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