myc.c

pic单片机的C语言开发实例程序

/*HI-TECH PICC Quick Start Guide 25*/
#include<pic.h>
/*
* Demo program - flashes LEDs on
* Port B, responds to switch press
* on RA1. Usable on PICDEM board.
*/
#define PORTBIT(adr, bit) ((unsigned)(&adr)*8+(bit))
static bit button @ PORTBIT(PORTA, 1);
main(void)
{
unsigned i;
unsigned char j;
TRISB = 0;  /* all bits output */
j = 0;
for(;;) {
PORTB = 0x00; /* turn all on */
for(i = 16000 ; --i; ){;}
//continue;
PORTB = ~j; /* output value of j */
for(i = 16000 ; --i ;){;}
//continue;
if(button == 0) /* if switch pressed, increment */
j++;
}
}