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@ -5,6 +5,8 @@ |
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#include <inttypes.h> |
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#include <stm32f1xx_hal_gpio.h> |
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#include <dotmatrix.h> |
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#include <arm_math.h> |
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#include <arm_const_structs.h> |
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#include "mxconstants.h" |
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#include "stm32f1xx_hal.h" |
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#include "utils.h" |
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@ -12,29 +14,73 @@ |
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#include "tim.h" |
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#include "user_main.h" |
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static uint32_t audio_samples[256]; |
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#define SAMPLE_COUNT 256 |
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#define BIN_COUNT (SAMPLE_COUNT/2) |
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#define SCREEN_W 32 |
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#define SCREEN_H 16 |
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static uint32_t audio_samples[SAMPLE_COUNT * 2]; // 2x size needed for complex FFT
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static float *audio_samples_f = (float *) audio_samples; |
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static DotMatrix_Cfg *disp; |
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void start_DMA() { |
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static volatile bool capture_pending = false; |
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static void display_wave(); |
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static void display_fft(); |
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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, 32); |
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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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// uart_print("- DMA complete.\n");
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void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef *hadc) |
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{ |
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display_wave(); |
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capture_pending = false; |
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} |
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// char x[100];
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//
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// for (int i = 0; i < 256; i++) {
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// sprintf(x, "%"PRIu32" ", audio_samples[i]);
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// uart_print(x);
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// }
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// uart_print("\n");
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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]; // 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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dmtx_clear(disp); |
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for (int i = 0; i < 32; i++) { |
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dmtx_set(disp, i, ((audio_samples[i]) >> 6) - 24, 1); |
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@ -42,7 +88,42 @@ void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef *hadc) { |
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dmtx_show(disp); |
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} |
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void user_main() { |
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/** Calculate and display 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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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 = &arm_cfft_sR_f32_len128; |
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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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dmtx_clear(dmtx); |
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float factor = (1.0f / BIN_COUNT) * 0.25f; |
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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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// TODO implement offset using gamepad buttons
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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(dmtx, x, j, 1); |
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} |
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} |
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dmtx_show(dmtx); |
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} |
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void user_main() |
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{ |
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uart_print("== USER CODE STARTING ==\n"); |
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// Leds OFF
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@ -67,22 +148,26 @@ void user_main() { |
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dmtx_clear(disp); |
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dmtx_show(disp); |
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uint32_t counter = 0; |
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while (1) { |
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if (counter++ == 500) { |
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counter = 0; |
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// Blink
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HAL_GPIO_TogglePin(LED1_GPIO_Port, LED1_Pin); |
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HAL_Delay(50); |
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} |
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//uart_print("Main loop\n");
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start_DMA(); |
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HAL_Delay(1); |
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//dmtx_toggle(disp, 31, 15);
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//dmtx_show(disp);
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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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void user_Error_Handler() { |
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void user_Error_Handler() |
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{ |
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uart_print("HAL error occurred.\n"); |
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while (1); |
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} |
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@ -94,11 +179,13 @@ void user_Error_Handler() { |
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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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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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void user_error_file_line(const char *message, const char *file, uint32_t line) |
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{ |
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uart_print(message); |
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uart_print(" in file "); |
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uart_print((char *) file); |
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