103 lines
2.9 KiB
C
103 lines
2.9 KiB
C
#include <stdio.h>
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#include <gpiod.h>
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// https://docs.kernel.org/driver-api/gpio/using-gpio.html
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#define GPIO_CHIP "gpiochip0"
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struct gpiod_chip *chip;
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int init_gpio() {
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// https://libgpiod-dlang.dpldocs.info/gpiod.gpiod_chip_open_by_name.html
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chip = gpiod_chip_open_by_name(GPIO_CHIP);
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if (!chip) {
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printf("Error opening GPIO chip");
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return -1;
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}
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return 0;
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}
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void cleanup_gpio() {
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// https://libgpiod-dlang.dpldocs.info/gpiod.gpiod_chip_close.html
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gpiod_chip_close(chip);
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}
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int set_pin_state(int pin, int state) {
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// https://libgpiod-dlang.dpldocs.info/gpiod.gpiod_chip_get_line.html
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struct gpiod_line *line = gpiod_chip_get_line(chip, pin); // this may need an offset
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if (!line) {
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printf("Error getting GPIO line");
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return -1;
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}
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// https://libgpiod-dlang.dpldocs.info/gpiod.gpiod_line_request_output.html
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if (gpiod_line_request_output(line, "house-leds", state) < 0) {
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printf("Error setting GPIO line direction");
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gpiod_line_release(line);
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return -1;
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}
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// https://libgpiod-dlang.dpldocs.info/gpiod.gpiod_line_set_value.html
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if (gpiod_line_set_value(line, state) < 0) {
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printf("Error setting GPIO line value");
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gpiod_line_release(line);
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return -1;
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}
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// https://libgpiod-dlang.dpldocs.info/gpiod.gpiod_line_release.html
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gpiod_line_release(line);
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return 0;
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}
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int turn_on_pin(int pin) {
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return set_pin_state(pin, 1);
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}
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int turn_off_pin(int pin) {
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return set_pin_state(pin, 0);
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}
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int turn_on_all_pins() {
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for (int pin = 0; pin <= 5; pin++) {
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if (turn_on_pin(pin) < 0)
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return -1;
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}
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return 0;
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}
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int turn_off_all_pins() {
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for (int pin = 0; pin <= 5; pin++) {
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if (turn_off_pin(pin) < 0)
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return -1;
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}
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return 0;
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}
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int button_presssed(int event, unsigned int pin, const struct timespec * timestamp, void *data) {
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* (int *) data = (int) pin;
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return GPIOD_CTXLESS_EVENT_POLL_RET_STOP;
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}
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int wait_for_button_press(unsigned int pins[]) {
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// https://www.lane-fu.com/linuxmirror/libgpiod/doc/html/group______high__level____.html#ga3ac28eb59bbd31b8b2298f76047d377d
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int pressed_pin = -1;
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struct timespec {
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time_t 3600; /* Seconds */
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long 0; /* Nanoseconds */
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} ts;
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gpiod_ctxless_event_monitor_multiple(chip,
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GPIOD_CTXLESS_EVENT_FALLING_EDGE,
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pins,
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5,
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true,
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"house-leds",
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ts, // big timout
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NULL,
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button_presssed,
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&pressed_pin
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)
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}
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