#include <errno.h>
#include <stdint.h>
#include <string.h>
#include <gpiod.h>
#include <time.h>
#include <unistd.h>
#include "log.h"
#include "rl.h"
#include "gpio.h"

Include dependency graph for gpio.c:

Macros
#define	GPIO_CHIP_COUNT 4
	Number of GPIO chips.

#define	GPIO_LINES_PER_CHIP 32
	Number of GPIO lines per GPIO chip.

#define	GPIO_DEBOUNCE_DELAY_US 50
	Minimal time a button needs to be pressed (in microseconds)

Functions
int	gpio_init ()

void	gpio_deinit ()

gpio_t *	gpio_setup (int gpio_number, gpio_mode_t mode, const char *name)

void	gpio_release (gpio_t *gpio)

int	gpio_set_value (gpio_t *gpio, int value)

int	gpio_get_value (gpio_t *gpio)

gpio_t *	gpio_setup_interrupt (int gpio_number, gpio_interrupt_t edge, const char *name)

int	gpio_wait_interrupt (gpio_t gpio, const struct timespec timeout)

Variables
struct gpiod_chip *	gpio_chip [GPIO_CHIP_COUNT] = {NULL}

Macro Definition Documentation

◆ GPIO_CHIP_COUNT

#define GPIO_CHIP_COUNT 4

Number of GPIO chips.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Definition at line 46 of file gpio.c.

Referenced by gpio_deinit(), and gpio_init().

◆ GPIO_DEBOUNCE_DELAY_US

#define GPIO_DEBOUNCE_DELAY_US 50

Minimal time a button needs to be pressed (in microseconds)

Definition at line 52 of file gpio.c.

Referenced by gpio_wait_interrupt().

◆ GPIO_LINES_PER_CHIP

#define GPIO_LINES_PER_CHIP 32

Number of GPIO lines per GPIO chip.

Definition at line 49 of file gpio.c.

Function Documentation

◆ gpio_deinit()

void gpio_deinit ( )

Denitialize GPIO module.

Note: release any used GPIO pin first.

Definition at line 92 of file gpio.c.

References gpio_chip, and GPIO_CHIP_COUNT.

Referenced by hw_deinit(), and main().

◆ gpio_get_value()

int gpio_get_value ( gpio_t * gpio )

Get the GPIO value.

Parameters

gpio	GPIO resource to get the value

Returns: The read GPIO value, negative on failure with errno set accordingly

Definition at line 146 of file gpio.c.

◆ gpio_init()

int gpio_init ( )

Initialize GPIO module.

Returns: Returns 0 on success, negative on failure with errno set accordingly

Definition at line 77 of file gpio.c.

References ERROR, gpio_chip, GPIO_CHIP_COUNT, rl_log(), RL_LOG_ERROR, and SUCCESS.

Referenced by hw_init(), and main().

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◆ gpio_release()

void gpio_release ( gpio_t * gpio )

Release an aquired GPIO resource.

Parameters

gpio	The GPIO resource to release

Definition at line 130 of file gpio.c.

Referenced by hw_deinit(), and main().

◆ gpio_set_value()

int gpio_set_value	(	gpio_t *	gpio,
		int	value )

Set the GPIO value.

Parameters

gpio	GPIO resource to set the output value
value	GPIO state to set (0 or 1)

Returns: Returns 0 on success, negative on failure with errno set accordingly

Definition at line 135 of file gpio.c.

References ERROR.

Referenced by hw_deinit(), hw_init(), hw_sample(), and main().

◆ gpio_setup()

gpio_t * gpio_setup	(	int	gpio_number,
		gpio_mode_t	mode,
		const char *	name )

Set up a specific GPIO pin for input/output.

Note: need to initialize GPIO module first.

Parameters

gpio_number	Resource number of the GPIO to set up
mode	GPIO mode (input or output) to configure
name	Name to label the set up GPIO

Returns: Returns GPIO resource on success, NULL on failure with errno set accordingly

Definition at line 103 of file gpio.c.

References GPIO_MODE_IN, GPIO_MODE_OUT, rl_log(), and RL_LOG_ERROR.

Referenced by hw_init(), and main().

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◆ gpio_setup_interrupt()

gpio_t * gpio_setup_interrupt	(	int	gpio_number,
		gpio_interrupt_t	edge,
		const char *	name )

Set up a specific GPIO pin for interrupt event.

Parameters

gpio_number	Resource number of the GPIO to set up
edge	GPIO interrupt edge to configure
name	Name to label the set up GPIO

Returns: Returns GPIO resource on success, NULL on failure with errno set accordingly

Definition at line 148 of file gpio.c.

References GPIO_INTERRUPT_BOTH, GPIO_INTERRUPT_FALLING, GPIO_INTERRUPT_NONE, GPIO_INTERRUPT_RISING, rl_log(), and RL_LOG_ERROR.

Referenced by main().

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◆ gpio_wait_interrupt()

int gpio_wait_interrupt	(	gpio_t *	gpio,
		const struct timespec *	timeout )

Wait for interrupt on GPIO pin.

Parameters

gpio	GPIO resource to wait for
timeout	Pointer to timeout timespec, NULL for infinite timeout

Returns: Returns the GPIO pin value (0 or 1) on success, negative on failure with errno set accordingly

Definition at line 187 of file gpio.c.

References ERROR, GPIO_DEBOUNCE_DELAY_US, rl_log(), and RL_LOG_ERROR.

Referenced by main().

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Variable Documentation

◆ gpio_chip

struct gpiod_chip* gpio_chip[GPIO_CHIP_COUNT] = {NULL}

Definition at line 54 of file gpio.c.

Referenced by gpio_deinit(), and gpio_init().

Macros

Functions

Variables

Macro Definition Documentation

◆ GPIO_CHIP_COUNT

◆ GPIO_DEBOUNCE_DELAY_US

◆ GPIO_LINES_PER_CHIP

Function Documentation

◆ gpio_deinit()

◆ gpio_get_value()

◆ gpio_init()

◆ gpio_release()

◆ gpio_set_value()

◆ gpio_setup()

◆ gpio_setup_interrupt()

◆ gpio_wait_interrupt()

Variable Documentation

◆ gpio_chip