firmware/main.c

@@ -26,6 +26,7 @@ volatile int32_t temperature;
 extern void sk6812_send_led(uint32_t rgbw);
 
 volatile uint32_t wait_tick = 0;
+volatile bool blink_tick = false;
 
 static void wait_for_ticks(uint32_t ticks)
 {
@@ -43,8 +44,13 @@ int main(void)
 
 	bool button_pressed = false;
 	bool force_led_update;
+	bool overtemp_flag = false;
 	enum ring_modes mode;
 
+	/* Led value / mode before going to DMX */
+	uint32_t led_val_before_dmx = 0u;
+	enum ring_modes mode_before_dmx = RING_MODE_RED; /* Init to save value */
+
 	RCC->AHBENR |= RCC_AHBENR_GPIOAEN | RCC_AHBENR_GPIOBEN;
 	RCC->APB1ENR |= RCC_APB1ENR_TIM3EN | RCC_APB1ENR_TIM14EN;
 
@@ -101,12 +107,26 @@ int main(void)
 		}
 
 		/*! -# Gradually dim down the LED brightness in case the temperature is too high */
-		if (temperature > ((MAX_TEMP_CELSIUS) * 10)) {
-			if (led_val > 20)
+		if (overtemp_flag) {
+			if (temperature < (MAX_TEMP_CELSIUS-15) * 10) {
+				overtemp_flag = false;
+			}
+		} else {
+			overtemp_flag = temperature > ((MAX_TEMP_CELSIUS) * 10) ? true : false;
+		}
+		if (overtemp_flag) {
+			if (led_val > 2 && mode < RING_MODE_MAX)
 				led_val--;
 		}
 
 		if (dmx_poll_break_received()) {
+			/* DMX received. Go to DMX mode.
+			 * Save old state
+			 */
+			if (mode < RING_MODE_MAX) {
+				led_val_before_dmx = led_val;
+				mode_before_dmx = mode;
+			}
 			mode = RING_MODE_WAIT_DMX;
 		}
 
@@ -181,7 +201,7 @@ int main(void)
 			break;
 		case RING_MODE_WAIT_DMX:
 			force_led_update = false;
-			if (dmx_enough_data_received()) {
+			if (dmx_enough_data_received() && !overtemp_flag) {
 				dmx_data = dmx_get_data();
 				mode = RING_MODE_WAIT_DMX_BREAK;
 				if (dmx_data[0] != 0)
@@ -194,6 +214,12 @@ int main(void)
 				}
 				led_pwm_val = dmx_data[129];
 				force_led_update = true;
+			} else if (overtemp_flag) {
+				force_led_update = true;
+				for (int i = 0; i < RING_MAX_LED; i++) {
+					led_calc_val[i] = 0ul;
+				}
+				led_pwm_val = 0;
 			}
 			break;
 		case RING_MODE_WAIT_DMX_BREAK:
@@ -206,6 +232,11 @@ int main(void)
 			break;
 		}
 
+		if (overtemp_flag) {
+			force_led_update = true;
+			led_calc_val[0] = blink_tick ? 0x00FF0000UL : 0UL;
+		}
+
 		if (force_led_update) {
 			TIM14->CCR1 = led_pwm_val;
 
@@ -221,7 +252,7 @@ int main(void)
 		}
 
 		/* Only wait in case of non-DMX mode */
-		if (!(mode == RING_MODE_WAIT_DMX_BREAK || mode == RING_MODE_WAIT_DMX))
+		if (!(mode == RING_MODE_WAIT_DMX_BREAK || mode == RING_MODE_WAIT_DMX) || overtemp_flag)
 			wait_for_ticks(5);
 
 		if((int16_t)TIM3->CNT > (int16_t)led_val) {
@@ -239,14 +270,30 @@ int main(void)
 			if(GPIOA->IDR & GPIO_IDR_0) {
 				button_pressed = false;
 			}
-		}
-		else if(!(GPIOA->IDR & GPIO_IDR_0)) {
-			mode = (mode + 1) % RING_MODE_MAX;
+		} else if(!(GPIOA->IDR & GPIO_IDR_0)) {
 			button_pressed = true;
+			/* Button pressed */
+			if (mode > RING_MODE_MAX) {
+				/* In DMX mode. Abort DMX mode */
+				mode = mode_before_dmx;
+				led_val = led_val_before_dmx;
+			} else {
+				/* Normal mode switching */
+				mode = (mode + 1) % RING_MODE_MAX;
+			}
 		}
 	}
 }
 
-void SysTick_Handler(void) {
+void SysTick_Handler(void)
+{
+	static uint32_t tick = 10;
+
+	if (!--tick) {
+		tick = 10;
+		blink_tick = !blink_tick;
+	}
+
+
 	wait_tick++;
 }