commit 4ab95c1da96078adda09aa32f78c7da3a326d2fc
Author: Jan Mrna <mj370@protonmail.com>
Date:   Sun Jun 12 22:44:26 2022 +0200

    Added files

diff --git a/rgbled.c b/rgbled.c
new file mode 100644
index 0000000..af24f58
--- /dev/null
+++ b/rgbled.c
@@ -0,0 +1,76 @@
+/*
+ * rgbled.c
+ *
+ *  Created on: Nov 11, 2021
+ *      Author: dooku
+ */
+
+#include "rgbled.h"
+
+static rgbled_context_t *rgbled_context;
+static uint8_t rgbled_intensity = RGBLED_MAX_INTENSITY; /* LED intensity from 0 (off) to RGBLED_MAX_INTENSITY (full power) */
+
+int8_t rgbled_init(rgbled_context_t *context)
+{
+	if (context == NULL) {
+		return RGBLED_ERROR;
+	}
+	rgbled_context = context;
+
+	return RGBLED_OK;
+}
+
+int8_t rgbled_set_color(uint8_t R, uint8_t G, uint8_t B)
+{
+	uint8_t colors[3];
+	uint8_t i;
+
+	colors[0] = (uint32_t)R * rgbled_intensity / RGBLED_MAX_INTENSITY;
+	colors[1] = (uint32_t)G * rgbled_intensity / RGBLED_MAX_INTENSITY;
+	colors[2] = (uint32_t)B * rgbled_intensity / RGBLED_MAX_INTENSITY;
+	for (i = 0; i < 3; i++) {
+		if (colors[i] > RGBLED_PERIOD) {
+			return RGBLED_ERROR;
+		}
+	}
+	for (i = 0; i < 3; i++) {
+		switch (rgbled_context->channel_array[i]) {
+		case 1:
+			LL_TIM_OC_SetCompareCH1(rgbled_context->timer_array[i], (uint32_t)(RGBLED_PERIOD - colors[i]));
+			break;
+		case 2:
+			LL_TIM_OC_SetCompareCH2(rgbled_context->timer_array[i], (uint32_t)(RGBLED_PERIOD - colors[i]));
+			break;
+		case 3:
+			LL_TIM_OC_SetCompareCH3(rgbled_context->timer_array[i], (uint32_t)(RGBLED_PERIOD - colors[i]));
+			break;
+		case 4:
+			LL_TIM_OC_SetCompareCH4(rgbled_context->timer_array[i], (uint32_t)(RGBLED_PERIOD - colors[i]));
+			break;
+		default:
+			return RGBLED_WRONG_CHANNEL;
+		}
+	}
+	return RGBLED_OK;
+}
+
+int8_t rgbled_set_intensity(uint8_t intensity)
+{
+	if (intensity > RGBLED_MAX_INTENSITY) {
+		return RGBLED_ERROR;
+	}
+	rgbled_intensity = intensity;
+}
+
+int8_t rgbled_get_intensity(uint8_t *intensity)
+{
+	if (intensity == NULL) {
+		return RGBLED_ERROR;
+	}
+	*intensity = rgbled_intensity;
+}
+
+int8_t rgbled_off(void)
+{
+	rgbled_set_color(RGBLED_OFF);
+}
diff --git a/rgbled.h b/rgbled.h
new file mode 100644
index 0000000..1f78d53
--- /dev/null
+++ b/rgbled.h
@@ -0,0 +1,81 @@
+/*
+ * rgbled.h
+ *
+ *  Created on: Nov 11, 2021
+ *      Author: dooku
+ */
+
+#ifndef INC_RGBLED_H_
+#define INC_RGBLED_H_
+
+#include "stm32l0xx_ll_tim.h"
+#include "stddef.h"
+
+/*
+ * Return values for I2C functions
+ */
+
+#define RGBLED_OK 0
+#define RGBLED_ERROR -1 // generic error
+#define RGBLED_WRONG_CHANNEL -2 // channel number not in {1,2,3,4}
+
+/*
+ * Defaults used for LL timer (PWM) initialization
+ */
+
+#define RGBLED_PRESCALER 0
+#define RGBLED_PERIOD 255
+#define RGBLED_MAX_INTENSITY 100
+
+/*
+ * Shorthands for colors
+ */
+
+#define RGBLED_RED     255,0,0
+#define RGBLED_GREEN   0,255,0
+#define RGBLED_BLUE    0,0,255
+#define RGBLED_WHITE   255,255,255
+#define RGBLED_YELLOW  255,255,0
+#define RGBLED_OFF     0,0,0
+#define RGBLED_MAGENTA 255,0,255
+
+/*
+ * Type definitions
+ */
+
+typedef struct {
+	// tim2 ch1 B
+	// tim22 ch1 G
+	// tim22 ch2 R
+	// TODO union, aby se dalo nastavovat LED v cyklu (set_color)
+	union {
+		struct {
+			TIM_TypeDef *R;
+			TIM_TypeDef *G;
+			TIM_TypeDef *B;
+		} timer;
+		TIM_TypeDef *timer_array[3];
+	};
+	union {
+		struct {
+			uint8_t R;
+			uint8_t G;
+			uint8_t B;
+		} channel;
+		uint8_t channel_array[3];
+	};
+
+} rgbled_context_t;
+
+/*
+ * Function declarations
+ */
+
+int8_t rgbled_init(rgbled_context_t *context);
+int8_t rgbled_set_color(uint8_t R, uint8_t G, uint8_t B);
+int8_t rgbled_set_intensity(uint8_t intensity);
+int8_t rgbled_get_intensity(uint8_t *intensity);
+int8_t rgbled_off(void);
+
+
+#endif /* INC_RGBLED_H_ */