#ifndef APA102_H
#define APA102_H

#include <avr/io.h>
#include "mystd.h"
#include "spi.h"

typedef struct rgb {
		uint8_t r;
		uint8_t g;
		uint8_t b;
} rgb;

static inline void apa102_set_colors(rgb col[], uint8_t brightness[], uint8_t length) {
	// start frame
	for (uint8_t i = 0; i < 4; i++)
		spi_write(0x00);
	// led data
	for (uint8_t i = 0; i < length; i++) {
		spi_write(0xE0 + (brightness[i] & 31));
		spi_write(col[i].b);
		spi_write(col[i].g);
		spi_write(col[i].r);
	}

	// reset frame
	for (uint8_t i = 0; i < 4; i++)
		spi_write(0x00);

	// End frame: 8+8*(leds >> 4) clock cycles
	for (uint8_t i = 0; i < length; i += 16) {
		spi_write(0x00);  // 8 more clock cycles
	}
}

static inline void apa102_set_color(rgb col, uint8_t brightness) {
	apa102_set_colors(&col, &brightness, 1);
}

#endif /* APA102_H */