rgbpwm.c

rgb led hi tech c learning file

/* RGB PWM Channels */
int led1Dir[3] = { -1,1,-1 };
int led2Dir[3] = { 1,-1,-1 };
int led3Dir[3] = { -1,1,1 };

unsigned char led1Duty[3] = { 100,20,100 };
unsigned char led2Duty[3] = { 10,130,200 };
unsigned char led3Duty[3] = { 80,100,20 };

unsigned char led1Pin[3] = { 0, 1, 2 }; /* RB0, RB1, RB2 */
unsigned char led2Pin[3] = { 5, 6, 7 }; /* RB5, RB6, RB7 */
unsigned char led3Pin[3] = { 0, 1, 2 }; /* RA0, RA1, RA2 */

unsigned char timerTick=0;

unsigned char doPwm(unsigned char pwmDuty[], unsigned char pwmPin[]) {
	unsigned char i;
	for(i=0;i<3;i++) {
		if(timerTick == 0 && pwmDuty[i] != 0) {             // reset at start.
			pwmPin[i] = 0;			
			// resBit(pShadow, pwmPin[i]); 
		} else if(timerTick == pwmDuty[i] && pwmDuty[i] != 255) { // set at duty.
			//setBit(pShadow, pwmPin[i]); 
			pwmPin[i] = 1;
		}
	}
	return 0;
}

static void Intr(void) interrupt 0 { /* interrupt service routine */
	unsigned char i;
	GIE=0;
	if(T0IF) {
		doPwm(led1Duty,led1Pin);
		doPwm(led2Duty,led2Pin);
		doPwm(led3Duty,led3Pin); 
		timerTick++;
		if(timerTick >= 254) {
			timerTick=0;
			for(i=0;i<3;i++) {
				led1Duty[i] += led1Dir[i];
				if((led1Duty[i] <= 0)||(led1Duty[i] >= 255)) {
					led1Dir[i] = led1Dir[i]*-1;
				}
				led2Duty[i] += led2Dir[i];
				if((led2Duty[i] <= 0)||(led2Duty[i] >= 255)) {
					led2Dir[i] = led2Dir[i]*-1;
				}
				led3Duty[i] += led3Dir[i];
				if((led3Duty[i] <= 0)||(led3Duty[i] >= 255)) {
					led3Dir[i] = led3Dir[i]*-1;
				} 
			}
		}
		TMR0 = 0xE0; 
		T0IF = 0;
	}
}but i need to find any way to switch port's pins faster. First proposal is good