#include <arch/arm.h>
#include <stdlib.h>
#include <string.h>
#include <dev/gpio.h>

Include dependency graph for gpio_at91.c:

Functions
int	GpioPinGet (int bank, int bit)
	Get pin level.
void	GpioPinSetLow (int bank, int bit)
	Set pin level to low.
void	GpioPinSetHigh (int bank, int bit)
	Set pin level to high.
void	GpioPinSet (int bank, int bit, int value)
	Set pin level.
unsigned int	GpioPortGet (int bank)
	Get all pin levels of a specified bank/port.
void	GpioPortSetLow (int bank, unsigned int mask)
	Set multiple pin levels of a bank/port to low.
void	GpioPortSetHigh (int bank, unsigned int mask)
	Set multiple pin levels of a bank/port to high.
void	GpioPortSet (int bank, unsigned int value)
	Set all pin levels of a bank/port.
uint32_t	GpioPinConfigGet (int bank, int bit)
	Get pin configuration.
int	GpioPortConfigSet (int bank, unsigned int mask, uint32_t flags)
	Set port wide pin configuration.
int	GpioPinConfigSet (int bank, int bit, uint32_t flags)
	Set pin configuration.
int	GpioRegisterIrqHandler (GPIO_SIGNAL sig, int bit, void(handler)(void ), void arg)
	Register a GPIO pin interrupt handler.
int	GpioIrqEnable (GPIO_SIGNAL *sig, int bit)
	Enable a specified GPIO interrupt.
int	GpioIrqDisable (GPIO_SIGNAL *sig, int bit)
	Disable a specified GPIO interrupt.

Function Documentation

int GpioPinGet	(	int	bank,
		int	bit
	)

Get pin level.

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

1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. 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. 3. Neither the name of the copyright holders nor the names of contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY EGNITE SOFTWARE GMBH 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 EGNITE SOFTWARE GMBH 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.

For additional information see http://www.ethernut.de/

Id:: gpio_at91.c 3449 2011-05-31 19:08:15Z mifi

Parameters:

bank	GPIO bank/port number.
bit	Bit number of the specified bank/port.

Returns:: 1 if the pin level is high. 0 is returned if the pin level is low or if the pin is undefined.

Definition at line 53 of file gpio_at91.c.

References _BV, inr, NUTGPIO_PORT, NUTGPIO_PORTA, NUTGPIO_PORTB, and NUTGPIO_PORTC.

void GpioPinSetLow	(	int	bank,
		int	bit
	)

Set pin level to low.

Trying to set undefined pins is silently ignored.

Parameters:

bank	GPIO bank/port number.
bit	Bit number of the specified bank/port.

Definition at line 93 of file gpio_at91.c.

References _BV, NUTGPIO_PORT, NUTGPIO_PORTA, NUTGPIO_PORTB, NUTGPIO_PORTC, and outr.

void GpioPinSetHigh	(	int	bank,
		int	bit
	)

Set pin level to high.

Trying to set undefined pins is silently ignored.

Parameters:

bank	GPIO bank/port number.
bit	Bit number of the specified bank/port.

Definition at line 130 of file gpio_at91.c.

References _BV, NUTGPIO_PORT, NUTGPIO_PORTA, NUTGPIO_PORTB, NUTGPIO_PORTC, and outr.

void GpioPinSet	(	int	bank,
		int	bit,
		int	value
	)

Set pin level.

Trying to set undefined pins is silently ignored.

Parameters:

bank	GPIO bank/port number.
bit	Bit number of the specified bank/port.
value	Level, 0 for low or any other value for high.

Definition at line 168 of file gpio_at91.c.

References GpioPinSetHigh(), and GpioPinSetLow().

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unsigned int GpioPortGet ( int bank )

Get all pin levels of a specified bank/port.

Parameters:

bank	GPIO bank/port number.

Returns:: Pin levels. 0 is returned for unknown banks and pins.

Definition at line 185 of file gpio_at91.c.

References inr, NUTGPIO_PORT, NUTGPIO_PORTA, NUTGPIO_PORTB, and NUTGPIO_PORTC.

void GpioPortSetLow	(	int	bank,
		unsigned int	mask
	)

Set multiple pin levels of a bank/port to low.

Parameters:

bank	GPIO bank/port number.
mask	Pin levels are set to low, if the corresponding bit in this mask is 1.

Returns:: Levels.

Definition at line 226 of file gpio_at91.c.

References NUTGPIO_PORT, NUTGPIO_PORTA, NUTGPIO_PORTB, NUTGPIO_PORTC, and outr.

void GpioPortSetHigh	(	int	bank,
		unsigned int	mask
	)

Set multiple pin levels of a bank/port to high.

Trying to set undefined ports is silently ignored.

Parameters:

bank	GPIO bank/port number.
mask	Pin levels are set to high, if the corresponding bit in this mask is 1.

Definition at line 264 of file gpio_at91.c.

References NUTGPIO_PORT, NUTGPIO_PORTA, NUTGPIO_PORTB, NUTGPIO_PORTC, and outr.

void GpioPortSet	(	int	bank,
		unsigned int	value
	)

Set all pin levels of a bank/port.

This routine can be used to simultaneously set all pins of a specific port. However, in some implementations the high bit values will be set before the low bit values. If this is a problem, you should use GpioPortSetHigh() and GpioPortSetLow().

Parameters:

bank	GPIO bank/port number.
value	Pin levels are set to high, if the corresponding bit in this mask is 1. All other pin levels are set to low.

Definition at line 306 of file gpio_at91.c.

References GpioPortSetHigh(), and GpioPortSetLow().

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uint32_t GpioPinConfigGet	(	int	bank,
		int	bit
	)

Get pin configuration.

Parameters:

bank	GPIO bank/port number.
bit	Bit number of the specified bank/port.

Returns:: Attribute flags of the pin.

Definition at line 325 of file gpio_at91.c.

References _BV, GPIO_CFG_DEBOUNCE, GPIO_CFG_DISABLED, GPIO_CFG_MULTIDRIVE, GPIO_CFG_OUTPUT, GPIO_CFG_PULLUP, inr, NUTGPIO_PORT, NUTGPIO_PORTA, NUTGPIO_PORTB, and NUTGPIO_PORTC.

int GpioPortConfigSet	(	int	bank,
		unsigned int	mask,
		uint32_t	flags
	)

Set port wide pin configuration.

Note:: This function does not check for undefined ports and pins or invalid attributes. If this is required, use GpioPinConfigSet().

Parameters:

bank	GPIO bank/port number.
mask	The given attributes are set for a specific pin, if the corresponding bit in this mask is 1.
flags	Attribute flags to set.

Returns:: Always 0.

Definition at line 475 of file gpio_at91.c.

References _BV, GPIO_CFG_DEBOUNCE, GPIO_CFG_DISABLED, GPIO_CFG_MULTIDRIVE, GPIO_CFG_OUTPUT, GPIO_CFG_PULLUP, NUTGPIO_PORT, NUTGPIO_PORTA, NUTGPIO_PORTB, NUTGPIO_PORTC, outr, PIO_ID, PIOA_ID, PIOB_ID, PIOC_ID, and PMC_PCER.

int GpioPinConfigSet	(	int	bank,
		int	bit,
		uint32_t	flags
	)

Set pin configuration.

Applications may also use this function to make sure, that a specific attribute is available for a specific pin.

Note:: GPIO pins are typically initialized to a safe state after power up. This routine is not able to determine the consequences of changing pin configurations. In the worst case you may permanently damage your hardware by bad pin settings.

Parameters:

bank	GPIO bank/port number.
bit	Bit number of the specified bank/port.
flags	Attribute flags.

Returns:: 0 if all attributes had been set, -1 otherwise.

Definition at line 710 of file gpio_at91.c.

References _BV, GpioPinConfigGet(), and GpioPortConfigSet().

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int GpioRegisterIrqHandler	(	GPIO_SIGNAL *	sig,
		int	bit,
		void()(void )	handler,
		void *	arg
	)

Register a GPIO pin interrupt handler.

Generating interrupts on GPIO pin changes is not supported on all platforms. In this case dedicated external interrupt pins may be used with NutRegisterIrqHandler().

Interrupts are triggered on rising and falling edges. Level triggering or triggering on specific edges is not supported.

After registering, interrupts are disabled. Calling GpioIrqEnable() is required to activate the interrupt.

The following code fragment registers an interrupt handler which is called on each change of bit 4 of the first GPIO port:

 #include <dev/gpio.h>

 static void PinChange(void *arg)
 {
     ...
 }

 {
     ...
     GpioPinConfigSet(0, 4, GPIO_CFG_PULLUP);
     GpioRegisterIrqHandler(&sig_GPIO, 4, PinChange, NULL);
     GpioIrqEnable(&sig_GPIO, 4);
     ...
 }

Parameters:

sig	Bank/port interrupt to be associated with this handler.
bit	Bit number of the specified bank/port.
handler	This routine will be called by Nut/OS, when the specified pin changes its state.
arg	Argument to be passed to the interrupt handler routine.

Returns:: 0 on success, -1 otherwise.

Definition at line 761 of file gpio_at91.c.

References GPIO_SIGNAL::ios_handler, GPIO_SIGNAL::ios_sig, GPIO_SIGNAL::ios_vector, GPIO_VECTOR::iov_arg, GPIO_VECTOR::iov_handler, malloc(), memset(), NutIrqEnable(), and NutRegisterIrqHandler().

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int GpioIrqEnable	(	GPIO_SIGNAL *	sig,
		int	bit
	)

Enable a specified GPIO interrupt.

A related interrupt handler must have been registered before calling this function. See GpioRegisterIrqHandler().

Parameters:

sig	Interrupt to enable.
bit	Bit number of the specified bank/port.

Returns:: 0 on success, -1 otherwise.

Definition at line 797 of file gpio_at91.c.

References GPIO_SIGNAL::ios_ctl, and NUT_IRQCTL_ENABLE.

int GpioIrqDisable	(	GPIO_SIGNAL *	sig,
		int	bit
	)

Disable a specified GPIO interrupt.

Parameters:

sig	Interrupt to disable.
bit	Bit number of the specified bank/port.

Returns:: 0 on success, -1 otherwise.

Definition at line 810 of file gpio_at91.c.

References GPIO_SIGNAL::ios_ctl, and NUT_IRQCTL_DISABLE.

Functions

Function Documentation