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53 lines
1.2 KiB
53 lines
1.2 KiB
// LED application in C by
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// Gerado Marx Chavez Campos, 26/04/2021
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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 LED3PATH "/sys/class/leds/beaglebone:green:usr3"
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#define bon "/brightness"
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#define trg "/trigger"
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//Function prototypes
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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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int main(int argc, char* argv[]){
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if(argc!=2){
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printf("Incorrect use of command...\n");
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printf("Please use LEDc with:\n");
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printf("on, off, flash or status.\n");
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printf("\n");
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printf("Example: LEDc on\n");
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return 2;
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}
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printf("Starting Application...\n");
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//checking the command argument:
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if(strcmp(argv[1], "on")==0){
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printf("Turning LED on\n");
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RemoveTrigger();
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WriteLED(bon,"1");
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}
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else if(strcmp(argv[1], "off")==0){
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printf("Turning LED off\n");
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RemoveTrigger();
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WriteLED(bon,"0");
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}
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printf("LED Application Done\n");
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return 0;
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}
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//complete functions here:
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void WriteLED(char filename[], char value[]){
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FILE* fp; //file pointer
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char fileName[100]; //var to store path and file
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sprintf(fileName, LED3PATH "%s", filename);
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fp = fopen(fileName, "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(trg, "none");
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}
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