Modified old firmware.

fap/views/camera_suite_view_camera.c

@@ -127,14 +127,6 @@ static void save_image(void* model) {
     // Free the file name after use.
     furi_string_free(file_name);
 
-    // @todo - Add functionaly for saving images inverted if necessary.
-    // Invert pixel values if necessary.
-    // if(!model->inverted) { }
-
-    for(size_t i = 0; i < FRAME_BUFFER_LENGTH; ++i) {
-        uartDumpModel->pixels[i] = ~uartDumpModel->pixels[i];
-    }
-
     // If the file was opened successfully, write the bitmap header and the
     // image data.
     if(result) {
@@ -218,7 +210,6 @@ static bool camera_suite_view_camera_input(InputEvent* event, void* context) {
                     camera_suite_play_happy_bump(instance->context);
                     camera_suite_play_input_sound(instance->context);
                     camera_suite_led_set_rgb(instance->context, 0, 0, 255);
-                    model->inverted = !model->inverted;
                     instance->callback(CameraSuiteCustomEventSceneCameraLeft, instance->context);
                 },
                 true);
@@ -332,15 +323,10 @@ static void camera_suite_view_camera_enter(void* context) {
     furi_hal_uart_tx(FuriHalUartIdUSART1, &dither_type, 1);
     furi_delay_ms(50);
 
-    uint32_t orientation = instance_context->orientation;
     with_view_model(
         instance->view,
         UartDumpModel * model,
-        {
-            model->inverted = false;
-            model->orientation = orientation;
-            camera_suite_view_camera_model_init(model);
-        },
+        { camera_suite_view_camera_model_init(model); },
         true);
 }
 

firmware/firmware.ino

@@ -1,6 +1,8 @@
-#include "FS.h"
-#include "esp_camera.h"
-#include "SD_MMC.h"
+#include <FS.h>
+#include <esp_camera.h>
+#include <stdint.h>
+
+// #include <SD_MMC.h>
 
 // Define Pin numbers used by the camera.
 #define FLASH_GPIO_NUM 4
@@ -10,9 +12,8 @@
 #define RESET_GPIO_NUM -1
 #define SIOC_GPIO_NUM 27
 #define SIOD_GPIO_NUM 26
-#define XCLK_GPIO_NUM 0
 #define VSYNC_GPIO_NUM 25
-
+#define XCLK_GPIO_NUM 0
 #define Y2_GPIO_NUM 5
 #define Y3_GPIO_NUM 18
 #define Y4_GPIO_NUM 19
@@ -22,381 +23,378 @@
 #define Y8_GPIO_NUM 34
 #define Y9_GPIO_NUM 35
 
-// Structure to hold the camera configuration parameters.
-camera_config_t config;
-
-// Function prototypes.
-void handleSerialInput();
-void initializeCamera();
-void processImage(camera_fb_t *frame_buffer);
-void ditherImage(camera_fb_t *frame_buffer);
-void saveJpegPictureToSDCard();
-
-// Enumeration to represent the available dithering algorithms.
-enum DitheringAlgorithm : uint8_t
-{
-  FLOYD_STEINBERG,
-  JARVIS_JUDICE_NINKE,
-  STUCKI
-};
-
-// Holds the currently selected dithering algorithm.
-DitheringAlgorithm ditherAlgorithm = FLOYD_STEINBERG;
+/** Initialize the camera model. */
+void initialize_camera();
 
-// Flag to enable or disable dithering.
-bool disableDithering = false;
+/** Dither the image using the selected algorithm. */
+void dither_image(camera_fb_t* frame_buffer);
 
-// Flag to invert pixel colors.
-bool invert = false;
+/** Process and send grayscale images back to the Flipper Zero. */
+void process_image(camera_fb_t* frame_buffer);
 
-// Flag to represent the flash state when saving pictures to the Flipper.
-bool isFlashEnabled = false;
+/** Handle the serial input commands coming from the Flipper Zero. */
+void process_serial_commands();
 
-// Flag to represent whether the image is rotated.
-bool rotated = false;
+/**
+ * Save the current picture to the onboard SD card.
+ * @todo - Future feature.
+ */
+// void save_picture_to_sd();
 
-// Flag to stop or start the stream.
-bool stopStream = false;
+/** Turn the flash off. */
+void toggle_flash_off();
+
+/** Turn the flash on. */
+void toggle_flash_on();
+
+/** The dithering algorithms available. */
+typedef enum {
+    FLOYD_STEINBERG,
+    JARVIS_JUDICE_NINKE,
+    STUCKI,
+} DitheringAlgorithm;
+
+/** Flag to enable or disable dithering. */
+bool isDitheringEnabled = true;
+/** Flag to represent the flash state when saving pictures to the Flipper. */
+bool isFlashEnabled = false;
+/** Flag to invert pixel colors. */
+bool isInvertEnabled = false;
+/** Flag to stop or start the stream. */
+bool isStreamEnabled = true;
+/** Holds the current camera configuration. */
+camera_config_t camera_config;
+/** Holds the currently selected dithering algorithm. */
+DitheringAlgorithm ditherAlgorithm = FLOYD_STEINBERG;
 
-// Flag to store jpeg images to sd card.
-bool storeJpeg = false;
+/** Entry point of the program. */
+void setup() {
+    // Begin serial communication.
+    Serial.begin(230400); // 115200
 
-void setup()
-{
-  Serial.begin(230400); // 115200
-  initializeCamera();
+    // Initialize the camera.
+    initialize_camera();
 }
 
-void loop()
-{
-  if (!stopStream)
-  {
-    camera_fb_t *frame_buffer = esp_camera_fb_get();
-    if (frame_buffer)
-    {
-      // Process and Send Grayscale image.
-      processImage(frame_buffer);
-      // Return the frame buffer back to the camera driver.
-      esp_camera_fb_return(frame_buffer);
+/** Main loop of the program. */
+void loop() {
+    if (isStreamEnabled) {
+        camera_fb_t* frame_buffer = esp_camera_fb_get();
+        if (frame_buffer) {
+            process_image(frame_buffer);
+            // Return the frame buffer back to the camera driver.
+            esp_camera_fb_return(frame_buffer);
+        }
+        delay(50);
     }
-    delay(25);
-  }
-  // Handle any available serial input commands.
-  handleSerialInput();
+    process_serial_commands();
 }
 
-void handleSerialInput()
-{
-  if (Serial.available() > 0)
-  {
-    char input = Serial.read();
-    sensor_t *cameraSensor = esp_camera_sensor_get();
-
-    switch (input)
-    {
-    case '>': // Toggle dithering.
-      disableDithering = !disableDithering;
-      break;
-    case '<': // Toggle invert.
-      invert = !invert;
-      break;
-    case 'b': // Remove brightness.
-      cameraSensor->set_contrast(
-          cameraSensor,
-          cameraSensor->status.brightness - 1);
-      break;
-    case 'B': // Add brightness.
-      cameraSensor->set_contrast(
-          cameraSensor,
-          cameraSensor->status.brightness + 1);
-      break;
-    case 'c': // Remove contrast.
-      cameraSensor->set_contrast(
-          cameraSensor,
-          cameraSensor->status.contrast - 1);
-      break;
-    case 'C': // Add contrast.
-      cameraSensor->set_contrast(
-          cameraSensor,
-          cameraSensor->status.contrast + 1);
-      break;
-    case 'f': // Toggle flash off.
-      isFlashEnabled = false;
-      break;
-    case 'F': // Toggle flash on.
-      isFlashEnabled = true;
-      break;
-    case 'j': // Toggle store jpeg to sd card off.
-      storeJpeg = false;
-      break;
-    case 'J': // Toggle store jpeg to sd card on.
-      storeJpeg = true;
-      break;
-    case 'P': // Picture sequence.
-      if (isFlashEnabled)
-      {
-        // Turn on torch.
-        pinMode(FLASH_GPIO_NUM, OUTPUT);
-        digitalWrite(FLASH_GPIO_NUM, HIGH);
-        // Give some time (500ms) for Flipper to save locally with flash on.
-        delay(500);
-        // Turn off torch.
-        digitalWrite(FLASH_GPIO_NUM, LOW);
-      }
-
-      // @todo - Future feature.
-      // if (storeJpeg) { saveJpegPictureToSDCard(); }
-      break;
-    case 'M': // Toggle Mirror.
-      cameraSensor->set_hmirror(cameraSensor, !cameraSensor->status.hmirror);
-      break;
-    case 's': // Stop stream.
-      stopStream = true;
-      break;
-    case 'S': // Start stream.
-      stopStream = false;
-      break;
-    case '0': // Use Floyd Steinberg dithering.
-      ditherAlgorithm = FLOYD_STEINBERG;
-      break;
-    case '1': // Use Jarvis Judice dithering.
-      ditherAlgorithm = JARVIS_JUDICE_NINKE;
-      break;
-    case '2': // Use Stucki dithering.
-      ditherAlgorithm = STUCKI;
-      break;
-    default:
-      // Do nothing.
-      break;
+void initialize_camera() {
+    // Set initial configurations.
+    camera_config.ledc_channel = LEDC_CHANNEL_0;
+    camera_config.ledc_timer = LEDC_TIMER_0;
+    camera_config.pin_d0 = Y2_GPIO_NUM;
+    camera_config.pin_d1 = Y3_GPIO_NUM;
+    camera_config.pin_d2 = Y4_GPIO_NUM;
+    camera_config.pin_d3 = Y5_GPIO_NUM;
+    camera_config.pin_d4 = Y6_GPIO_NUM;
+    camera_config.pin_d5 = Y7_GPIO_NUM;
+    camera_config.pin_d6 = Y8_GPIO_NUM;
+    camera_config.pin_d7 = Y9_GPIO_NUM;
+    camera_config.pin_xclk = XCLK_GPIO_NUM;
+    camera_config.pin_pclk = PCLK_GPIO_NUM;
+    camera_config.pin_vsync = VSYNC_GPIO_NUM;
+    camera_config.pin_href = HREF_GPIO_NUM;
+    camera_config.pin_sscb_sda = SIOD_GPIO_NUM;
+    camera_config.pin_sscb_scl = SIOC_GPIO_NUM;
+    camera_config.pin_pwdn = PWDN_GPIO_NUM;
+    camera_config.pin_reset = RESET_GPIO_NUM;
+    camera_config.xclk_freq_hz = 20000000;
+    camera_config.pixel_format = PIXFORMAT_GRAYSCALE;
+    camera_config.frame_size = FRAMESIZE_QQVGA;
+    camera_config.fb_count = 1;
+
+    esp_err_t err = esp_camera_init(&camera_config);
+    if (err != ESP_OK) {
+        return;
     }
-  }
-}
 
-void initializeCamera()
-{
-  // Set initial camera configurations for grayscale.
-  config.ledc_channel = LEDC_CHANNEL_0;
-  config.ledc_timer = LEDC_TIMER_0;
-  config.pin_d0 = Y2_GPIO_NUM;
-  config.pin_d1 = Y3_GPIO_NUM;
-  config.pin_d2 = Y4_GPIO_NUM;
-  config.pin_d3 = Y5_GPIO_NUM;
-  config.pin_d4 = Y6_GPIO_NUM;
-  config.pin_d5 = Y7_GPIO_NUM;
-  config.pin_d6 = Y8_GPIO_NUM;
-  config.pin_d7 = Y9_GPIO_NUM;
-  config.pin_xclk = XCLK_GPIO_NUM;
-  config.pin_pclk = PCLK_GPIO_NUM;
-  config.pin_vsync = VSYNC_GPIO_NUM;
-  config.pin_href = HREF_GPIO_NUM;
-  config.pin_sscb_sda = SIOD_GPIO_NUM;
-  config.pin_sscb_scl = SIOC_GPIO_NUM;
-  config.pin_pwdn = PWDN_GPIO_NUM;
-  config.pin_reset = RESET_GPIO_NUM;
-  config.xclk_freq_hz = 20000000;
-  config.pixel_format = PIXFORMAT_GRAYSCALE;
-  config.frame_size = FRAMESIZE_QQVGA;
-  config.fb_count = 1;
-
-  // Initialize camera.
-  esp_err_t err = esp_camera_init(&config);
-  if (err != ESP_OK)
-  {
-    return;
-  }
-
-  // Make sure torch starts as off.
-  pinMode(FLASH_GPIO_NUM, OUTPUT);
-  digitalWrite(FLASH_GPIO_NUM, LOW);
-
-  // Set initial contrast.
-  sensor_t *s = esp_camera_sensor_get();
-  s->set_contrast(s, 0);
-
-  // Set rotation.
-  s->set_vflip(s, true);   // Vertical flip.
-  s->set_hmirror(s, true); // Horizontal mirror.
+    // Check if the flash is already on, if it is turn it off.
+    if (isFlashEnabled) {
+        toggle_flash_off();
+    }
+
+    // Get the camera sensor reference.
+    sensor_t* cam = esp_camera_sensor_get();
+
+    cam->set_contrast(cam, 0); // Set initial contrast.
+    cam->set_vflip(cam, true); // Set initial rotation (vertical).
+
+    // cam->set_brightness(cam, 0); // Set initial brightness.
+    // cam->set_hmirror(cam, true); // Set initial rotation (horizontal).
+    // cam->set_saturation(cam, 0); // Set initial saturation.
+    // cam->set_sharpness(cam, 0);  // Set initial sharpness.
 }
 
-void processImage(camera_fb_t *frame_buffer)
-{
-  // If dithering is not disabled, perform dithering on the image. Dithering is the
-  // process of approximating the look of a high-resolution grayscale image in a
-  // lower resolution by binary values (black & white), thereby representing
-  // different shades of gray.
-  if (!disableDithering)
-  {
-    ditherImage(frame_buffer); // Invokes the dithering process on the frame buffer.
-  }
-
-  uint8_t flipper_y = 0;
-
-  // Iterating over specific rows of the frame buffer.
-  for (uint8_t y = 28; y < 92; ++y)
-  {
-    Serial.print("Y:");      // Print "Y:" for every new row.
-    Serial.write(flipper_y); // Send the row identifier as a byte.
-
-    // Calculate the actual y index in the frame buffer 1D array by multiplying the
-    // y value with the width of the frame buffer. This gives the starting index of
-    // the row in the 1D array.
-    size_t true_y = y * frame_buffer->width;
-
-    // Iterating over specific columns of each row in the frame buffer.
-    for (uint8_t x = 16; x < 144; x += 8)
-    { // step by 8 as we're packing 8 pixels per byte.
-      uint8_t packed_pixels = 0;
-      // Packing 8 pixel values into one byte.
-      for (uint8_t bit = 0; bit < 8; ++bit)
-      {
-        // Check the invert flag and pack the pixels accordingly.
-        if (invert)
-        {
-          // If invert is true, consider pixel as 1 if it's more than 127.
-          if (frame_buffer->buf[true_y + x + bit] > 127)
-          {
-            packed_pixels |= (1 << (7 - bit));
-          }
+void dither_image(camera_fb_t* frame_buffer) {
+    for (uint8_t y = 0; y < frame_buffer->height; ++y) {
+        for (uint8_t x = 0; x < frame_buffer->width; ++x) {
+            size_t current = (y * frame_buffer->width) + x;
+            uint8_t oldpixel = frame_buffer->buf[current];
+            uint8_t newpixel = oldpixel >= 128 ? 255 : 0;
+            frame_buffer->buf[current] = newpixel;
+            int8_t quant_error = oldpixel - newpixel;
+
+            // Apply error diffusion based on the selected algorithm.
+            switch (ditherAlgorithm) {
+            case JARVIS_JUDICE_NINKE:
+                frame_buffer->buf[(y * frame_buffer->width) + x + 1] +=
+                    quant_error * 7 / 48;
+                frame_buffer->buf[(y * frame_buffer->width) + x + 2] +=
+                    quant_error * 5 / 48;
+                frame_buffer->buf[(y + 1) * frame_buffer->width + x - 2] +=
+                    quant_error * 3 / 48;
+                frame_buffer->buf[(y + 1) * frame_buffer->width + x - 1] +=
+                    quant_error * 5 / 48;
+                frame_buffer->buf[(y + 1) * frame_buffer->width + x] +=
+                    quant_error * 7 / 48;
+                frame_buffer->buf[(y + 1) * frame_buffer->width + x + 1] +=
+                    quant_error * 5 / 48;
+                frame_buffer->buf[(y + 1) * frame_buffer->width + x + 2] +=
+                    quant_error * 3 / 48;
+                frame_buffer->buf[(y + 2) * frame_buffer->width + x - 2] +=
+                    quant_error * 1 / 48;
+                frame_buffer->buf[(y + 2) * frame_buffer->width + x - 1] +=
+                    quant_error * 3 / 48;
+                frame_buffer->buf[(y + 2) * frame_buffer->width + x] +=
+                    quant_error * 5 / 48;
+                frame_buffer->buf[(y + 2) * frame_buffer->width + x + 1] +=
+                    quant_error * 3 / 48;
+                frame_buffer->buf[(y + 2) * frame_buffer->width + x + 2] +=
+                    quant_error * 1 / 48;
+                break;
+            case STUCKI:
+                frame_buffer->buf[(y * frame_buffer->width) + x + 1] +=
+                    quant_error * 8 / 42;
+                frame_buffer->buf[(y * frame_buffer->width) + x + 2] +=
+                    quant_error * 4 / 42;
+                frame_buffer->buf[(y + 1) * frame_buffer->width + x - 2] +=
+                    quant_error * 2 / 42;
+                frame_buffer->buf[(y + 1) * frame_buffer->width + x - 1] +=
+                    quant_error * 4 / 42;
+                frame_buffer->buf[(y + 1) * frame_buffer->width + x] +=
+                    quant_error * 8 / 42;
+                frame_buffer->buf[(y + 1) * frame_buffer->width + x + 1] +=
+                    quant_error * 4 / 42;
+                frame_buffer->buf[(y + 1) * frame_buffer->width + x + 2] +=
+                    quant_error * 2 / 42;
+                frame_buffer->buf[(y + 2) * frame_buffer->width + x - 2] +=
+                    quant_error * 1 / 42;
+                frame_buffer->buf[(y + 2) * frame_buffer->width + x - 1] +=
+                    quant_error * 2 / 42;
+                frame_buffer->buf[(y + 2) * frame_buffer->width + x] +=
+                    quant_error * 4 / 42;
+                frame_buffer->buf[(y + 2) * frame_buffer->width + x + 1] +=
+                    quant_error * 2 / 42;
+                frame_buffer->buf[(y + 2) * frame_buffer->width + x + 2] +=
+                    quant_error * 1 / 42;
+                break;
+            case FLOYD_STEINBERG:
+            default:
+                frame_buffer->buf[(y * frame_buffer->width) + x + 1] +=
+                    quant_error * 7 / 16;
+                frame_buffer->buf[(y + 1) * frame_buffer->width + x - 1] +=
+                    quant_error * 3 / 16;
+                frame_buffer->buf[(y + 1) * frame_buffer->width + x] +=
+                    quant_error * 5 / 16;
+                frame_buffer->buf[(y + 1) * frame_buffer->width + x + 1] +=
+                    quant_error * 1 / 16;
+                break;
+            }
         }
-        else
-        {
-          // If invert is false, consider pixel as 1 if it's less than 127.
-          if (frame_buffer->buf[true_y + x + bit] < 127)
-          {
-            packed_pixels |= (1 << (7 - bit));
-          }
-        }
-      }
-      Serial.write(packed_pixels); // Sending packed pixel byte.
     }
+}
 
-    ++flipper_y;    // Move to the next row.
-    Serial.flush(); // Ensure all data in the Serial buffer is sent before moving to the next iteration.
-  }
+void process_image(camera_fb_t* frame_buffer) {
+    // If dithering is not disabled, perform dithering on the image. Dithering
+    // is the process of approximating the look of a high-resolution grayscale
+    // image in a lower resolution by binary values (black & white), thereby
+    // representing different shades of gray.
+    if (isDitheringEnabled) {
+        // Invokes the dithering process on the frame buffer.
+        dither_image(frame_buffer);
+    }
+
+    uint8_t flipper_y = 0;
+
+    // Iterating over specific rows of the frame buffer.
+    for (uint8_t y = 28; y < 92; ++y) {
+        Serial.print("Y:");      // Print "Y:" for every new row.
+        Serial.write(flipper_y); // Send the row identifier as a byte.
+
+        // Calculate the actual y index in the frame buffer 1D array by
+        // multiplying the y value with the width of the frame buffer. This
+        // gives the starting index of the row in the 1D array.
+        size_t true_y = y * frame_buffer->width;
+
+        // Iterating over specific columns of each row in the frame buffer.
+        for (uint8_t x = 16; x < 144;
+             x += 8) { // step by 8 as we're packing 8 pixels per byte.
+            uint8_t packed_pixels = 0;
+            // Packing 8 pixel values into one byte.
+            for (uint8_t bit = 0; bit < 8; ++bit) {
+                // Check the invert flag and pack the pixels accordingly.
+                if (isInvertEnabled) {
+                    // If invert is true, consider pixel as 1 if it's more than
+                    // 127.
+                    if (frame_buffer->buf[true_y + x + bit] > 127) {
+                        packed_pixels |= (1 << (7 - bit));
+                    }
+                } else {
+                    // If invert is false, consider pixel as 1 if it's less than
+                    // 127.
+                    if (frame_buffer->buf[true_y + x + bit] < 127) {
+                        packed_pixels |= (1 << (7 - bit));
+                    }
+                }
+            }
+            Serial.write(packed_pixels); // Sending packed pixel byte.
+        }
+        // Move to the next row.
+        ++flipper_y;
+        // Ensure all data in the Serial buffer is sent before moving to the
+        // next iteration.
+        Serial.flush();
+    }
 }
 
-void ditherImage(camera_fb_t *frame_buffer)
-{
-  for (uint8_t y = 0; y < frame_buffer->height; ++y)
-  {
-    for (uint8_t x = 0; x < frame_buffer->width; ++x)
-    {
-      size_t current = (y * frame_buffer->width) + x;
-      uint8_t oldpixel = frame_buffer->buf[current];
-      uint8_t newpixel = oldpixel >= 128 ? 255 : 0;
-      frame_buffer->buf[current] = newpixel;
-      int8_t quant_error = oldpixel - newpixel;
-
-      // Apply error diffusion based on the selected algorithm
-      switch (ditherAlgorithm)
-      {
-      case JARVIS_JUDICE_NINKE:
-        frame_buffer->buf[(y * frame_buffer->width) + x + 1] += quant_error * 7 / 48;
-        frame_buffer->buf[(y * frame_buffer->width) + x + 2] += quant_error * 5 / 48;
-        frame_buffer->buf[(y + 1) * frame_buffer->width + x - 2] += quant_error * 3 / 48;
-        frame_buffer->buf[(y + 1) * frame_buffer->width + x - 1] += quant_error * 5 / 48;
-        frame_buffer->buf[(y + 1) * frame_buffer->width + x] += quant_error * 7 / 48;
-        frame_buffer->buf[(y + 1) * frame_buffer->width + x + 1] += quant_error * 5 / 48;
-        frame_buffer->buf[(y + 1) * frame_buffer->width + x + 2] += quant_error * 3 / 48;
-        frame_buffer->buf[(y + 2) * frame_buffer->width + x - 2] += quant_error * 1 / 48;
-        frame_buffer->buf[(y + 2) * frame_buffer->width + x - 1] += quant_error * 3 / 48;
-        frame_buffer->buf[(y + 2) * frame_buffer->width + x] += quant_error * 5 / 48;
-        frame_buffer->buf[(y + 2) * frame_buffer->width + x + 1] += quant_error * 3 / 48;
-        frame_buffer->buf[(y + 2) * frame_buffer->width + x + 2] += quant_error * 1 / 48;
-        break;
-      case STUCKI:
-        frame_buffer->buf[(y * frame_buffer->width) + x + 1] += quant_error * 8 / 42;
-        frame_buffer->buf[(y * frame_buffer->width) + x + 2] += quant_error * 4 / 42;
-        frame_buffer->buf[(y + 1) * frame_buffer->width + x - 2] += quant_error * 2 / 42;
-        frame_buffer->buf[(y + 1) * frame_buffer->width + x - 1] += quant_error * 4 / 42;
-        frame_buffer->buf[(y + 1) * frame_buffer->width + x] += quant_error * 8 / 42;
-        frame_buffer->buf[(y + 1) * frame_buffer->width + x + 1] += quant_error * 4 / 42;
-        frame_buffer->buf[(y + 1) * frame_buffer->width + x + 2] += quant_error * 2 / 42;
-        frame_buffer->buf[(y + 2) * frame_buffer->width + x - 2] += quant_error * 1 / 42;
-        frame_buffer->buf[(y + 2) * frame_buffer->width + x - 1] += quant_error * 2 / 42;
-        frame_buffer->buf[(y + 2) * frame_buffer->width + x] += quant_error * 4 / 42;
-        frame_buffer->buf[(y + 2) * frame_buffer->width + x + 1] += quant_error * 2 / 42;
-        frame_buffer->buf[(y + 2) * frame_buffer->width + x + 2] += quant_error * 1 / 42;
-        break;
-      case FLOYD_STEINBERG:
-      default:
-        // Default to Floyd-Steinberg dithering if an invalid algorithm is selected
-        frame_buffer->buf[(y * frame_buffer->width) + x + 1] += quant_error * 7 / 16;
-        frame_buffer->buf[(y + 1) * frame_buffer->width + x - 1] += quant_error * 3 / 16;
-        frame_buffer->buf[(y + 1) * frame_buffer->width + x] += quant_error * 5 / 16;
-        frame_buffer->buf[(y + 1) * frame_buffer->width + x + 1] += quant_error * 1 / 16;
-        break;
-      }
+void process_serial_commands() {
+    if (Serial.available() > 0) {
+        char input = Serial.read();
+        sensor_t* cam = esp_camera_sensor_get();
+
+        switch (input) {
+        case '>': // Toggle dithering.
+            isDitheringEnabled = !isDitheringEnabled;
+            break;
+        case '<': // Toggle invert.
+            isInvertEnabled = !isInvertEnabled;
+            break;
+        case 'b': // Remove brightness.
+            cam->set_contrast(cam, cam->status.brightness - 1);
+            break;
+        case 'B': // Add brightness.
+            cam->set_contrast(cam, cam->status.brightness + 1);
+            break;
+        case 'c': // Remove contrast.
+            cam->set_contrast(cam, cam->status.contrast - 1);
+            break;
+        case 'C': // Add contrast.
+            cam->set_contrast(cam, cam->status.contrast + 1);
+            break;
+        case 'f': // Turn the flash off.
+            toggle_flash_off();
+            break;
+        case 'F': // Turn the flash on.
+            toggle_flash_on();
+            break;
+        case 'P': // Save image to the onboard SD card.
+            // @todo - Future feature.
+            // save_picture_to_sd();
+            break;
+        case 'M': // Toggle Mirror.
+            cam->set_hmirror(cam, !cam->status.hmirror);
+            break;
+        case 's': // Stop stream.
+            isStreamEnabled = false;
+            break;
+        case 'S': // Start stream.
+            isStreamEnabled = true;
+            break;
+        case '0': // Use Floyd Steinberg dithering.
+            ditherAlgorithm = FLOYD_STEINBERG;
+            break;
+        case '1': // Use Jarvis Judice dithering.
+            ditherAlgorithm = JARVIS_JUDICE_NINKE;
+            break;
+        case '2': // Use Stucki dithering.
+            ditherAlgorithm = STUCKI;
+            break;
+        default:
+            // Do nothing.
+            break;
+        }
     }
-  }
 }
 
-// @todo - Future feature.
-void saveJpegPictureToSDCard()
-{
-  // Get camera sensor.
-  sensor_t *s = esp_camera_sensor_get();
-
-  // Check if the sensor is valid.
-  if (!s)
-  {
-    Serial.println("Failed to acquire camera sensor");
-    return;
-  }
-
-  // Set pixel format to JPEG for saving picture.
-  s->set_pixformat(s, PIXFORMAT_JPEG);
-
-  // Set frame size based on available PSRAM.
-  if (psramFound())
-  {
-    s->set_framesize(s, FRAMESIZE_UXGA);
-  }
-  else
-  {
-    s->set_framesize(s, FRAMESIZE_SVGA);
-  }
-
-  // Get a frame buffer from camera.
-  camera_fb_t *frame_buffer = esp_camera_fb_get();
-  if (!frame_buffer)
-  {
-    Serial.println("Camera capture failed");
-    return;
-  }
-
-  if (!SD_MMC.begin())
-  {
-    // SD Card Mount Failed.
-    Serial.println("SD Card Mount Failed");
-    esp_camera_fb_return(frame_buffer);
-    return;
-  }
-
-  // Generate a unique filename.
-  String path = "/picture";
-  path += String(millis());
-  path += ".jpg";
-
-  fs::FS &fs = SD_MMC;
-  File file = fs.open(path.c_str(), FILE_WRITE);
-
-  if (!file)
-  {
-    Serial.println("Failed to open file in writing mode");
-  }
-  else
-  {
-    if (file.write(frame_buffer->buf, frame_buffer->len) != frame_buffer->len)
-    {
-      Serial.println("Failed to write the image to the file");
+/**
+void save_picture_to_sd() {
+    sensor_t* cam = esp_camera_sensor_get();
+
+    // Check if the sensor is valid.
+    if (!cam) {
+        Serial.println("Failed to acquire camera sensor");
+        return;
+    }
+
+    // Set pixel format to JPEG for saving picture.
+    cam->set_pixformat(cam, PIXFORMAT_JPEG);
+
+    // Set frame size based on available PSRAM.
+    if (psramFound()) {
+        cam->set_framesize(cam, FRAMESIZE_UXGA);
+    } else {
+        cam->set_framesize(cam, FRAMESIZE_SVGA);
+    }
+
+    // Get a frame buffer from camera.
+    camera_fb_t* frame_buffer = esp_camera_fb_get();
+    if (!frame_buffer) {
+        // Camera capture failed
+        return;
+    }
+
+    if (!SD_MMC.begin()) {
+        // SD Card Mount Failed.
+        esp_camera_fb_return(frame_buffer);
+        return;
     }
-    file.close(); // Close the file in any case.
-  }
 
-  // Update framesize back to the default.
-  s->set_framesize(s, FRAMESIZE_QQVGA);
+    // Generate a unique filename.
+    String path = "/picture";
+    path += String(millis());
+    path += ".jpg";
+
+    fs::FS& fs = SD_MMC;
+    File file = fs.open(path.c_str(), FILE_WRITE);
+
+    if (!file) {
+        // Failed to open file in writing mode
+    } else {
+        if (file.write(frame_buffer->buf, frame_buffer->len) !=
+            frame_buffer->len) {
+            // Failed to write the image to the file
+        }
+        file.close(); // Close the file in any case.
+    }
+
+    // Update framesize back to the default.
+    cam->set_framesize(cam, FRAMESIZE_QQVGA);
+
+    // Return the frame buffer back to the camera driver.
+    esp_camera_fb_return(frame_buffer);
+}
+*/
+
+void toggle_flash_off() {
+    pinMode(FLASH_GPIO_NUM, OUTPUT);
+    digitalWrite(FLASH_GPIO_NUM, LOW);
+    isFlashEnabled = false;
+}
 
-  // Return the frame buffer back to the camera driver.
-  esp_camera_fb_return(frame_buffer);
+void toggle_flash_on() {
+    pinMode(FLASH_GPIO_NUM, OUTPUT);
+    digitalWrite(FLASH_GPIO_NUM, HIGH);
+    isFlashEnabled = true;
 }