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gpiod_callback.c
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gpiod_callback.c
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/*
* ******************************************************************
* ZYNTHIAN PROJECT: libgpiod callbacks
*
* Implements a callback mechanism for libgpiod
*
* Copyright (C) 2015-2024 Fernando Moyano <[email protected]>
*
* ******************************************************************
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* For a full copy of the GNU General Public License see the LICENSE.txt file.
*
* ******************************************************************
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <gpiod.h>
#include <pthread.h>
#include "gpiod_callback.h"
//-------------------------------------------------------------------
// Variables
//-------------------------------------------------------------------
// GPIO Chip Data Structure
struct gpiod_chip *gpio_chip = NULL;
// Array of callback structures
struct gpiod_callback rpi_gpiod_callbacks[NUM_GPIO_PINS];
// Bulk structure for callback lines
struct gpiod_line_bulk cb_line_bulk;
int end_callback_thread_flag = 0;
pthread_t callback_thread_tid;
//-------------------------------------------------------------------
// Pin number conversion arrays
//-------------------------------------------------------------------
// WiringPi => GPIO number (BCM)
int8_t wpi2gpio[32] = {
17, // 0
18, // 1
27, // 2
22, // 3
23, // 4
24, // 5
25, // 6
4, // 7
2, // 8
3, // 9
8, // 10
7, // 11
10, // 12
9, // 13
11, // 14
14, // 15
15, // 16
-1, // 17
-1, // 18
-1, // 19
-1, // 20
5, // 21
6, // 22
13, // 23
19, // 24
26, // 25
12, // 26
16, // 27
20, // 28
21, // 29
0, // 30
1 // 31
};
// GPIO number (BCM) => WiringPi
int8_t gpio2wpi[28] = {
30, // 0
31, // 1
8, // 2
9, // 3
7, // 4
21, // 5
22, // 6
11, // 7
10, // 8
13, // 9
12, // 10
14, // 11
26, // 12
23, // 13
15, // 14
16, // 15
27, // 16
0, // 17
1, // 18
24, // 19
28, // 20
29, // 21
3, // 22
4, // 23
5, // 24
6, // 25
25, // 26
2 // 27
};
//-------------------------------------------------------------------
// Initialization & functions
//-------------------------------------------------------------------
int gpiod_init_callbacks() {
int i;
// Initialize GPIOD callback data structures
for (i=0; i<NUM_GPIO_PINS; i++) {
rpi_gpiod_callbacks[i].pin = -1;
rpi_gpiod_callbacks[i].line = NULL;
rpi_gpiod_callbacks[i].callback = NULL;
}
// Determine the GPIO chip to use and initialize it
char * gpio_chip_device = getenv ("GPIO_CHIP_DEVICE");
if (!gpio_chip_device) gpio_chip_device = DEFAULT_GPIO_CHIP_DEVICE;
gpio_chip = gpiod_chip_open(gpio_chip_device);
if (!gpio_chip) {
fprintf(stderr, "ZynCore->gpiod_init_callbacks(): Can't open RPI's GPIO chip: %s\n", gpio_chip_device);
gpio_chip = NULL;
return 0;
}
return 1;
}
int gpiod_line_register_callback(struct gpiod_line *line, void (*callback)(void)) {
if (line) {
int pin = gpiod_line_offset(line);
rpi_gpiod_callbacks[pin].pin = pin;
rpi_gpiod_callbacks[pin].line = line;
rpi_gpiod_callbacks[pin].callback = callback;
//fprintf(stderr, "ZynCore->gpiod_line_register_callback(): Registered callback on pin %d\n", pin);
return 1;
}
return 0;
}
int gpiod_line_unregister_callback(struct gpiod_line *line) {
if (line) {
int pin = gpiod_line_offset(line);
rpi_gpiod_callbacks[pin].pin = -1;
rpi_gpiod_callbacks[pin].line = NULL;
rpi_gpiod_callbacks[pin].callback = NULL;
return 1;
}
return 0;
}
void * gpiod_callbacks_thread(void *arg) {
end_callback_thread_flag = 0;
struct timespec ts = { 1, 0 };
struct gpiod_line_bulk event_bulk;
struct gpiod_line *line;
struct gpiod_line_event event;
int ret = 0;
int pin;
int i;
while (!end_callback_thread_flag) {
ret = gpiod_line_event_wait_bulk(&cb_line_bulk, &ts, &event_bulk);
if (ret > 0) {
for (i=0; i<event_bulk.num_lines; i++) {
line = event_bulk.lines[i];
gpiod_line_event_read(line, &event);
pin = gpiod_line_offset(line);
//if (event.event_type == GPIOD_LINE_EVENT_RISING_EDGE)
// fprintf(stderr,"ZynCore->gpiod_callback_thread(): Got event on pin '%d'!\n", pin);
rpi_gpiod_callbacks[pin].callback();
}
} else if (ret < 0) {
fprintf(stderr, "ZynCore->gpiod_callback_thread(): Error while processing GPIO events!\n");
break;
} else {
//fprintf(stderr, "ZynCore->gpiod_callback_thread(): Event loop timeout...\n");
}
}
fprintf(stderr, "ZynCore->gpiod_callback_thread(): Finished succesfully\n");
}
int gpiod_start_callbacks() {
int i, count;
gpiod_line_bulk_init(&cb_line_bulk);
for (i=0, count=0; i<NUM_GPIO_PINS; i++) {
struct gpiod_line *line = rpi_gpiod_callbacks[i].line;
if (line) {
gpiod_line_bulk_add(&cb_line_bulk, line);
count++;
}
}
if (count > 0) {
// Start callback thread
int err = pthread_create(&callback_thread_tid, NULL, &gpiod_callbacks_thread, NULL);
if (err != 0) {
fprintf(stderr, "ZynCore->gpiod_start_callbacks: Can't create callback thread :[%s]", strerror(err));
return 0;
} else {
fprintf(stderr, "ZynCore->gpiod_start_callbacks: Callback thread created successfully\n");
return 1;
}
}
return 0;
}
int gpiod_stop_callbacks() {
end_callback_thread_flag = 1;
return 1;
}
int gpiod_restart_callbacks() {
gpiod_stop_callbacks();
return gpiod_start_callbacks();
}
//-------------------------------------------------------------------