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gpio: work done to export,read,write to gpio

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Signed-off-by: Thomas Ingleby <thomas.c.ingleby@intel.com>
This commit is contained in:
Thomas Ingleby
2014-04-11 11:41:48 +01:00
parent 5168538894
commit aa2ed728be
1 changed files with 36 additions and 1 deletions
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37
src/gpio/gpio.c
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@@ -24,6 +24,9 @@
*/
#include <stdlib.h>
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include "gpio.h"
@@ -33,6 +36,18 @@ extern "C" {
void
gpio_init(gpio_t *gpio, int pin) {
FILE *export_f;
if((export_f = fopen("/sys/class/gpio/export", "w")) == NULL) {
fprintf(stderr, "Failed to open export for writing!\n");
} else {
fprintf(export_f, "%d", pin);
fclose(export_f);
char bu[64];
sprintf(bu, "/sys/class/gpio/gpio%d/value", pin);
gpio->value_fp = fopen(bu, "r+b");
}
gpio->pin = pin;
}
@@ -49,16 +64,36 @@ gpio_mode(gpio_t *gpio, gpio_mode_t mode) {
void
gpio_dir(gpio_t *gpio, gpio_dir_t dir) {
char filepath[64];
snprintf(filepath, 64, "/sys/class/gpio/gpio%d/direction", gpio->pin);
int fd;
fd = open(filepath, O_WRONLY);
if(fd == -1) {
fprintf(stderr, "Failed to open direction for writing!\n");
} else if(write(fd, dir, 5) == -1) {
fprintf(stderr, "Failed to set direction\n");
} else {
close(fd);
}
}
int
gpio_read(gpio_t *gpio) {
return 0;
fseek(gpio->value_fp, SEEK_SET, 0);
char buffer[2];
fread(buffer, 2, 1, gpio->value_fp);
return atoi(buffer);
}
void
gpio_write(gpio_t *gpio, int value){
fseek(gpio->value_fp, SEEK_SET, 0);
fprintf(gpio->value_fp, "%d", value);
}
void
gpio_close(gpio_t *gpio) {
}