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1、PIC单片机如何实现单按键输入LED灯点亮IO输出和输入/*按键连接RB1，点亮LED，PORTA RA0控制输出。按一次点亮，再按一次熄灭，如此循环。RB外接上拉电阻。*/#include#define uchar unsigned char#define uint unsigned int/ CONFIG#pragma config FOSC = HS /#pragma config WDTE = OFF / Watchdog Timer Enable bit （WDT disabled）#pragma config PWRTE = OFF / Power-up TImer Enable
2、bit （PWRT disabled）#pragma config BOREN = ON / Brown-out Reset Enable bit （BOR enabled）#pragma config LVP = ON / Low-Voltage （Single-Supply） In-Circuit Serial Programming Enable bit （RB3/PGM pin has PGM funcTIon; low-voltage programming enabled）#pragma config CPD = OFF / Data EEPROM Memory Code Prot
3、ecTIon bit （Data EEPROM code protecTIon off）#pragma config WRT = OFF / Flash Program Memory Write Enable bits （Write protection off; all program memory may be written to by EECON control）#pragma config CP = OFF / Flash Program Memory Code Protection bit （Code protection off）uchar count;void delay（ui
4、nt x）uint y，z;for（y=x;y0;y-）for（z=25;z0;z-）;void Init_GPIO（）TRISA = 0X00; / RA0 output directionPORTA=0X00;TRISB = 0x02; / RB1 inputPORTB = 0x00;void Keyscan（）/temp = PORTBif（RB1=0）delay（200）; / delay time 根据机械按键的抖动情况调整，if（RB1=0）count+;void main（void）count = 0;Init_GPIO（）;while（1）Keyscan（）;if（count%2）=1）PORTA=0x01;elsePORTA = 0x00;