Src/tim.c

@@ -50,7 +50,7 @@ void MX_TIM3_Init(void)
   htim3.Instance = TIM3;
   htim3.Init.Prescaler = 0;
   htim3.Init.CounterMode = TIM_COUNTERMODE_UP;
-  htim3.Init.Period = 1800; // MX: changed from 1800
+  htim3.Init.Period = 3600; // MX: changed from 1800
   htim3.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
   if (HAL_TIM_OC_Init(&htim3) != HAL_OK)
   {

User/user_main.c

@@ -23,7 +23,6 @@
 
 #define SCREEN_W 32
 #define SCREEN_H 16
-#define DEFAULT_BRIGHTNESS 2
 
 // Pins
 #define BTN_CENTER 0
@@ -33,16 +32,9 @@
 #define BTN_DOWN 4
 
 // Y axis scaling factors
-#define WAVEFORM_SCALE 0.02
+#define WAVEFORM_SCALE 0.007f
-#define FFT_PRELOG_SCALE 1.0
+#define FFT_SCALE 0.25f * 0.3f
-#define FFT_FINAL_SCALE 3.0
+#define FFT_SPINDLE_SCALE_MULT 0.5f
-#define FFT_PREFFT_SCALE 0.4
-
-#define VOL_STEP_TIME 50
-#define VOL_STEP 0.05
-#define VOL_STEP_LARGE 0.75
-#define VOL_STEP_THRESH 0.01
-#define VOL_STEP_SPEEDUP_TIME 750
 
 uint32_t audio_samples[SAMPLE_COUNT * 2]; // 2x size needed for complex FFT
 float *audio_samples_f = (float *) audio_samples;
@@ -50,7 +42,6 @@ float *audio_samples_f = (float *) audio_samples;
 // counter for auto repeat
 ms_time_t updn_press_timer = 0;
 ms_time_t ltrt_press_timer = 0;
-ms_time_t updn_hold_ts;
 
 /** Dot matrix display instance */
 DotMatrix_Cfg *disp;
@@ -59,8 +50,8 @@ DotMatrix_Cfg *disp;
 volatile bool capture_pending = false;
 
 /** scale & brightness config fields. Initial values. */
-float y_scale = 1;
+float y_scale = 5;
-uint8_t brightness = DEFAULT_BRIGHTNESS;
+uint8_t brightness = 3;
 
 /** active rendering mode (visualisation preset) */
 enum {
@@ -180,17 +171,12 @@ void display_wave()
 	dmtx_show(disp);
 }
 
-/** Calculate FFT */
+/** Calculate and display FFT */
 static void calculate_fft()
 {
 	float *bins = audio_samples_f;
 
 	samples_to_float();
-
-	for (int i = 0; i < SAMPLE_COUNT; i++) {
-		bins[i] *= y_scale * FFT_PREFFT_SCALE; //win_hamming_512[i];
-	}
-
 	spread_samples_for_fft();
 
 	const arm_cfft_instance_f32 *S;
@@ -201,18 +187,17 @@ static void calculate_fft()
 
 	// Normalize & display
 
+	start_render();
+
+	float factor = (1.0f / BIN_COUNT) * FFT_SCALE * y_scale;
 	for (int i = 0; i < BIN_COUNT; i++) { // +1 because bin 0 is always 0
-		float bin = bins[i] * (1.0f / BIN_COUNT) * FFT_PRELOG_SCALE;
+		bins[i] *= factor;
-		bin = log2f(bin);
-		bins[i] = bin * FFT_FINAL_SCALE;
 	}
 }
 
 /** Render classic FFT */
 static void display_fft()
 {
-	start_render();
-
 	float *bins = audio_samples_f;
 
 	for (int x = 0; x < SCREEN_W; x++) {
@@ -227,12 +212,10 @@ static void display_fft()
 /** Render FFT "spindle" */
 static void display_fft_spindle()
 {
-	start_render();
-
 	float *bins = audio_samples_f;
 
 	for (int x = 0; x < SCREEN_W; x++) {
-		for (int j = 0; j < 1 + floorf(bins[x] * 0.5f); j++) {
+		for (int j = 0; j < 1 + floorf(bins[x] * FFT_SPINDLE_SCALE_MULT); j++) {
 			dmtx_set(disp, x, 7 + j, 1);
 			dmtx_set(disp, x, 7 - j, 1);
 		}
@@ -265,20 +248,16 @@ static void gamepad_button_cb(uint32_t btn, bool press)
 		case BTN_UP:
 			up_pressed = press;
 			if (press) {
-				updn_hold_ts = ms_now();
 				updn_press_timer = 0;
-				y_scale += VOL_STEP;
+				y_scale += 0.5f;
 			}
 			break;
 
 		case BTN_DOWN:
 			down_pressed = press;
 			if (press) {
-				updn_hold_ts = ms_now();
 				updn_press_timer = 0;
-				if (y_scale > VOL_STEP + VOL_STEP_THRESH) {
+				if (y_scale > 0.55) y_scale -= 0.5f;
-					y_scale -= VOL_STEP;
-				}
 			}
 			break;
 
@@ -386,7 +365,6 @@ void user_main()
 	user_init();
 
 	ms_time_t counter1 = 0;
-	ms_time_t counter2 = 0;
 	while (1) {
 		if (ms_loop_elapsed(&counter1, 500)) {
 			// Blink
@@ -395,31 +373,19 @@ void user_main()
 
 		// hold-to-repeat
 		// This is not the correct way to do it, but good enough
-		if (ms_loop_elapsed(&updn_press_timer, VOL_STEP_TIME)) {
+		if (ms_loop_elapsed(&updn_press_timer, 100)) {
 			if (up_pressed) {
-				if (ms_now() - updn_hold_ts > VOL_STEP_SPEEDUP_TIME) {
+				y_scale += 0.5;
-					y_scale += VOL_STEP_LARGE;
-				} else {
-					y_scale += VOL_STEP;
-				}
 			}
 
 			if (down_pressed) {
-				if (ms_now() - updn_hold_ts > VOL_STEP_SPEEDUP_TIME) {
+				if (y_scale > 0.55) {
-					if (y_scale > VOL_STEP_LARGE + VOL_STEP_THRESH) {
+					y_scale -= 0.5;
-						y_scale -= VOL_STEP_LARGE;
-					} else if (y_scale > VOL_STEP + VOL_STEP_THRESH) {
-						y_scale -= VOL_STEP;
-					}
-				} else {
-					if (y_scale > VOL_STEP + VOL_STEP_THRESH) {
-						y_scale -= VOL_STEP;
-					}
 				}
 			}
 
 			if (up_pressed || down_pressed) {
-				dbg("scale = %.2f", y_scale);
+				dbg("scale = %.1f", y_scale);
 			}
 		}
 
@@ -442,11 +408,9 @@ void user_main()
 		}
 
 		// capture a sample to update display
-		//if (ms_loop_elapsed(&counter2, 10)) {
 		if (!capture_pending) {
 			capture_start();
 		}
-		//}
 	}
 }