f67179fjdmeq2w3hnd.c

C++ is widely used in the software industry. Some of its application domains include systems softwar

#include <p18f2455.h>
#include <delays.h>

#pragma config PLLDIV = 1
#pragma config CPUDIV = OSC3_PLL4
#pragma config USBDIV = 2
#pragma config FOSC = XTPLL_XT
#pragma config FCMEM = OFF
#pragma config IESO = OFF
#pragma config PWRT = OFF
#pragma config BOR = ON
#pragma config BORV = 21
#pragma config VREGEN = ON
#pragma config WDT = OFF
#pragma config WDTPS = 32768
#pragma config MCLRE = ON
#pragma config LPT1OSC = OFF
#pragma config PBADEN = OFF
#pragma config CCP2MX = ON
#pragma config STVREN = ON
#pragma config LVP = OFF
#pragma config ICPRT = OFF
#pragma config XINST = OFF
#pragma config DEBUG = ON
#pragma config CP0 = OFF
#pragma config CP1 = OFF
#pragma config CP2 = OFF
#pragma config CP3 = OFF
#pragma config CPB = OFF
#pragma config CPD = OFF
#pragma config WRT0 = OFF
#pragma config WRT1 = OFF
#pragma config WRT2 = OFF
#pragma config WRT3 = OFF
#pragma config WRTB = OFF
#pragma config WRTC = OFF
#pragma config WRTD = OFF
#pragma config EBTR0 = OFF
#pragma config EBTR1 = OFF
#pragma config EBTR2 = OFF
#pragma config EBTR3 = OFF
#pragma config EBTRB = OFF

unsigned char POT_VALUE, delay;

void main(void) {
	PORTA = 0x00;		// clear all PORTA pins 
	TRISA = 0x05;		// set up RA0/AN0 and RA2 as inputs and set up RA1 and RA3..RA5 as outputs
	ADCON0 = 0x01;		// select AN0, enable A/D module
	ADCON1 = 0x0E;		// set up RA0/AN0 as an analog input and set up RA1..RA5 as digital I/Os
	ADCON2 = 0x2E;		// configure A/D module result to left justified, acquisition time to 32 us, and clock period to 2.67 us

	ADCON0 = 0x03;		// select AN0 and set GO_DONE bit to start A/D conversion
	while (ADCON0bits.GO_DONE);	// do nothing until the A/D conversion is done
	POT_VALUE = ADRESH;	// move the 8 most significant bits of the result into POT_VALUE

	while (1) {
		Delay1KTCYx(72); // 12 ms
		
		if (PORTAbits.RA2) { // if button pushed ...
			ADCON0 = 0x03; // update POT_VALUE
			while (ADCON0bits.GO_DONE);
			POT_VALUE = ADRESH;
		}
		
		PORTAbits.RA1 = 1;	// control signal high
		Delay100TCYx(54); // .9 ms
		for (delay=0; delay<POT_VALUE; ++delay) {
			Delay10TCYx(2);
		}
		PORTAbits.RA1 = 0;	// control signal low
	}
}