Momentum-Apps/view_raw_signal.c

/* Copyright (C) 2022-2023 Salvatore Sanfilippo -- All Rights Reserved
 * See the LICENSE file for information about the license. */

#include "app.h"

/* Render the received signal.
 *
 * The screen of the flipper is 128 x 64. Even using 4 pixels per line
 * (where low level signal is one pixel high, high level is 4 pixels
 * high) and 4 pixels of spacing between the different lines, we can
 * plot comfortably 8 lines.
 *
 * The 'idx' argument is the first sample to render in the circular
 * buffer. */
void render_signal(ProtoViewApp *app, Canvas *const canvas, RawSamplesBuffer *buf, uint32_t idx) {
    canvas_set_color(canvas, ColorBlack);

    int rows = 8;
    uint32_t time_per_pixel = app->us_scale;
    uint32_t start_idx = idx;
    bool level = 0;
    uint32_t dur = 0, sample_num = 0;
    for (int row = 0; row < rows ; row++) {
        for (int x = 0; x < 128; x++) {
            int y = 3 + row*8;
            if (dur < time_per_pixel/2) {
                /* Get more data. */
                raw_samples_get(buf, idx++, &level, &dur);
                sample_num++;
            }

            canvas_draw_line(canvas, x,y,x,y-(level*3));

            /* Write a small triangle under the last sample detected. */
            if (app->signal_bestlen != 0 &&
                sample_num+start_idx == app->signal_bestlen+1)
            {
                canvas_draw_dot(canvas,x,y+2);
                canvas_draw_dot(canvas,x-1,y+3);
                canvas_draw_dot(canvas,x,y+3);
                canvas_draw_dot(canvas,x+1,y+3);
                sample_num++; /* Make sure we don't mark the next, too. */
            }

            /* Remove from the current level duration the time we
             * just plot. */
            if (dur > time_per_pixel)
                dur -= time_per_pixel;
            else
                dur = 0;
        }
    }
}

/* Raw pulses rendering. This is our default view. */
void render_view_raw_pulses(Canvas *const canvas, ProtoViewApp *app) {
    /* Show signal. */
    render_signal(app, canvas, DetectedSamples, app->signal_offset);

    /* Show signal information. */
    char buf[64];
    snprintf(buf,sizeof(buf),"%luus",
        (unsigned long)DetectedSamples->short_pulse_dur);
    canvas_set_font(canvas, FontSecondary);
    canvas_draw_str_with_border(canvas, 97, 63, buf, ColorWhite, ColorBlack);
}

/* Handle input for the raw pulses view. */
void process_input_raw_pulses(ProtoViewApp *app, InputEvent input) {
    if (input.type == InputTypeRepeat) {
        /* Handle panning of the signal window. Long pressing
         * right will show successive samples, long pressing left
         * previous samples. */
        if (input.key == InputKeyRight) app->signal_offset++;
        else if (input.key == InputKeyLeft) app->signal_offset--;
        else if (input.key == InputKeyOk) {
            app->signal_offset = 0;
            app->us_scale = PROTOVIEW_RAW_VIEW_DEFAULT_SCALE;
        }
    } else if (input.type == InputTypeShort) {
        if (input.key == InputKeyOk) {
            /* Reset the current sample to capture the next. */
            app->signal_bestlen = 0;
            app->signal_offset = 0;
            raw_samples_reset(DetectedSamples);
            raw_samples_reset(RawSamples);
        } else if (input.key == InputKeyDown) {
            /* Rescaling. The set becomes finer under 50us per pixel. */
            uint32_t scale_step = app->us_scale >= 50 ? 50 : 10;
            if (app->us_scale < 500) app->us_scale += scale_step;
        } else if (input.key == InputKeyUp) {
            uint32_t scale_step = app->us_scale > 50 ? 50 : 10;
            if (app->us_scale > 10) app->us_scale -= scale_step;
        }
    }
}