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444 lines
8.9 KiB
444 lines
8.9 KiB
//
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// Created by MightyPork on 2.9.16.
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//
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#include <inttypes.h>
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#include <arm_math.h>
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#include <arm_const_structs.h>
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#include <stm32f1xx_hal_gpio.h>
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#include "dotmatrix.h"
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#include "adc.h"
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#include "tim.h"
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#include "user_main.h"
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#include "debounce.h"
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#include "debug.h"
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#include "fft_windows.h"
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// 512 = show 0-5 kHz
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// 256 = show 0-10 kHz
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// smaller range is OK since we have only a limited reception of higher frequencies anyway
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#define SAMPLE_COUNT 512
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#define BIN_COUNT (SAMPLE_COUNT/2)
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#define CFFT_INST arm_cfft_sR_f32_len256
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#define SCREEN_W 32
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#define SCREEN_H 16
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// Pins
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#define BTN_CENTER 0
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#define BTN_LEFT 1
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#define BTN_RIGHT 2
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#define BTN_UP 3
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#define BTN_DOWN 4
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// Y axis scaling factors
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#define WAVEFORM_SCALE 0.007f
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#define FFT_SCALE 0.25f * 0.3f
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#define FFT_SPINDLE_SCALE_MULT 0.5f
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uint32_t audio_samples[SAMPLE_COUNT * 2]; // 2x size needed for complex FFT
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float *audio_samples_f = (float *) audio_samples;
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// counter for auto repeat
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ms_time_t updn_press_timer = 0;
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ms_time_t ltrt_press_timer = 0;
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/** Dot matrix display instance */
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DotMatrix_Cfg *disp;
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/** Capture in progress flag */
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volatile bool capture_pending = false;
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/** scale & brightness config fields. Initial values. */
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float y_scale = 5;
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uint8_t brightness = 3;
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/** active rendering mode (visualisation preset) */
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enum {
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MODE_SPECTRUM,
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MODE_SPECTRUM2,
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MODE_WAVEFORM,
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MAX_MODE
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} render_mode;
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bool up_pressed = false;
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bool down_pressed = false;
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bool left_pressed = false;
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bool right_pressed = false;
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static void display_wave();
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static void calculate_fft();
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static void display_fft();
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static void display_fft_spindle();
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static void start_render();
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// region Audio capture & display
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/** Start DMA to capture audio */
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void capture_start()
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{
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if (capture_pending) return;
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capture_pending = true;
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//uart_print("- Starting ADC DMA\n");
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HAL_ADC_Start_DMA(&hadc1, audio_samples, SAMPLE_COUNT);
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HAL_TIM_Base_Start(&htim3);
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}
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/** This callback is called by HAL after the transfer is complete */
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void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef *hadc)
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{
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switch (render_mode) {
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case MODE_WAVEFORM:
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display_wave();
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break;
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case MODE_SPECTRUM:
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calculate_fft();
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display_fft();
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break;
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case MODE_SPECTRUM2:
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calculate_fft();
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display_fft_spindle();
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break;
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}
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capture_pending = false;
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}
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/**
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* Convert audio samples to float.
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* NOTE: This trashes the original array of ints, they share the same memory location.
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*/
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void samples_to_float()
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{
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// Convert to float
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for (int i = 0; i < SAMPLE_COUNT; i++) {
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audio_samples_f[i] = (float) audio_samples[i];
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}
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// Obtain mean value
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float mean;
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arm_mean_f32(audio_samples_f, SAMPLE_COUNT, &mean);
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// Subtract mean from all samples
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for (int i = 0; i < SAMPLE_COUNT; i++) {
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audio_samples_f[i] -= mean;
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}
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}
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/** Spread numbers in the samples array so that they are interleaved by zeros (imaginary part) */
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void spread_samples_for_fft()
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{
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for (int i = SAMPLE_COUNT - 1; i >= 0; i--) {
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audio_samples_f[i * 2 + 1] = 0; // imaginary
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audio_samples_f[i * 2] = audio_samples_f[i]; // * win_hamming_512[i]; // real
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}
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}
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/** Display waveform preview */
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void display_wave()
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{
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samples_to_float();
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int x_offset = 0;
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for (int i = 1; i < SAMPLE_COUNT; i++) {
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if (audio_samples_f[i] > 0 && audio_samples_f[i - 1] < 0) {
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x_offset = i;
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break;
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}
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}
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// make sure we're not gonna run out of range
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if (x_offset >= SAMPLE_COUNT - SCREEN_W) {
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x_offset = 0;
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}
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float totalmult = WAVEFORM_SCALE * y_scale;
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start_render();
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for (int i = 0; i < SCREEN_W; i++) {
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dmtx_set(disp, i, 7 + roundf(audio_samples_f[i + x_offset] * totalmult), 1);
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}
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dmtx_show(disp);
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}
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/** Calculate and display FFT */
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static void calculate_fft()
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{
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float *bins = audio_samples_f;
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samples_to_float();
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spread_samples_for_fft();
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const arm_cfft_instance_f32 *S;
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S = &CFFT_INST;
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arm_cfft_f32(S, bins, 0, true); // bit reversed FFT
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arm_cmplx_mag_f32(bins, bins, BIN_COUNT); // get magnitude (extract real values)
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// Normalize & display
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start_render();
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float factor = (1.0f / BIN_COUNT) * FFT_SCALE * y_scale;
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for (int i = 0; i < BIN_COUNT; i++) { // +1 because bin 0 is always 0
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bins[i] *= factor;
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}
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}
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/** Render classic FFT */
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static void display_fft()
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{
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float *bins = audio_samples_f;
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for (int x = 0; x < SCREEN_W; x++) {
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for (int j = 0; j < 1 + floorf(bins[x]); j++) {
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dmtx_set(disp, x, j, 1);
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}
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}
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dmtx_show(disp);
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}
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/** Render FFT "spindle" */
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static void display_fft_spindle()
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{
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float *bins = audio_samples_f;
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for (int x = 0; x < SCREEN_W; x++) {
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for (int j = 0; j < 1 + floorf(bins[x] * FFT_SPINDLE_SCALE_MULT); j++) {
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dmtx_set(disp, x, 7 + j, 1);
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dmtx_set(disp, x, 7 - j, 1);
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}
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}
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dmtx_show(disp);
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}
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// endregion
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// region UI
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/** Clear screen & render "HUD" - button feedback lights */
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void start_render()
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{
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dmtx_clear(disp);
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if (up_pressed) dmtx_set(disp, SCREEN_W - 2, SCREEN_H - 1, 1);
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if (down_pressed) dmtx_set(disp, SCREEN_W - 2, SCREEN_H - 3, 1);
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if (left_pressed) dmtx_set(disp, SCREEN_W - 3, SCREEN_H - 2, 1);
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if (right_pressed) dmtx_set(disp, SCREEN_W - 1, SCREEN_H - 2, 1);
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}
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/** Callback when button press state changes */
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static void gamepad_button_cb(uint32_t btn, bool press)
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{
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dbg("Button press %d, state %d", btn, press);
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switch (btn) {
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case BTN_UP:
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up_pressed = press;
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if (press) {
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updn_press_timer = 0;
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y_scale += 0.5f;
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}
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break;
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case BTN_DOWN:
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down_pressed = press;
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if (press) {
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updn_press_timer = 0;
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if (y_scale > 0.55) y_scale -= 0.5f;
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}
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break;
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case BTN_LEFT:
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left_pressed = press;
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if (press) {
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ltrt_press_timer = 0;
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if (brightness > 0) brightness--;
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}
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break;
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case BTN_RIGHT:
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right_pressed = press;
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if (press) {
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ltrt_press_timer = 0;
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if (brightness < 15) brightness++;
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}
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break;
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case BTN_CENTER:
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if (!press) {
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// center button released
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// cycle through modes
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if (++render_mode == MAX_MODE) {
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render_mode = 0;
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}
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}
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info("Switched to render mode %d", render_mode);
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break;
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}
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}
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// endregion
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/**
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* Increment timebase counter each ms.
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* This is called by HAL, weak override.
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*/
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void HAL_SYSTICK_Callback(void)
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{
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timebase_ms_cb();
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}
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/** Init the application */
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void user_init()
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{
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// Enable audio input
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HAL_GPIO_WritePin(AUDIO_NSTBY_GPIO_Port, AUDIO_NSTBY_Pin, 1);
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// Init display
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DotMatrix_Init disp_init;
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disp_init.cols = 4;
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disp_init.rows = 2;
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disp_init.CS_GPIOx = SPI1_CS_GPIO_Port;
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disp_init.CS_PINx = SPI1_CS_Pin;
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disp_init.SPIx = SPI1;
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disp = dmtx_init(&disp_init);
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dmtx_intensity(disp, brightness);
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dmtx_clear(disp);
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dmtx_show(disp);
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timebase_init(5, 5);
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debounce_init(5);
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// Gamepad
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debo_init_t debo;
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debo.debo_time = 50;
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debo.invert = true;
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debo.callback = gamepad_button_cb;
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// Central button
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debo.cb_payload = BTN_CENTER;
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debo.GPIOx = BTN_CE_GPIO_Port;
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debo.pin = BTN_CE_Pin;
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debo_register_pin(&debo);
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// Left
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debo.cb_payload = BTN_LEFT;
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debo.GPIOx = BTN_L_GPIO_Port;
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debo.pin = BTN_L_Pin;
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debo_register_pin(&debo);
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// Right
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debo.cb_payload = BTN_RIGHT;
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debo.GPIOx = BTN_R_GPIO_Port;
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debo.pin = BTN_R_Pin;
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debo_register_pin(&debo);
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// Up
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debo.cb_payload = BTN_UP;
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debo.GPIOx = BTN_UP_GPIO_Port;
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debo.pin = BTN_UP_Pin;
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debo_register_pin(&debo);
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// Down
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debo.cb_payload = BTN_DOWN;
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debo.GPIOx = BTN_DN_GPIO_Port;
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debo.pin = BTN_DN_Pin;
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debo_register_pin(&debo);
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}
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/** Main function, called from MX-generated main.c */
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void user_main()
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{
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banner("== USER CODE STARTING ==");
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user_init();
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ms_time_t counter1 = 0;
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while (1) {
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if (ms_loop_elapsed(&counter1, 500)) {
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// Blink
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HAL_GPIO_TogglePin(LED1_GPIO_Port, LED1_Pin);
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}
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// hold-to-repeat
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// This is not the correct way to do it, but good enough
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if (ms_loop_elapsed(&updn_press_timer, 100)) {
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if (up_pressed) {
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y_scale += 0.5;
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}
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if (down_pressed) {
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if (y_scale > 0.55) {
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y_scale -= 0.5;
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}
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}
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if (up_pressed || down_pressed) {
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dbg("scale = %.1f", y_scale);
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}
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}
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if (ms_loop_elapsed(<rt_press_timer, 250)) {
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if (left_pressed) {
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if (brightness > 0) {
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brightness--;
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}
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}
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if (right_pressed) {
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if (brightness < 15) {
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brightness++;
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}
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}
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if (left_pressed || right_pressed) {
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dmtx_intensity(disp, brightness);
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}
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}
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// capture a sample to update display
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if (!capture_pending) {
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capture_start();
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}
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}
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}
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//region Error handlers
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/** Called from MX-generated HAL error handler */
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void user_Error_Handler()
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{
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error("HAL error occurred.\n");
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while (1);
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}
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/**
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* @brief Reports the name of the source file and the source line number
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* where the assert_param error has occurred.
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* @param file: pointer to the source file name
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* @param line: assert_param error line source number
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* @retval None
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*/
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void user_assert_failed(uint8_t *file, uint32_t line)
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{
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user_error_file_line("Assert failed", (const char *) file, line);
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}
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void user_error_file_line(const char *message, const char *file, uint32_t line)
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{
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error("%s in file %s on line %d", message, file, line);
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while (1);
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}
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// endregion
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