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65 lines
1.2 KiB
65 lines
1.2 KiB
//This project turns on, off or toggle an LED
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#include<stdio.h>
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#include<stdlib.h>
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#include<string.h>
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#define LED3_PATH "/sys/class/leds/beaglebone:green:usr3"
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#define bled "/brightness"
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#define tled "/trigger"
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//Protypes:
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void writeLED(char fileName[], char value[]);
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void removeTrigger();
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//main:
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////////////////////////////////////////////////////////
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int main(int argc, char* argv[]){
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printf("Starting app \n");
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if(argc!=2){
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printf("Incorrect number of arguments");
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return 2;
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}
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if(strcmp(argv[1], "on")==0){
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printf("LED on \n");
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removeTrigger();
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writeLED(bled, "1");
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printf("Done");
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}
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else if (strcmp(argv[1], "off")==0){
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printf("LED off \n");
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removeTrigger();
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writeLED(bled, "0");
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printf("Done");
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}
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else if (strcmp(argv[1], "blink")==0){
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printf("LED blinking \n");
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writeLED(tled, "timer");
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writeLED("/delay_on", "500");
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writeLED("/delay_off", "500");
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}
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else
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printf("Invalid command!\n");
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return 0;
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}
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////////////////////////////////////////////////////////
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void writeLED(char fileName[], char value[]){
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FILE* fp;
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char fullName[150];
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sprintf(fullName, LED3_PATH "%s", fileName);
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fp = fopen(fullName, "w+");
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fprintf(fp, "%s", value);
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fclose(fp);
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}
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void removeTrigger(){
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writeLED(tled, "none");
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}
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