#include <gpiod.h>
#include <time.h>

Include dependency graph for gpio.h:

This graph shows which files directly or indirectly include this file:

Macros
#define	GPIO_FHR1 30
	GPIO number for forcing I1 high.

#define	GPIO_FHR2 60
	GPIO number for forcing I2 high.

#define	GPIO_LED_STATUS 45
	GPIO number of status LED.

#define	GPIO_LED_ERROR 44
	GPIO number of error LED.

#define	GPIO_BUTTON 26
	GPIO number of start/stop button.

#define	GPIO_POWER 31
	GPIO number of RocketLogger cape power enable.

Typedefs
typedef enum gpio_mode	gpio_mode_t

typedef enum gpio_interrupt	gpio_interrupt_t

typedef struct gpiod_line	gpio_t

Enumerations
enum	gpio_mode { GPIO_MODE_IN , GPIO_MODE_OUT }

enum	gpio_interrupt { GPIO_INTERRUPT_NONE , GPIO_INTERRUPT_RISING , GPIO_INTERRUPT_FALLING , GPIO_INTERRUPT_BOTH }

Functions
int	gpio_init ()

void	gpio_deinit ()

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

gpio_t *	gpio_setup_interrupt (int gpio_number, gpio_interrupt_t edge, 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)

int	gpio_wait_interrupt (gpio_t gpio, const struct timespec timeout)

Macro Definition Documentation

◆ GPIO_BUTTON

#define GPIO_BUTTON 26

GPIO number of start/stop button.

Definition at line 47 of file gpio.h.

◆ GPIO_FHR1

#define GPIO_FHR1 30

GPIO number for forcing I1 high.

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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 39 of file gpio.h.

◆ GPIO_FHR2

#define GPIO_FHR2 60

GPIO number for forcing I2 high.

Definition at line 41 of file gpio.h.

◆ GPIO_LED_ERROR

#define GPIO_LED_ERROR 44

GPIO number of error LED.

Definition at line 45 of file gpio.h.

◆ GPIO_LED_STATUS

#define GPIO_LED_STATUS 45

GPIO number of status LED.

Definition at line 43 of file gpio.h.

◆ GPIO_POWER

#define GPIO_POWER 31

GPIO number of RocketLogger cape power enable.

Definition at line 49 of file gpio.h.

Typedef Documentation

◆ gpio_interrupt_t

typedef enum gpio_interrupt gpio_interrupt_t

GPIO interrupt edge definition

◆ gpio_mode_t

typedef enum gpio_mode gpio_mode_t

GPIO direction definition

◆ gpio_t

typedef struct gpiod_line gpio_t

GPIO type wrapper

Definition at line 72 of file gpio.h.

Enumeration Type Documentation

◆ gpio_interrupt

enum gpio_interrupt

GPIO interrupt edge definition

Enumerator
GPIO_INTERRUPT_NONE	No interrupt.
GPIO_INTERRUPT_RISING	Interrupt on rising edge.
GPIO_INTERRUPT_FALLING	Interrupt on falling edge.
GPIO_INTERRUPT_BOTH	Interrupt on both edges.

Definition at line 62 of file gpio.h.

◆ gpio_mode

enum gpio_mode

GPIO direction definition

Enumerator
GPIO_MODE_IN	GPIO read mode.
GPIO_MODE_OUT	GPIO write mode.

Definition at line 54 of file gpio.h.

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_number	Linux sysfs GPIO resource number
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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Macros

Typedefs

Enumerations

Functions

Macro Definition Documentation

◆ GPIO_BUTTON

◆ GPIO_FHR1

◆ GPIO_FHR2

◆ GPIO_LED_ERROR

◆ GPIO_LED_STATUS

◆ GPIO_POWER

Typedef Documentation

◆ gpio_interrupt_t

◆ gpio_mode_t

◆ gpio_t

Enumeration Type Documentation

◆ gpio_interrupt

◆ gpio_mode

Function Documentation

◆ gpio_deinit()

◆ gpio_get_value()

◆ gpio_init()

◆ gpio_release()

◆ gpio_set_value()

◆ gpio_setup()

◆ gpio_setup_interrupt()

◆ gpio_wait_interrupt()