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fixes wait_for_button_press function, WIP

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This commit is contained in:
Fabian Montero 2023-09-11 03:33:57 -06:00
parent ef16376aba
commit 404097a13d
Signed by: fabian
GPG key ID: 1FFAC35E1798174F
1 changed files with 28 additions and 28 deletions
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56
pin_control/pin_control.c
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@ -1,6 +1,8 @@
#include <stdio.h>
#include <gpiod.h>
// https://docs.kernel.org/driver-api/gpio/using-gpio.html
#define GPIO_CHIP "gpiochip0"
struct gpiod_chip *chip;
@ -47,27 +49,6 @@ int set_pin_state(int pin, int state) {
return 0;
}
int read_button(int pin) {
// https://libgpiod-dlang.dpldocs.info/gpiod.gpiod_chip_get_line.html
struct gpiod_line *line = gpiod_chip_get_line(chip, pin + PIN_OFFSET);
if (!line) {
printf("Error getting GPIO line");
return -1;
}
// https://libgpiod-dlang.dpldocs.info/gpiod.gpiod_line_request_input.html
if (gpiod_line_request_input(line, "house-leds") < 0) {
printf("Error setting GPIO line direction to input");
gpiod_line_release(line);
return -1;
}
// https://libgpiod-dlang.dpldocs.info/gpiod.gpiod_line_get_value.html
int value = gpiod_line_get_value(line);
gpiod_line_release(line);
return value; // either 0 or 1
}
int turn_on_pin(int pin) {
return set_pin_state(pin, 1);
}
@ -92,11 +73,30 @@ int turn_off_all_pins() {
return 0;
}
int wait_for_button_press(int button_pin) {
while (1) {
int button_state = read_button(button_pin); // maybe make it so that this works with a range of pins instead of just one
if (button_state == 1) {
return button_pin;
}
}
int button_presssed(int event, unsigned int pin, const struct timespec * timestamp, void *data) {
* (int *) data = (int) pin;
return GPIOD_CTXLESS_EVENT_POLL_RET_STOP;
}
int wait_for_button_press(unsigned int pins[]) {
// https://www.lane-fu.com/linuxmirror/libgpiod/doc/html/group______high__level____.html#ga3ac28eb59bbd31b8b2298f76047d377d
int pressed_pin = -1;
struct timespec {
time_t 3600; /* Seconds */
long 0; /* Nanoseconds */
} ts;
gpiod_ctxless_event_monitor_multiple(chip,
GPIOD_CTXLESS_EVENT_FALLING_EDGE,
pins,
5,
true,
"house-leds",
ts, // big timout
NULL,
button_presssed,
&pressed_pin
)
}