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97 lines
1.6 KiB
C
97 lines
1.6 KiB
C
//Leonardo Mendoza 26-sep-2026
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#include <stdio.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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//Prototypes
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int gpio_export(const char *gpio);
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int gpio_direction(int gpio, const char *direction);
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int gpio_write(int gpio, int value);
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int main(int argc, char *argv[])
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{
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char pin[] = "17";
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gpio_export(pin);
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int fd;
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// DIRECTION
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fd = open("/sys/class/gpio/chip0/gpio17/direction", O_WRONLY);
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if(fd<0)
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{
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perror("Error opening GPIO path");
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return -1;
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}
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write(fd, "out",3);
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close(fd);
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// VALUE
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fd = open("/sys/class/gpio/chip0/gpio17/value", O_WRONLY);
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if(fd<0)
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{
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perror("Error opening GPIO path");
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return -1;
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}
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write(fd, "1", 1);
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close(fd);
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sleep(1);
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// Unexport
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fd = open("/sys/class/gpio/chip0/gpio17/value", O_WRONLY);
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if(fd<0)
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{
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perror("Error opening GPIO path");
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return -1;
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}
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write(fd, "0", 1);
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close(fd);
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sleep(1);
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fd = open("/sys/class/gpio/chip0/gpio17/value", O_WRONLY);
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if(fd<0)
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{
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perror("Error opening GPIO path");
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return -1;
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}
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write(fd, "1", 1);
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close(fd);
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sleep(1);
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fd = open("/sys/class/gpio/chip0/gpio17/unexport", O_WRONLY);
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if(fd<0)
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{
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perror("Error opening GPIO path");
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return -1;
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}
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write(fd, "17", 2);
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close(fd);
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printf("Number of arguments: %d\n", argc);
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printf("Program is reciving: %s\n", argv[0]);
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if (argc > 1)
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{
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printf("Argument: %s\n", argv[1]);
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}
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return 0;
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}
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//Full functions
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int gpio_export(const char *gpio)
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{
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int fd;
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// EXPORT
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fd = open("/sys/class/gpio/chip0/export", O_WRONLY);
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if(fd<0)
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{
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perror("Error opening GPIO export path");
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return -1;
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}
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write(fd, gpio, strlen(gpio));
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close(fd);
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return 0;
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}
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