functional LED code, first untested implementation

Software/Core/Inc/led.h

@@ -0,0 +1,20 @@
+#ifndef __LED_H
+#define __LED_H
+
+#include "stm32h7xx_hal.h"
+
+#define LED_TIM TIM3
+#define LED_CH_R TIM_CHANNEL_1
+#define LED_CH_G TIM_CHANNEL_2
+#define LED_CH_B TIM_CHANNEL_3
+#define DUTY_CYCLE_R LED_TIM->CCR1
+#define DUTY_CYCLE_G LED_TIM->CCR2
+#define DUTY_CYCLE_B LED_TIM->CCR3
+
+#define COLOR_HEARTBEAT 0x0000FFFF
+#define COLOR_ERROR 0x00FF0000
+
+HAL_StatusTypeDef led_init(TIM_HandleTypeDef* htim);
+HAL_StatusTypeDef led_blink(TIM_HandleTypeDef* htim, int32_t color, int16_t blink_period);
+
+#endif