60 lines
980 B
C
60 lines
980 B
C
/*
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* 霍尔元件
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*
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*/
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#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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#include <string.h>
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int is_num(int n, char *argv[])
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{
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int j = 0;
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int i;
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char parameter[10];
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strcpy(parameter, argv[n]);
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int len = strlen(parameter);
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for (i = 0; i < len; i++) {
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if (parameter[i] <= 57 && parameter[i] >= 48) //0~9的ASCII码是48~57
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{
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j++;
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}
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}
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if (j == len) {
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return 1;
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} else {
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return 0;
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}
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}
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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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printf("Parameter error.\n");
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exit(1);
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}
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if (is_num(1, argv) == 0) {
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printf("Parameter error, parameter 1 is PIN pin value\n");
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exit(1);
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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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pinMode(pin, INPUT);
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//pullUpDnControl(pin, PUD_DOWN);
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status = digitalRead(pin);
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printf("%d\n", status);
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return status;
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}
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