/**
 * Create our rgb structure and declare it below as a global
 */
typedef struct {
	unsigned char red;
	unsigned char green;
	unsigned char blue;
} rgb;
rgb channels = { 255, 0, 0 };

/**
 * RGB Rainbow sequencing function. 100% dependent on clock speed.
 * Alternative to including math.h and using sin(), as doubles and floats
 * increase the size of the compiled avr firmware.
 */
void rainbow_sequence(void) {
	//Fade from blue to red
	if(channels.blue > 0 && channels.red == 255 && channels.green == 0) {
		channels.blue--;
	}
	if(channels.blue == 255 && channels.red < 255 && channels.green == 0) {
		channels.red++;
	}
	
	//Fade from green to blue
	if(channels.green > 0 && channels.blue == 255 && channels.red == 0) {
		channels.green--;
	}
	if(channels.green == 255 && channels.blue < 255 && channels.red == 0) {
		channels.blue++;
	}
	
	// Fade from red to green
	if(channels.red > 0 && channels.green == 255 && channels.blue == 0) {
		channels.red--;
	}
	if(channels.red == 255 && channels.green < 255 && channels.blue == 0) {
		channels.green++;
	}
}