38 lines
727 B
C
38 lines
727 B
C
|
#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);
|
||
|
|
|
||
|
|
}
|