raspberrypi/raspberrypi_zero/gpio/info_infrared.c

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2018-01-28 17:48:27 +08:00
#include <wiringPi.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
int main(int argc, char *argv[])
{
if(argc != 2) {
exit(0);
}
int pin = atol(argv[1]);
int status = 0;
wiringPiSetup();
//设置为输入模式
pinMode(pin, INPUT);
//很重要。控制默认情况下此PIN处于下拉低电平状态
pullUpDnControl(pin, PUD_DOWN);
/*
while(true)
{
delay(1000);
//读取当前pin的输入状态
if(digitalRead(pin) == 1) {
printf("There is somebody here\n");
}
else {
printf("There is no one here\n");
}
}
*/
status = digitalRead(pin);
printf("%d\n", status);
}