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32 lines
923 B
32 lines
923 B
#include "common/gpio.h"
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#include <fcntl.h>
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#include <unistd.h>
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#include <cstring>
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#include "common/util.h"
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// We assume that all pins have already been exported on boot,
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// and that we have permission to write to them.
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int gpio_init(int pin_nr, bool output) {
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char pin_dir_path[50];
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int pin_dir_path_len = snprintf(pin_dir_path, sizeof(pin_dir_path),
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"/sys/class/gpio/gpio%d/direction", pin_nr);
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if(pin_dir_path_len <= 0) {
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return -1;
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}
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const char *value = output ? "out" : "in";
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return util::write_file(pin_dir_path, (void*)value, strlen(value));
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}
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int gpio_set(int pin_nr, bool high) {
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char pin_val_path[50];
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int pin_val_path_len = snprintf(pin_val_path, sizeof(pin_val_path),
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"/sys/class/gpio/gpio%d/value", pin_nr);
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if(pin_val_path_len <= 0) {
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return -1;
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}
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return util::write_file(pin_val_path, (void*)(high ? "1" : "0"), 1);
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}
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