928094887362 + 0.5);
-  const double z  = expval * 2.302585092994046 - exp2 * 0.6931471805599453;
-  const double z2 = z * z;
-  conv.U = (uint64_t)(exp2 + 1023) << 52U;
-  // compute exp(z) using continued fractions, see https://en.wikipedia.org/wiki/Exponential_function#Continued_fractions_for_ex
-  conv.F *= 1 + 2 * z / (2 - z + (z2 / (6 + (z2 / (10 + z2 / 14)))));
-  // correct for rounding errors
-  if (value < conv.F) {
-    expval--;
-    conv.F /= 10;
-  }
-
-  // the exponent format is "%+03d" and largest value is "307", so set aside 4-5 characters
-  unsigned int minwidth = ((expval < 100) && (expval > -100)) ? 4U : 5U;
-
-  // in "%g" mode, "prec" is the number of *significant figures* not decimals
-  if (flags & FLAGS_ADAPT_EXP) {
-    // do we want to fall-back to "%f" mode?
-    if ((value >= 1e-4) && (value < 1e6)) {
-      if ((int)prec > expval) {
-        prec = (unsigned)((int)prec - expval - 1);
-      }
-      else {
-        prec = 0;
-      }
-      flags |= FLAGS_PRECISION;   // make sure _ftoa respects precision
-      // no characters in exponent
-      minwidth = 0U;
-      expval   = 0;
-    }
-    else {
-      // we use one sigfig for the whole part
-      if ((prec > 0) && (flags & FLAGS_PRECISION)) {
-        --prec;
-      }
-    }
-  }
-
-  // will everything fit?
-  unsigned int fwidth = width;
-  if (width > minwidth) {
-    // we didn't fall-back so subtract the characters required for the exponent
-    fwidth -= minwidth;
-  } else {
-    // not enough characters, so go back to default sizing
-    fwidth = 0U;
-  }
-  if ((flags & FLAGS_LEFT) && minwidth) {
-    // if we're padding on the right, DON'T pad the floating part
-    fwidth = 0U;
-  }
-
-  // rescale the float value
-  if (expval) {
-    value /= conv.F;
-  }
-
-  // output the floating part
-  const size_t start_idx = idx;
-  idx = _ftoa(out, buffer, idx, maxlen, negative ? -value : value, prec, fwidth, flags & ~FLAGS_ADAPT_EXP);
-
-  // output the exponent part
-  if (minwidth) {
-    // output the exponential symbol
-    out((flags & FLAGS_UPPERCASE) ? 'E' : 'e', buffer, idx++, maxlen);
-    // output the exponent value
-    idx = _ntoa_long(out, buffer, idx, maxlen, (expval < 0) ? -expval : expval, expval < 0, 10, 0, minwidth-1, FLAGS_ZEROPAD | FLAGS_PLUS);
-    // might need to right-pad spaces
-    if (flags & FLAGS_LEFT) {
-      while (idx - start_idx < width) out(' ', buffer, idx++, maxlen);
-    }
-  }
-  return idx;
-}
-#endif  // PRINTF_SUPPORT_EXPONENTIAL
-#endif  // PRINTF_SUPPORT_FLOAT
-
-
-// internal vsnprintf
-static int _vsnprintf(out_fct_type out, char* buffer, const size_t maxlen, const char* format, va_list va)
-{
-  unsigned int flags, width, precision, n;
-  size_t idx = 0U;
-
-  if (!buffer) {
-    // use null output function
-    out = _out_null;
-  }
-
-  while (*format)
-  {
-    // format specifier?  %[flags][width][.precision][length]
-    if (*format != '%') {
-      // no
-      out(*format, buffer, idx++, maxlen);
-      format++;
-      continue;
-    }
-    else {
-      // yes, evaluate it
-      format++;
-    }
-
-    // evaluate flags
-    flags = 0U;
-    do {
-      switch (*format) {
-        case '0': flags |= FLAGS_ZEROPAD; format++; n = 1U; break;
-        case '-': flags |= FLAGS_LEFT;    format++; n = 1U; break;
-        case '+': flags |= FLAGS_PLUS;    format++; n = 1U; break;
-        case ' ': flags |= FLAGS_SPACE;   format++; n = 1U; break;
-        case '#': flags |= FLAGS_HASH;    format++; n = 1U; break;
-        default :                                   n = 0U; break;
-      }
-    } while (n);
-
-    // evaluate width field
-    width = 0U;
-    if (_is_digit(*format)) {
-      width = _atoi(&format);
-    }
-    else if (*format == '*') {
-      const int w = va_arg(va, int);
-      if (w < 0) {
-        flags |= FLAGS_LEFT;    // reverse padding
-        width = (unsigned int)-w;
-      }
-      else {
-        width = (unsigned int)w;
-      }
-      format++;
-    }
-
-    // evaluate precision field
-    precision = 0U;
-    if (*format == '.') {
-      flags |= FLAGS_PRECISION;
-      format++;
-      if (_is_digit(*format)) {
-        precision = _atoi(&format);
-      }
-      else if (*format == '*') {
-        const int prec = (int)va_arg(va, int);
-        precision = prec > 0 ? (unsigned int)prec : 0U;
-        format++;
-      }
-    }
-
-    // evaluate length field
-    switch (*format) {
-      case 'l' :
-        flags |= FLAGS_LONG;
-        format++;
-        if (*format == 'l') {
-          flags |= FLAGS_LONG_LONG;
-          format++;
-        }
-        break;
-      case 'h' :
-        flags |= FLAGS_SHORT;
-        format++;
-        if (*format == 'h') {
-          flags |= FLAGS_CHAR;
-          format++;
-        }
-        break;
-#if defined(PRINTF_SUPPORT_PTRDIFF_T)
-      case 't' :
-        flags |= (sizeof(ptrdiff_t) == sizeof(long) ? FLAGS_LONG : FLAGS_LONG_LONG);
-        format++;
-        break;
-#endif
-      case 'j' :
-        flags |= (sizeof(intmax_t) == sizeof(long) ? FLAGS_LONG : FLAGS_LONG_LONG);
-        format++;
-        break;
-      case 'z' :
-        flags |= (sizeof(size_t) == sizeof(long) ? FLAGS_LONG : FLAGS_LONG_LONG);
-        format++;
-        break;
-      default :
-        break;
-    }
-
-    // evaluate specifier
-    switch (*format) {
-      case 'd' :
-      case 'i' :
-      case 'u' :
-      case 'x' :
-      case 'X' :
-      case 'o' :
-      case 'b' : {
-        // set the base
-        unsigned int base;
-        if (*format == 'x' || *format == 'X') {
-          base = 16U;
-        }
-        else if (*format == 'o') {
-          base =  8U;
-        }
-        else if (*format == 'b') {
-          base =  2U;
-        }
-        else {
-          base = 10U;
-          flags &= ~FLAGS_HASH;   // no hash for dec format
-        }
-        // uppercase
-        if (*format == 'X') {
-          flags |= FLAGS_UPPERCASE;
-        }
-
-        // no plus or space flag for u, x, X, o, b
-        if ((*format != 'i') && (*format != 'd')) {
-          flags &= ~(FLAGS_PLUS | FLAGS_SPACE);
-        }
-
-        // ignore '0' flag when precision is given
-        if (flags & FLAGS_PRECISION) {
-          flags &= ~FLAGS_ZEROPAD;
-        }
-
-        // convert the integer
-        if ((*format == 'i') || (*format == 'd')) {
-          // signed
-          if (flags & FLAGS_LONG_LONG) {
-#if defined(PRINTF_SUPPORT_LONG_LONG)
-            const long long value = va_arg(va, long long);
-            idx = _ntoa_long_long(out, buffer, idx, maxlen, (unsigned long long)(value > 0 ? value : 0 - value), value < 0, base, precision, width, flags);
-#endif
-          }
-          else if (flags & FLAGS_LONG) {
-            const long value = va_arg(va, long);
-            idx = _ntoa_long(out, buffer, idx, maxlen, (unsigned long)(value > 0 ? value : 0 - value), value < 0, base, precision, width, flags);
-          }
-          else {
-            const int value = (flags & FLAGS_CHAR) ? (char)va_arg(va, int) : (flags & FLAGS_SHORT) ? (short int)va_arg(va, int) : va_arg(va, int);
-            idx = _ntoa_long(out, buffer, idx, maxlen, (unsigned int)(value > 0 ? value : 0 - value), value < 0, base, precision, width, flags);
-          }
-        }
-        else {
-          // unsigned
-          if (flags & FLAGS_LONG_LONG) {
-#if defined(PRINTF_SUPPORT_LONG_LONG)
-            idx = _ntoa_long_long(out, buffer, idx, maxlen, va_arg(va, unsigned long long), false, base, precision, width, flags);
-#endif
-          }
-          else if (flags & FLAGS_LONG) {
-            idx = _ntoa_long(out, buffer, idx, maxlen, va_arg(va, unsigned long), false, base, precision, width, flags);
-          }
-          else {
-            const unsigned int value = (flags & FLAGS_CHAR) ? (unsigned char)va_arg(va, unsigned int) : (flags & FLAGS_SHORT) ? (unsigned short int)va_arg(va, unsigned int) : va_arg(va, unsigned int);
-            idx = _ntoa_long(out, buffer, idx, maxlen, value, false, base, precision, width, flags);
-          }
-        }
-        format++;
-        break;
-      }
-#if defined(PRINTF_SUPPORT_FLOAT)
-      case 'f' :
-      case 'F' :
-        if (*format == 'F') flags |= FLAGS_UPPERCASE;
-        idx = _ftoa(out, buffer, idx, maxlen, va_arg(va, double), precision, width, flags);
-        format++;
-        break;
-#if defined(PRINTF_SUPPORT_EXPONENTIAL)
-      case 'e':
-      case 'E':
-      case 'g':
-      case 'G':
-        if ((*format == 'g')||(*format == 'G')) flags |= FLAGS_ADAPT_EXP;
-        if ((*format == 'E')||(*format == 'G')) flags |= FLAGS_UPPERCASE;
-        idx = _etoa(out, buffer, idx, maxlen, va_arg(va, double), precision, width, flags);
-        format++;
-        break;
-#endif  // PRINTF_SUPPORT_EXPONENTIAL
-#endif  // PRINTF_SUPPORT_FLOAT
-      case 'c' : {
-        unsigned int l = 1U;
-        // pre padding
-        if (!(flags & FLAGS_LEFT)) {
-          while (l++ < width) {
-            out(' ', buffer, idx++, maxlen);
-          }
-        }
-        // char output
-        out((char)va_arg(va, int), buffer, idx++, maxlen);
-        // post padding
-        if (flags & FLAGS_LEFT) {
-          while (l++ < width) {
-            out(' ', buffer, idx++, maxlen);
-          }
-        }
-        format++;
-        break;
-      }
-
-      case 's' : {
-        const char* p = va_arg(va, char*);
-        unsigned int l = _strnlen_s(p, precision ? precision : (size_t)-1);
-        // pre padding
-        if (flags & FLAGS_PRECISION) {
-          l = (l < precision ? l : precision);
-        }
-        if (!(flags & FLAGS_LEFT)) {
-          while (l++ < width) {
-            out(' ', buffer, idx++, maxlen);
-          }
-        }
-        // string output
-        while ((*p != 0) && (!(flags & FLAGS_PRECISION) || precision--)) {
-          out(*(p++), buffer, idx++, maxlen);
-        }
-        // post padding
-        if (flags & FLAGS_LEFT) {
-          while (l++ < width) {
-            out(' ', buffer, idx++, maxlen);
-          }
-        }
-        format++;
-        break;
-      }
-
-      case 'p' : {
-        width = sizeof(void*) * 2U;
-        flags |= FLAGS_ZEROPAD | FLAGS_UPPERCASE;
-#if defined(PRINTF_SUPPORT_LONG_LONG)
-        const bool is_ll = sizeof(uintptr_t) == sizeof(long long);
-        if (is_ll) {
-          idx = _ntoa_long_long(out, buffer, idx, maxlen, (uintptr_t)va_arg(va, void*), false, 16U, precision, width, flags);
-        }
-        else {
-#endif
-          idx = _ntoa_long(out, buffer, idx, maxlen, (unsigned long)((uintptr_t)va_arg(va, void*)), false, 16U, precision, width, flags);
-#if defined(PRINTF_SUPPORT_LONG_LONG)
-        }
-#endif
-        format++;
-        break;
-      }
-
-      case '%' :
-        out('%', buffer, idx++, maxlen);
-        format++;
-        break;
-
-      default :
-        out(*format, buffer, idx++, maxlen);
-        format++;
-        break;
-    }
-  }
-
-  // termination
-  out((char)0, buffer, idx < maxlen ? idx : maxlen - 1U, maxlen);
-
-  // return written chars without terminating \0
-  return (int)idx;
-}
-
-
-///////////////////////////////////////////////////////////////////////////////
-
-int printf_(const char* format, ...)
-{
-  va_list va;
-  va_start(va, format);
-  char buffer[1];
-  const int ret = _vsnprintf(_out_char, buffer, (size_t)-1, format, va);
-  va_end(va);
-  return ret;
-}
-
-
-int sprintf_(char* buffer, const char* format, ...)
-{
-  va_list va;
-  va_start(va, format);
-  const int ret = _vsnprintf(_out_buffer, buffer, (size_t)-1, format, va);
-  va_end(va);
-  return ret;
-}
-
-
-int snprintf_(char* buffer, size_t count, const char* format, ...)
-{
-  va_list va;
-  va_start(va, format);
-  const int ret = _vsnprintf(_out_buffer, buffer, count, format, va);
-  va_end(va);
-  return ret;
-}
-
-
-int vprintf_(const char* format, va_list va)
-{
-  char buffer[1];
-  return _vsnprintf(_out_char, buffer, (size_t)-1, format, va);
-}
-
-
-int vsnprintf_(char* buffer, size_t count, const char* format, va_list va)
-{
-  return _vsnprintf(_out_buffer, buffer, count, format, va);
-}
-
-
-int fctprintf(void (*out)(char character, void* arg), void* arg, const char* format, ...)
-{
-  va_list va;
-  va_start(va, format);
-  const out_fct_wrap_type out_fct_wrap = { out, arg };
-  const int ret = _vsnprintf(_out_fct, (char*)(uintptr_t)&out_fct_wrap, (size_t)-1, format, va);
-  va_end(va);
-  return ret;
-}
+// ///////////////////////////////////////////////////////////////////////////////
+// // \author (c) Marco Paland (info@paland.com)
+// //             2014-2019, PALANDesign Hannover, Germany
+// //
+// // \license The MIT License (MIT)
+// //
+// // Permission is hereby granted, free of charge, to any person obtaining a copy
+// // of this software and associated documentation files (the "Software"), to deal
+// // in the Software without restriction, including without limitation the rights
+// // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// // copies of the Software, and to permit persons to whom the Software is
+// // furnished to do so, subject to the following conditions:
+// //
+// // The above copyright notice and this permission notice shall be included in
+// // all copies or substantial portions of the Software.
+// //
+// // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// // THE SOFTWARE.
+// //
+// // \brief Tiny printf, sprintf and (v)snprintf implementation, optimized for speed on
+// //        embedded systems with a very limited resources. These routines are thread
+// //        safe and reentrant!
+// //        Use this instead of the bloated standard/newlib printf cause these use
+// //        malloc for printf (and may not be thread safe).
+// //
+// ///////////////////////////////////////////////////////////////////////////////
+
+// #include <stdbool.h>
+// #include <stdint.h>
+
+// #include "printf.h"
+
+
+// // define this globally (e.g. gcc -DPRINTF_INCLUDE_CONFIG_H ...) to include the
+// // printf_config.h header file
+// // default: undefined
+// #ifdef PRINTF_INCLUDE_CONFIG_H
+// #include "printf_config.h"
+// #endif
+
+
+// // 'ntoa' conversion buffer size, this must be big enough to hold one converted
+// // numeric number including padded zeros (dynamically created on stack)
+// // default: 32 byte
+// #ifndef PRINTF_NTOA_BUFFER_SIZE
+// #define PRINTF_NTOA_BUFFER_SIZE    32U
+// #endif
+
+// // 'ftoa' conversion buffer size, this must be big enough to hold one converted
+// // float number including padded zeros (dynamically created on stack)
+// // default: 32 byte
+// #ifndef PRINTF_FTOA_BUFFER_SIZE
+// #define PRINTF_FTOA_BUFFER_SIZE    32U
+// #endif
+
+// // support for the floating point type (%f)
+// // default: activated
+// #ifndef PRINTF_DISABLE_SUPPORT_FLOAT
+// #define PRINTF_SUPPORT_FLOAT
+// #endif
+
+// // support for exponential floating point notation (%e/%g)
+// // default: activated
+// #ifndef PRINTF_DISABLE_SUPPORT_EXPONENTIAL
+// #define PRINTF_SUPPORT_EXPONENTIAL
+// #endif
+
+// // define the default floating point precision
+// // default: 6 digits
+// #ifndef PRINTF_DEFAULT_FLOAT_PRECISION
+// #define PRINTF_DEFAULT_FLOAT_PRECISION  6U
+// #endif
+
+// // define the largest float suitable to print with %f
+// // default: 1e9
+// #ifndef PRINTF_MAX_FLOAT
+// #define PRINTF_MAX_FLOAT  1e9
+// #endif
+
+// // support for the long long types (%llu or %p)
+// // default: activated
+// #ifndef PRINTF_DISABLE_SUPPORT_LONG_LONG
+// #define PRINTF_SUPPORT_LONG_LONG
+// #endif
+
+// // support for the ptrdiff_t type (%t)
+// // ptrdiff_t is normally defined in <stddef.h> as long or long long type
+// // default: activated
+// #ifndef PRINTF_DISABLE_SUPPORT_PTRDIFF_T
+// #define PRINTF_SUPPORT_PTRDIFF_T
+// #endif
+
+// ///////////////////////////////////////////////////////////////////////////////
+
+// // internal flag definitions
+// #define FLAGS_ZEROPAD   (1U <<  0U)
+// #define FLAGS_LEFT      (1U <<  1U)
+// #define FLAGS_PLUS      (1U <<  2U)
+// #define FLAGS_SPACE     (1U <<  3U)
+// #define FLAGS_HASH      (1U <<  4U)
+// #define FLAGS_UPPERCASE (1U <<  5U)
+// #define FLAGS_CHAR      (1U <<  6U)
+// #define FLAGS_SHORT     (1U <<  7U)
+// #define FLAGS_LONG      (1U <<  8U)
+// #define FLAGS_LONG_LONG (1U <<  9U)
+// #define FLAGS_PRECISION (1U << 10U)
+// #define FLAGS_ADAPT_EXP (1U << 11U)
+
+
+// // import float.h for DBL_MAX
+// #if defined(PRINTF_SUPPORT_FLOAT)
+// #include <float.h>
+// #endif
+
+
+// // output function type
+// typedef void (*out_fct_type)(char character, void* buffer, size_t idx, size_t maxlen);
+
+
+// // wrapper (used as buffer) for output function type
+// typedef struct {
+//   void  (*fct)(char character, void* arg);
+//   void* arg;
+// } out_fct_wrap_type;
+
+
+// // internal buffer output
+// static inline void _out_buffer(char character, void* buffer, size_t idx, size_t maxlen)
+// {
+//   if (idx < maxlen) {
+//     ((char*)buffer)[idx] = character;
+//   }
+// }
+
+
+// // internal null output
+// static inline void _out_null(char character, void* buffer, size_t idx, size_t maxlen)
+// {
+//   (void)character; (void)buffer; (void)idx; (void)maxlen;
+// }
+
+
+// // internal _putchar wrapper
+// static inline void _out_char(char character, void* buffer, size_t idx, size_t maxlen)
+// {
+//   (void)buffer; (void)idx; (void)maxlen;
+//   if (character) {
+//     _putchar(character);
+//   }
+// }
+
+
+// // internal output function wrapper
+// static inline void _out_fct(char character, void* buffer, size_t idx, size_t maxlen)
+// {
+//   (void)idx; (void)maxlen;
+//   if (character) {
+//     // buffer is the output fct pointer
+//     ((out_fct_wrap_type*)buffer)->fct(character, ((out_fct_wrap_type*)buffer)->arg);
+//   }
+// }
+
+
+// // internal secure strlen
+// // \return The length of the string (excluding the terminating 0) limited by 'maxsize'
+// static inline unsigned int _strnlen_s(const char* str, size_t maxsize)
+// {
+//   const char* s;
+//   for (s = str; *s && maxsize--; ++s);
+//   return (unsigned int)(s - str);
+// }
+
+
+// // internal test if char is a digit (0-9)
+// // \return true if char is a digit
+// static inline bool _is_digit(char ch)
+// {
+//   return (ch >= '0') && (ch <= '9');
+// }
+
+
+// // internal ASCII string to unsigned int conversion
+// static unsigned int _atoi(const char** str)
+// {
+//   unsigned int i = 0U;
+//   while (_is_digit(**str)) {
+//     i = i * 10U + (unsigned int)(*((*str)++) - '0');
+//   }
+//   return i;
+// }
+
+
+// // output the specified string in reverse, taking care of any zero-padding
+// static size_t _out_rev(out_fct_type out, char* buffer, size_t idx, size_t maxlen, const char* buf, size_t len, unsigned int width, unsigned int flags)
+// {
+//   const size_t start_idx = idx;
+
+//   // pad spaces up to given width
+//   if (!(flags & FLAGS_LEFT) && !(flags & FLAGS_ZEROPAD)) {
+//     for (size_t i = len; i < width; i++) {
+//       out(' ', buffer, idx++, maxlen);
+//     }
+//   }
+
+//   // reverse string
+//   while (len) {
+//     out(buf[--len], buffer, idx++, maxlen);
+//   }
+
+//   // append pad spaces up to given width
+//   if (flags & FLAGS_LEFT) {
+//     while (idx - start_idx < width) {
+//       out(' ', buffer, idx++, maxlen);
+//     }
+//   }
+
+//   return idx;
+// }
+
+
+// // internal itoa format
+// static size_t _ntoa_format(out_fct_type out, char* buffer, size_t idx, size_t maxlen, char* buf, size_t len, bool negative, unsigned int base, unsigned int prec, unsigned int width, unsigned int flags)
+// {
+//   // pad leading zeros
+//   if (!(flags & FLAGS_LEFT)) {
+//     if (width && (flags & FLAGS_ZEROPAD) && (negative || (flags & (FLAGS_PLUS | FLAGS_SPACE)))) {
+//       width--;
+//     }
+//     while ((len < prec) && (len < PRINTF_NTOA_BUFFER_SIZE)) {
+//       buf[len++] = '0';
+//     }
+//     while ((flags & FLAGS_ZEROPAD) && (len < width) && (len < PRINTF_NTOA_BUFFER_SIZE)) {
+//       buf[len++] = '0';
+//     }
+//   }
+
+//   // handle hash
+//   if (flags & FLAGS_HASH) {
+//     if (!(flags & FLAGS_PRECISION) && len && ((len == prec) || (len == width))) {
+//       len--;
+//       if (len && (base == 16U)) {
+//         len--;
+//       }
+//     }
+//     if ((base == 16U) && !(flags & FLAGS_UPPERCASE) && (len < PRINTF_NTOA_BUFFER_SIZE)) {
+//       buf[len++] = 'x';
+//     }
+//     else if ((base == 16U) && (flags & FLAGS_UPPERCASE) && (len < PRINTF_NTOA_BUFFER_SIZE)) {
+//       buf[len++] = 'X';
+//     }
+//     else if ((base == 2U) && (len < PRINTF_NTOA_BUFFER_SIZE)) {
+//       buf[len++] = 'b';
+//     }
+//     if (len < PRINTF_NTOA_BUFFER_SIZE) {
+//       buf[len++] = '0';
+//     }
+//   }
+
+//   if (len < PRINTF_NTOA_BUFFER_SIZE) {
+//     if (negative) {
+//       buf[len++] = '-';
+//     }
+//     else if (flags & FLAGS_PLUS) {
+//       buf[len++] = '+';  // ignore the space if the '+' exists
+//     }
+//     else if (flags & FLAGS_SPACE) {
+//       buf[len++] = ' ';
+//     }
+//   }
+
+//   return _out_rev(out, buffer, idx, maxlen, buf, len, width, flags);
+// }
+
+
+// // internal itoa for 'long' type
+// static size_t _ntoa_long(out_fct_type out, char* buffer, size_t idx, size_t maxlen, unsigned long value, bool negative, unsigned long base, unsigned int prec, unsigned int width, unsigned int flags)
+// {
+//   char buf[PRINTF_NTOA_BUFFER_SIZE];
+//   size_t len = 0U;
+
+//   // no hash for 0 values
+//   if (!value) {
+//     flags &= ~FLAGS_HASH;
+//   }
+
+//   // write if precision != 0 and value is != 0
+//   if (!(flags & FLAGS_PRECISION) || value) {
+//     do {
+//       const char digit = (char)(value % base);
+//       buf[len++] = digit < 10 ? '0' + digit : (flags & FLAGS_UPPERCASE ? 'A' : 'a') + digit - 10;
+//       value /= base;
+//     } while (value && (len < PRINTF_NTOA_BUFFER_SIZE));
+//   }
+
+//   return _ntoa_format(out, buffer, idx, maxlen, buf, len, negative, (unsigned int)base, prec, width, flags);
+// }
+
+
+// // internal itoa for 'long long' type
+// #if defined(PRINTF_SUPPORT_LONG_LONG)
+// static size_t _ntoa_long_long(out_fct_type out, char* buffer, size_t idx, size_t maxlen, unsigned long long value, bool negative, unsigned long long base, unsigned int prec, unsigned int width, unsigned int flags)
+// {
+//   char buf[PRINTF_NTOA_BUFFER_SIZE];
+//   size_t len = 0U;
+
+//   // no hash for 0 values
+//   if (!value) {
+//     flags &= ~FLAGS_HASH;
+//   }
+
+//   // write if precision != 0 and value is != 0
+//   if (!(flags & FLAGS_PRECISION) || value) {
+//     do {
+//       const char digit = (char)(value % base);
+//       buf[len++] = digit < 10 ? '0' + digit : (flags & FLAGS_UPPERCASE ? 'A' : 'a') + digit - 10;
+//       value /= base;
+//     } while (value && (len < PRINTF_NTOA_BUFFER_SIZE));
+//   }
+
+//   return _ntoa_format(out, buffer, idx, maxlen, buf, len, negative, (unsigned int)base, prec, width, flags);
+// }
+// #endif  // PRINTF_SUPPORT_LONG_LONG
+
+
+// #if defined(PRINTF_SUPPORT_FLOAT)
+
+// #if defined(PRINTF_SUPPORT_EXPONENTIAL)
+// // forward declaration so that _ftoa can switch to exp notation for values > PRINTF_MAX_FLOAT
+// static size_t _etoa(out_fct_type out, char* buffer, size_t idx, size_t maxlen, double value, unsigned int prec, unsigned int width, unsigned int flags);
+// #endif
+
+
+// // internal ftoa for fixed decimal floating point
+// static size_t _ftoa(out_fct_type out, char* buffer, size_t idx, size_t maxlen, double value, unsigned int prec, unsigned int width, unsigned int flags)
+// {
+//   char buf[PRINTF_FTOA_BUFFER_SIZE];
+//   size_t len  = 0U;
+//   double diff = 0.0;
+
+//   // powers of 10
+//   static const double pow10[] = { 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 100000000, 1000000000 };
+
+//   // test for special values
+//   if (value != value)
+//     return _out_rev(out, buffer, idx, maxlen, "nan", 3, width, flags);
+//   if (value < -DBL_MAX)
+//     return _out_rev(out, buffer, idx, maxlen, "fni-", 4, width, flags);
+//   if (value > DBL_MAX)
+//     return _out_rev(out, buffer, idx, maxlen, (flags & FLAGS_PLUS) ? "fni+" : "fni", (flags & FLAGS_PLUS) ? 4U : 3U, width, flags);
+
+//   // test for very large values
+//   // standard printf behavior is to print EVERY whole number digit -- which could be 100s of characters overflowing your buffers == bad
+//   if ((value > PRINTF_MAX_FLOAT) || (value < -PRINTF_MAX_FLOAT)) {
+// #if defined(PRINTF_SUPPORT_EXPONENTIAL)
+//     return _etoa(out, buffer, idx, maxlen, value, prec, width, flags);
+// #else
+//     return 0U;
+// #endif
+//   }
+
+//   // test for negative
+//   bool negative = false;
+//   if (value < 0) {
+//     negative = true;
+//     value = 0 - value;
+//   }
+
+//   // set default precision, if not set explicitly
+//   if (!(flags & FLAGS_PRECISION)) {
+//     prec = PRINTF_DEFAULT_FLOAT_PRECISION;
+//   }
+//   // limit precision to 9, cause a prec >= 10 can lead to overflow errors
+//   while ((len < PRINTF_FTOA_BUFFER_SIZE) && (prec > 9U)) {
+//     buf[len++] = '0';
+//     prec--;
+//   }
+
+//   int whole = (int)value;
+//   double tmp = (value - whole) * pow10[prec];
+//   unsigned long frac = (unsigned long)tmp;
+//   diff = tmp - frac;
+
+//   if (diff > 0.5) {
+//     ++frac;
+//     // handle rollover, e.g. case 0.99 with prec 1 is 1.0
+//     if (frac >= pow10[prec]) {
+//       frac = 0;
+//       ++whole;
+//     }
+//   }
+//   else if (diff < 0.5) {
+//   }
+//   else if ((frac == 0U) || (frac & 1U)) {
+//     // if halfway, round up if odd OR if last digit is 0
+//     ++frac;
+//   }
+
+//   if (prec == 0U) {
+//     diff = value - (double)whole;
+//     if ((!(diff < 0.5) || (diff > 0.5)) && (whole & 1)) {
+//       // exactly 0.5 and ODD, then round up
+//       // 1.5 -> 2, but 2.5 -> 2
+//       ++whole;
+//     }
+//   }
+//   else {
+//     unsigned int count = prec;
+//     // now do fractional part, as an unsigned number
+//     while (len < PRINTF_FTOA_BUFFER_SIZE) {
+//       --count;
+//       buf[len++] = (char)(48U + (frac % 10U));
+//       if (!(frac /= 10U)) {
+//         break;
+//       }
+//     }
+//     // add extra 0s
+//     while ((len < PRINTF_FTOA_BUFFER_SIZE) && (count-- > 0U)) {
+//       buf[len++] = '0';
+//     }
+//     if (len < PRINTF_FTOA_BUFFER_SIZE) {
+//       // add decimal
+//       buf[len++] = '.';
+//     }
+//   }
+
+//   // do whole part, number is reversed
+//   while (len < PRINTF_FTOA_BUFFER_SIZE) {
+//     buf[len++] = (char)(48 + (whole % 10));
+//     if (!(whole /= 10)) {
+//       break;
+//     }
+//   }
+
+//   // pad leading zeros
+//   if (!(flags & FLAGS_LEFT) && (flags & FLAGS_ZEROPAD)) {
+//     if (width && (negative || (flags & (FLAGS_PLUS | FLAGS_SPACE)))) {
+//       width--;
+//     }
+//     while ((len < width) && (len < PRINTF_FTOA_BUFFER_SIZE)) {
+//       buf[len++] = '0';
+//     }
+//   }
+
+//   if (len < PRINTF_FTOA_BUFFER_SIZE) {
+//     if (negative) {
+//       buf[len++] = '-';
+//     }
+//     else if (flags & FLAGS_PLUS) {
+//       buf[len++] = '+';  // ignore the space if the '+' exists
+//     }
+//     else if (flags & FLAGS_SPACE) {
+//       buf[len++] = ' ';
+//     }
+//   }
+
+//   return _out_rev(out, buffer, idx, maxlen, buf, len, width, flags);
+// }
+
+
+// #if defined(PRINTF_SUPPORT_EXPONENTIAL)
+// // internal ftoa variant for exponential floating-point type, contributed by Martijn Jasperse <m.jasperse@gmail.com>
+// static size_t _etoa(out_fct_type out, char* buffer, size_t idx, size_t maxlen, double value, unsigned int prec, unsigned int width, unsigned int flags)
+// {
+//   // check for NaN and special values
+//   if ((value != value) || (value > DBL_MAX) || (value < -DBL_MAX)) {
+//     return _ftoa(out, buffer, idx, maxlen, value, prec, width, flags);
+//   }
+
+//   // determine the sign
+//   const bool negative = value < 0;
+//   if (negative) {
+//     value = -value;
+//   }
+
+//   // default precision
+//   if (!(flags & FLAGS_PRECISION)) {
+//     prec = PRINTF_DEFAULT_FLOAT_PRECISION;
+//   }
+
+//   // determine the decimal exponent
+//   // based on the algorithm by David Gay (https://www.ampl.com/netlib/fp/dtoa.c)
+//   union {
+//     uint64_t U;
+//     double   F;
+//   } conv;
+
+//   conv.F = value;
+//   int exp2 = (int)((conv.U >> 52U) & 0x07FFU) - 1023;           // effectively log2
+//   conv.U = (conv.U & ((1ULL << 52U) - 1U)) | (1023ULL << 52U);  // drop the exponent so conv.F is now in [1,2)
+//   // now approximate log10 from the log2 integer part and an expansion of ln around 1.5
+//   int expval = (int)(0.1760912590558 + exp2 * 0.301029995663981 + (conv.F - 1.5) * 0.289529654602168);
+//   // now we want to compute 10^expval but we want to be sure it won't overflow
+//   exp2 = (int)(expval * 3.321928094887362 + 0.5);
+//   const double z  = expval * 2.302585092994046 - exp2 * 0.6931471805599453;
+//   const double z2 = z * z;
+//   conv.U = (uint64_t)(exp2 + 1023) << 52U;
+//   // compute exp(z) using continued fractions, see https://en.wikipedia.org/wiki/Exponential_function#Continued_fractions_for_ex
+//   conv.F *= 1 + 2 * z / (2 - z + (z2 / (6 + (z2 / (10 + z2 / 14)))));
+//   // correct for rounding errors
+//   if (value < conv.F) {
+//     expval--;
+//     conv.F /= 10;
+//   }
+
+//   // the exponent format is "%+03d" and largest value is "307", so set aside 4-5 characters
+//   unsigned int minwidth = ((expval < 100) && (expval > -100)) ? 4U : 5U;
+
+//   // in "%g" mode, "prec" is the number of *significant figures* not decimals
+//   if (flags & FLAGS_ADAPT_EXP) {
+//     // do we want to fall-back to "%f" mode?
+//     if ((value >= 1e-4) && (value < 1e6)) {
+//       if ((int)prec > expval) {
+//         prec = (unsigned)((int)prec - expval - 1);
+//       }
+//       else {
+//         prec = 0;
+//       }
+//       flags |= FLAGS_PRECISION;   // make sure _ftoa respects precision
+//       // no characters in exponent
+//       minwidth = 0U;
+//       expval   = 0;
+//     }
+//     else {
+//       // we use one sigfig for the whole part
+//       if ((prec > 0) && (flags & FLAGS_PRECISION)) {
+//         --prec;
+//       }
+//     }
+//   }
+
+//   // will everything fit?
+//   unsigned int fwidth = width;
+//   if (width > minwidth) {
+//     // we didn't fall-back so subtract the characters required for the exponent
+//     fwidth -= minwidth;
+//   } else {
+//     // not enough characters, so go back to default sizing
+//     fwidth = 0U;
+//   }
+//   if ((flags & FLAGS_LEFT) && minwidth) {
+//     // if we're padding on the right, DON'T pad the floating part
+//     fwidth = 0U;
+//   }
+
+//   // rescale the float value
+//   if (expval) {
+//     value /= conv.F;
+//   }
+
+//   // output the floating part
+//   const size_t start_idx = idx;
+//   idx = _ftoa(out, buffer, idx, maxlen, negative ? -value : value, prec, fwidth, flags & ~FLAGS_ADAPT_EXP);
+
+//   // output the exponent part
+//   if (minwidth) {
+//     // output the exponential symbol
+//     out((flags & FLAGS_UPPERCASE) ? 'E' : 'e', buffer, idx++, maxlen);
+//     // output the exponent value
+//     idx = _ntoa_long(out, buffer, idx, maxlen, (expval < 0) ? -expval : expval, expval < 0, 10, 0, minwidth-1, FLAGS_ZEROPAD | FLAGS_PLUS);
+//     // might need to right-pad spaces
+//     if (flags & FLAGS_LEFT) {
+//       while (idx - start_idx < width) out(' ', buffer, idx++, maxlen);
+//     }
+//   }
+//   return idx;
+// }
+// #endif  // PRINTF_SUPPORT_EXPONENTIAL
+// #endif  // PRINTF_SUPPORT_FLOAT
+
+
+// // internal vsnprintf
+// static int _vsnprintf(out_fct_type out, char* buffer, const size_t maxlen, const char* format, va_list va)
+// {
+//   unsigned int flags, width, precision, n;
+//   size_t idx = 0U;
+
+//   if (!buffer) {
+//     // use null output function
+//     out = _out_null;
+//   }
+
+//   while (*format)
+//   {
+//     // format specifier?  %[flags][width][.precision][length]
+//     if (*format != '%') {
+//       // no
+//       out(*format, buffer, idx++, maxlen);
+//       format++;
+//       continue;
+//     }
+//     else {
+//       // yes, evaluate it
+//       format++;
+//     }
+
+//     // evaluate flags
+//     flags = 0U;
+//     do {
+//       switch (*format) {
+//         case '0': flags |= FLAGS_ZEROPAD; format++; n = 1U; break;
+//         case '-': flags |= FLAGS_LEFT;    format++; n = 1U; break;
+//         case '+': flags |= FLAGS_PLUS;    format++; n = 1U; break;
+//         case ' ': flags |= FLAGS_SPACE;   format++; n = 1U; break;
+//         case '#': flags |= FLAGS_HASH;    format++; n = 1U; break;
+//         default :                                   n = 0U; break;
+//       }
+//     } while (n);
+
+//     // evaluate width field
+//     width = 0U;
+//     if (_is_digit(*format)) {
+//       width = _atoi(&format);
+//     }
+//     else if (*format == '*') {
+//       const int w = va_arg(va, int);
+//       if (w < 0) {
+//         flags |= FLAGS_LEFT;    // reverse padding
+//         width = (unsigned int)-w;
+//       }
+//       else {
+//         width = (unsigned int)w;
+//       }
+//       format++;
+//     }
+
+//     // evaluate precision field
+//     precision = 0U;
+//     if (*format == '.') {
+//       flags |= FLAGS_PRECISION;
+//       format++;
+//       if (_is_digit(*format)) {
+//         precision = _atoi(&format);
+//       }
+//       else if (*format == '*') {
+//         const int prec = (int)va_arg(va, int);
+//         precision = prec > 0 ? (unsigned int)prec : 0U;
+//         format++;
+//       }
+//     }
+
+//     // evaluate length field
+//     switch (*format) {
+//       case 'l' :
+//         flags |= FLAGS_LONG;
+//         format++;
+//         if (*format == 'l') {
+//           flags |= FLAGS_LONG_LONG;
+//           format++;
+//         }
+//         break;
+//       case 'h' :
+//         flags |= FLAGS_SHORT;
+//         format++;
+//         if (*format == 'h') {
+//           flags |= FLAGS_CHAR;
+//           format++;
+//         }
+//         break;
+// #if defined(PRINTF_SUPPORT_PTRDIFF_T)
+//       case 't' :
+//         flags |= (sizeof(ptrdiff_t) == sizeof(long) ? FLAGS_LONG : FLAGS_LONG_LONG);
+//         format++;
+//         break;
+// #endif
+//       case 'j' :
+//         flags |= (sizeof(intmax_t) == sizeof(long) ? FLAGS_LONG : FLAGS_LONG_LONG);
+//         format++;
+//         break;
+//       case 'z' :
+//         flags |= (sizeof(size_t) == sizeof(long) ? FLAGS_LONG : FLAGS_LONG_LONG);
+//         format++;
+//         break;
+//       default :
+//         break;
+//     }
+
+//     // evaluate specifier
+//     switch (*format) {
+//       case 'd' :
+//       case 'i' :
+//       case 'u' :
+//       case 'x' :
+//       case 'X' :
+//       case 'o' :
+//       case 'b' : {
+//         // set the base
+//         unsigned int base;
+//         if (*format == 'x' || *format == 'X') {
+//           base = 16U;
+//         }
+//         else if (*format == 'o') {
+//           base =  8U;
+//         }
+//         else if (*format == 'b') {
+//           base =  2U;
+//         }
+//         else {
+//           base = 10U;
+//           flags &= ~FLAGS_HASH;   // no hash for dec format
+//         }
+//         // uppercase
+//         if (*format == 'X') {
+//           flags |= FLAGS_UPPERCASE;
+//         }
+
+//         // no plus or space flag for u, x, X, o, b
+//         if ((*format != 'i') && (*format != 'd')) {
+//           flags &= ~(FLAGS_PLUS | FLAGS_SPACE);
+//         }
+
+//         // ignore '0' flag when precision is given
+//         if (flags & FLAGS_PRECISION) {
+//           flags &= ~FLAGS_ZEROPAD;
+//         }
+
+//         // convert the integer
+//         if ((*format == 'i') || (*format == 'd')) {
+//           // signed
+//           if (flags & FLAGS_LONG_LONG) {
+// #if defined(PRINTF_SUPPORT_LONG_LONG)
+//             const long long value = va_arg(va, long long);
+//             idx = _ntoa_long_long(out, buffer, idx, maxlen, (unsigned long long)(value > 0 ? value : 0 - value), value < 0, base, precision, width, flags);
+// #endif
+//           }
+//           else if (flags & FLAGS_LONG) {
+//             const long value = va_arg(va, long);
+//             idx = _ntoa_long(out, buffer, idx, maxlen, (unsigned long)(value > 0 ? value : 0 - value), value < 0, base, precision, width, flags);
+//           }
+//           else {
+//             const int value = (flags & FLAGS_CHAR) ? (char)va_arg(va, int) : (flags & FLAGS_SHORT) ? (short int)va_arg(va, int) : va_arg(va, int);
+//             idx = _ntoa_long(out, buffer, idx, maxlen, (unsigned int)(value > 0 ? value : 0 - value), value < 0, base, precision, width, flags);
+//           }
+//         }
+//         else {
+//           // unsigned
+//           if (flags & FLAGS_LONG_LONG) {
+// #if defined(PRINTF_SUPPORT_LONG_LONG)
+//             idx = _ntoa_long_long(out, buffer, idx, maxlen, va_arg(va, unsigned long long), false, base, precision, width, flags);
+// #endif
+//           }
+//           else if (flags & FLAGS_LONG) {
+//             idx = _ntoa_long(out, buffer, idx, maxlen, va_arg(va, unsigned long), false, base, precision, width, flags);
+//           }
+//           else {
+//             const unsigned int value = (flags & FLAGS_CHAR) ? (unsigned char)va_arg(va, unsigned int) : (flags & FLAGS_SHORT) ? (unsigned short int)va_arg(va, unsigned int) : va_arg(va, unsigned int);
+//             idx = _ntoa_long(out, buffer, idx, maxlen, value, false, base, precision, width, flags);
+//           }
+//         }
+//         format++;
+//         break;
+//       }
+// #if defined(PRINTF_SUPPORT_FLOAT)
+//       case 'f' :
+//       case 'F' :
+//         if (*format == 'F') flags |= FLAGS_UPPERCASE;
+//         idx = _ftoa(out, buffer, idx, maxlen, va_arg(va, double), precision, width, flags);
+//         format++;
+//         break;
+// #if defined(PRINTF_SUPPORT_EXPONENTIAL)
+//       case 'e':
+//       case 'E':
+//       case 'g':
+//       case 'G':
+//         if ((*format == 'g')||(*format == 'G')) flags |= FLAGS_ADAPT_EXP;
+//         if ((*format == 'E')||(*format == 'G')) flags |= FLAGS_UPPERCASE;
+//         idx = _etoa(out, buffer, idx, maxlen, va_arg(va, double), precision, width, flags);
+//         format++;
+//         break;
+// #endif  // PRINTF_SUPPORT_EXPONENTIAL
+// #endif  // PRINTF_SUPPORT_FLOAT
+//       case 'c' : {
+//         unsigned int l = 1U;
+//         // pre padding
+//         if (!(flags & FLAGS_LEFT)) {
+//           while (l++ < width) {
+//             out(' ', buffer, idx++, maxlen);
+//           }
+//         }
+//         // char output
+//         out((char)va_arg(va, int), buffer, idx++, maxlen);
+//         // post padding
+//         if (flags & FLAGS_LEFT) {
+//           while (l++ < width) {
+//             out(' ', buffer, idx++, maxlen);
+//           }
+//         }
+//         format++;
+//         break;
+//       }
+
+//       case 's' : {
+//         const char* p = va_arg(va, char*);
+//         unsigned int l = _strnlen_s(p, precision ? precision : (size_t)-1);
+//         // pre padding
+//         if (flags & FLAGS_PRECISION) {
+//           l = (l < precision ? l : precision);
+//         }
+//         if (!(flags & FLAGS_LEFT)) {
+//           while (l++ < width) {
+//             out(' ', buffer, idx++, maxlen);
+//           }
+//         }
+//         // string output
+//         while ((*p != 0) && (!(flags & FLAGS_PRECISION) || precision--)) {
+//           out(*(p++), buffer, idx++, maxlen);
+//         }
+//         // post padding
+//         if (flags & FLAGS_LEFT) {
+//           while (l++ < width) {
+//             out(' ', buffer, idx++, maxlen);
+//           }
+//         }
+//         format++;
+//         break;
+//       }
+
+//       case 'p' : {
+//         width = sizeof(void*) * 2U;
+//         flags |= FLAGS_ZEROPAD | FLAGS_UPPERCASE;
+// #if defined(PRINTF_SUPPORT_LONG_LONG)
+//         const bool is_ll = sizeof(uintptr_t) == sizeof(long long);
+//         if (is_ll) {
+//           idx = _ntoa_long_long(out, buffer, idx, maxlen, (uintptr_t)va_arg(va, void*), false, 16U, precision, width, flags);
+//         }
+//         else {
+// #endif
+//           idx = _ntoa_long(out, buffer, idx, maxlen, (unsigned long)((uintptr_t)va_arg(va, void*)), false, 16U, precision, width, flags);
+// #if defined(PRINTF_SUPPORT_LONG_LONG)
+//         }
+// #endif
+//         format++;
+//         break;
+//       }
+
+//       case '%' :
+//         out('%', buffer, idx++, maxlen);
+//         format++;
+//         break;
+
+//       default :
+//         out(*format, buffer, idx++, maxlen);
+//         format++;
+//         break;
+//     }
+//   }
+
+//   // termination
+//   out((char)0, buffer, idx < maxlen ? idx : maxlen - 1U, maxlen);
+
+//   // return written chars without terminating \0
+//   return (int)idx;
+// }
+
+
+// ///////////////////////////////////////////////////////////////////////////////
+
+// int printf_(const char* format, ...)
+// {
+//   va_list va;
+//   va_start(va, format);
+//   char buffer[1];
+//   const int ret = _vsnprintf(_out_char, buffer, (size_t)-1, format, va);
+//   va_end(va);
+//   return ret;
+// }
+
+
+// int sprintf_(char* buffer, const char* format, ...)
+// {
+//   va_list va;
+//   va_start(va, format);
+//   const int ret = _vsnprintf(_out_buffer, buffer, (size_t)-1, format, va);
+//   va_end(va);
+//   return ret;
+// }
+
+
+// int snprintf_(char* buffer, size_t count, const char* format, ...)
+// {
+//   va_list va;
+//   va_start(va, format);
+//   const int ret = _vsnprintf(_out_buffer, buffer, count, format, va);
+//   va_end(va);
+//   return ret;
+// }
+
+
+// int vprintf_(const char* format, va_list va)
+// {
+//   char buffer[1];
+//   return _vsnprintf(_out_char, buffer, (size_t)-1, format, va);
+// }
+
+
+// int vsnprintf_(char* buffer, size_t count, const char* format, va_list va)
+// {
+//   return _vsnprintf(_out_buffer, buffer, count, format, va);
+// }
+
+
+// int fctprintf(void (*out)(char character, void* arg), void* arg, const char* format, ...)
+// {
+//   va_list va;
+//   va_start(va, format);
+//   const out_fct_wrap_type out_fct_wrap = { out, arg };
+//   const int ret = _vsnprintf(_out_fct, (char*)(uintptr_t)&out_fct_wrap, (size_t)-1, format, va);
+//   va_end(va);
+//   return ret;
+// }

helpers/printf.h

@@ -1,117 +1,117 @@
-///////////////////////////////////////////////////////////////////////////////
-// \author (c) Marco Paland (info@paland.com)
-//             2014-2019, PALANDesign Hannover, Germany
-//
-// \license The MIT License (MIT)
-//
-// Permission is hereby granted, free of charge, to any person obtaining a copy
-// of this software and associated documentation files (the "Software"), to deal
-// in the Software without restriction, including without limitation the rights
-// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-// copies of the Software, and to permit persons to whom the Software is
-// furnished to do so, subject to the following conditions:
-// 
-// The above copyright notice and this permission notice shall be included in
-// all copies or substantial portions of the Software.
-// 
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-// THE SOFTWARE.
-//
-// \brief Tiny printf, sprintf and snprintf implementation, optimized for speed on
-//        embedded systems with a very limited resources.
-//        Use this instead of bloated standard/newlib printf.
-//        These routines are thread safe and reentrant.
-//
-///////////////////////////////////////////////////////////////////////////////
-
-#ifndef _PRINTF_H_
-#define _PRINTF_H_
-
-#include <stdarg.h>
-#include <stddef.h>
-
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-
-/**
- * Output a character to a custom device like UART, used by the printf() function
- * This function is declared here only. You have to write your custom implementation somewhere
- * \param character Character to output
- */
-void _putchar(char character);
-
-
-/**
- * Tiny printf implementation
- * You have to implement _putchar if you use printf()
- * To avoid conflicts with the regular printf() API it is overridden by macro defines
- * and internal underscore-appended functions like printf_() are used
- * \param format A string that specifies the format of the output
- * \return The number of characters that are written into the array, not counting the terminating null character
- */
-#define printf printf_
-int printf_(const char* format, ...);
-
-
-/**
- * Tiny sprintf implementation
- * Due to security reasons (buffer overflow) YOU SHOULD CONSIDER USING (V)SNPRINTF INSTEAD!
- * \param buffer A pointer to the buffer where to store the formatted string. MUST be big enough to store the output!
- * \param format A string that specifies the format of the output
- * \return The number of characters that are WRITTEN into the buffer, not counting the terminating null character
- */
-#define sprintf sprintf_
-int sprintf_(char* buffer, const char* format, ...);
-
-
-/**
- * Tiny snprintf/vsnprintf implementation
- * \param buffer A pointer to the buffer where to store the formatted string
- * \param count The maximum number of characters to store in the buffer, including a terminating null character
- * \param format A string that specifies the format of the output
- * \param va A value identifying a variable arguments list
- * \return The number of characters that COULD have been written into the buffer, not counting the terminating
- *         null character. A value equal or larger than count indicates truncation. Only when the returned value
- *         is non-negative and less than count, the string has been completely written.
- */
-#define snprintf  snprintf_
-#define vsnprintf vsnprintf_
-int  snprintf_(char* buffer, size_t count, const char* format, ...);
-int vsnprintf_(char* buffer, size_t count, const char* format, va_list va);
-
-
-/**
- * Tiny vprintf implementation
- * \param format A string that specifies the format of the output
- * \param va A value identifying a variable arguments list
- * \return The number of characters that are WRITTEN into the buffer, not counting the terminating null character
- */
-#define vprintf vprintf_
-int vprintf_(const char* format, va_list va);
-
-
-/**
- * printf with output function
- * You may use this as dynamic alternative to printf() with its fixed _putchar() output
- * \param out An output function which takes one character and an argument pointer
- * \param arg An argument pointer for user data passed to output function
- * \param format A string that specifies the format of the output
- * \return The number of characters that are sent to the output function, not counting the terminating null character
- */
-int fctprintf(void (*out)(char character, void* arg), void* arg, const char* format, ...);
-
-
-#ifdef __cplusplus
-}
-#endif
-
-
-#endif  // _PRINTF_H_
+// ///////////////////////////////////////////////////////////////////////////////
+// // \author (c) Marco Paland (info@paland.com)
+// //             2014-2019, PALANDesign Hannover, Germany
+// //
+// // \license The MIT License (MIT)
+// //
+// // Permission is hereby granted, free of charge, to any person obtaining a copy
+// // of this software and associated documentation files (the "Software"), to deal
+// // in the Software without restriction, including without limitation the rights
+// // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// // copies of the Software, and to permit persons to whom the Software is
+// // furnished to do so, subject to the following conditions:
+// // 
+// // The above copyright notice and this permission notice shall be included in
+// // all copies or substantial portions of the Software.
+// // 
+// // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// // THE SOFTWARE.
+// //
+// // \brief Tiny printf, sprintf and snprintf implementation, optimized for speed on
+// //        embedded systems with a very limited resources.
+// //        Use this instead of bloated standard/newlib printf.
+// //        These routines are thread safe and reentrant.
+// //
+// ///////////////////////////////////////////////////////////////////////////////
+
+// #ifndef _PRINTF_H_
+// #define _PRINTF_H_
+
+// #include <stdarg.h>
+// #include <stddef.h>
+
+
+// #ifdef __cplusplus
+// extern "C" {
+// #endif
+
+
+// /**
+//  * Output a character to a custom device like UART, used by the printf() function
+//  * This function is declared here only. You have to write your custom implementation somewhere
+//  * \param character Character to output
+//  */
+// void _putchar(char character);
+
+
+// /**
+//  * Tiny printf implementation
+//  * You have to implement _putchar if you use printf()
+//  * To avoid conflicts with the regular printf() API it is overridden by macro defines
+//  * and internal underscore-appended functions like printf_() are used
+//  * \param format A string that specifies the format of the output
+//  * \return The number of characters that are written into the array, not counting the terminating null character
+//  */
+// #define printf printf_
+// int printf_(const char* format, ...);
+
+
+// /**
+//  * Tiny sprintf implementation
+//  * Due to security reasons (buffer overflow) YOU SHOULD CONSIDER USING (V)SNPRINTF INSTEAD!
+//  * \param buffer A pointer to the buffer where to store the formatted string. MUST be big enough to store the output!
+//  * \param format A string that specifies the format of the output
+//  * \return The number of characters that are WRITTEN into the buffer, not counting the terminating null character
+//  */
+// #define sprintf sprintf_
+// int sprintf_(char* buffer, const char* format, ...);
+
+
+// /**
+//  * Tiny snprintf/vsnprintf implementation
+//  * \param buffer A pointer to the buffer where to store the formatted string
+//  * \param count The maximum number of characters to store in the buffer, including a terminating null character
+//  * \param format A string that specifies the format of the output
+//  * \param va A value identifying a variable arguments list
+//  * \return The number of characters that COULD have been written into the buffer, not counting the terminating
+//  *         null character. A value equal or larger than count indicates truncation. Only when the returned value
+//  *         is non-negative and less than count, the string has been completely written.
+//  */
+// #define snprintf  snprintf_
+// #define vsnprintf vsnprintf_
+// int  snprintf_(char* buffer, size_t count, const char* format, ...);
+// int vsnprintf_(char* buffer, size_t count, const char* format, va_list va);
+
+
+// /**
+//  * Tiny vprintf implementation
+//  * \param format A string that specifies the format of the output
+//  * \param va A value identifying a variable arguments list
+//  * \return The number of characters that are WRITTEN into the buffer, not counting the terminating null character
+//  */
+// #define vprintf vprintf_
+// int vprintf_(const char* format, va_list va);
+
+
+// /**
+//  * printf with output function
+//  * You may use this as dynamic alternative to printf() with its fixed _putchar() output
+//  * \param out An output function which takes one character and an argument pointer
+//  * \param arg An argument pointer for user data passed to output function
+//  * \param format A string that specifies the format of the output
+//  * \return The number of characters that are sent to the output function, not counting the terminating null character
+//  */
+// int fctprintf(void (*out)(char character, void* arg), void* arg, const char* format, ...);
+
+
+// #ifdef __cplusplus
+// }
+// #endif
+
+
+// #endif  // _PRINTF_H_

scenes/flipbip_scene_settings.c

@@ -17,14 +17,14 @@ const uint32_t haptic_value[2] = {
     FlipBipHapticOn,
 };
 
-const char* const speaker_text[2] = {
-    "OFF",
-    "ON",
-};
-const uint32_t speaker_value[2] = {
-    FlipBipSpeakerOff,
-    FlipBipSpeakerOn,
-};
+// const char* const speaker_text[2] = {
+//     "OFF",
+//     "ON",
+// };
+// const uint32_t speaker_value[2] = {
+//     FlipBipSpeakerOff,
+//     FlipBipSpeakerOn,
+// };
 
 const char* const led_text[2] = {
     "OFF",
@@ -53,12 +53,12 @@ static void flipbip_scene_settings_set_haptic(VariableItem* item) {
     app->haptic = haptic_value[index];
 }
 
-static void flipbip_scene_settings_set_speaker(VariableItem* item) {
-    FlipBip* app = variable_item_get_context(item);
-    uint8_t index = variable_item_get_current_value_index(item);
-    variable_item_set_current_value_text(item, speaker_text[index]);
-    app->speaker = speaker_value[index];
-}
+// static void flipbip_scene_settings_set_speaker(VariableItem* item) {
+//     FlipBip* app = variable_item_get_context(item);
+//     uint8_t index = variable_item_get_current_value_index(item);
+//     variable_item_set_current_value_text(item, speaker_text[index]);
+//     app->speaker = speaker_value[index];
+// }
 
 static void flipbip_scene_settings_set_led(VariableItem* item) {
     FlipBip* app = variable_item_get_context(item);
@@ -106,16 +106,16 @@ void flipbip_scene_settings_on_enter(void* context) {
     variable_item_set_current_value_index(item, value_index);
     variable_item_set_current_value_text(item, haptic_text[value_index]);
 
-    // Sound on/off
-    item = variable_item_list_add(
-        app->variable_item_list,
-        "Sound:",
-        2,
-        flipbip_scene_settings_set_speaker,
-        app);
-    value_index = value_index_uint32(app->speaker, speaker_value, 2);
-    variable_item_set_current_value_index(item, value_index);
-    variable_item_set_current_value_text(item, speaker_text[value_index]);
+    // // Sound on/off
+    // item = variable_item_list_add(
+    //     app->variable_item_list,
+    //     "Sound:",
+    //     2,
+    //     flipbip_scene_settings_set_speaker,
+    //     app);
+    // value_index = value_index_uint32(app->speaker, speaker_value, 2);
+    // variable_item_set_current_value_index(item, value_index);
+    // variable_item_set_current_value_text(item, speaker_text[value_index]);
 
     // LED Effects on/off
     item = variable_item_list_add(