Primary AVR32 SPI bus controller. More...

#include <cfg/spi.h>
#include <arch/avr32.h>
#include <arch/avr32/gpio.h>
#include <dev/spibus_avr32.h>
#include <dev/irqreg.h>
#include <dev/gpio.h>
#include <sys/event.h>
#include <sys/nutdebug.h>
#include <stdlib.h>
#include <errno.h>
#include <avr32/io.h>

Include dependency graph for spibus1.c:

Functions
int	Avr32Spi1ChipSelect (uint_fast8_t cs, uint_fast8_t hi)
	Set the specified chip select to a given level.
int	Avr32SpiBus1Select (NUTSPINODE *node, uint32_t tmo)
	Select a device on the first SPI bus.
int	Avr32SpiBus1Deselect (NUTSPINODE *node)
	Deselect a device on the first SPI bus.
void	Avr32SpiBus1Interrupt (void *arg)
int	Avr32SpiBus1Transfer (NUTSPINODE node, const void txbuf, void *rxbuf, int xlen)
	Transfer data on the SPI bus using single buffered interrupt mode.
Variables
NUTSPIBUS	spiBus1Avr32
	Avr32 SPI bus driver implementation structure.

Detailed Description

Primary AVR32 SPI bus controller.

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 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 OWNER 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/

May be configured as an interrupt driven or polling driver. The interrupt driven version may use single or double buffering.

* $Id: spibus1.c,v 1.3 2009/01/30 08:56:39 haraldkipp Exp $
*

Function Documentation

int Avr32Spi1ChipSelect	(	uint_fast8_t	cs,
		uint_fast8_t	hi
	)

Set the specified chip select to a given level.

References EIO, errno, and rc.

Referenced by Avr32SpiBus1Deselect(), Avr32SpiBus1Select(), and Avr32SpiBusNodeInit().

int Avr32SpiBus1Select	(	NUTSPINODE *	node,
		uint32_t	tmo
	)

Select a device on the first SPI bus.

Locks and activates the bus for the specified node.

Parameters:

node	Specifies the SPI bus node.
tmo	Timeout in milliseconds. To disable timeout, set this parameter to NUT_WAIT_INFINITE.

Returns:: 0 on success. In case of an error, -1 is returned and the bus is not locked.

References Avr32Spi1ChipSelect(), Avr32SpiSetup(), _NUTSPIBUS::bus_mutex, _AVR32SPIREG::csr, EIO, errno, gpio_enable_module_pin(), _AVR32SPIREG::mr, _NUTSPINODE::node_bus, _NUTSPINODE::node_cs, _NUTSPINODE::node_mode, _NUTSPINODE::node_stat, NULL, NUTASSERT, NutEventPost(), NutEventWait(), outr, rc, SPI_MODE_CSHIGH, and SPI_MODE_UPDATE.

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int Avr32SpiBus1Deselect ( NUTSPINODE * node )

Deselect a device on the first SPI bus.

Deactivates the chip select and unlocks the bus.

Parameters:

node	Specifies the SPI bus node.

Returns:: Always 0.

References Avr32Spi1ChipSelect(), Avr32SpiBusWait(), _NUTSPIBUS::bus_mutex, _NUTSPINODE::node_bus, _NUTSPINODE::node_cs, _NUTSPINODE::node_mode, NULL, NUT_WAIT_INFINITE, NUTASSERT, NutEventPost(), and SPI_MODE_CSHIGH.

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void Avr32SpiBus1Interrupt ( void * arg )

References inr, NutEventPostFromIrq, and outr.

Referenced by Avr32SpiBusNodeInit().

int Avr32SpiBus1Transfer	(	NUTSPINODE *	node,
		const void *	txbuf,
		void *	rxbuf,
		int	xlen
	)

Transfer data on the SPI bus using single buffered interrupt mode.

A device must have been selected by calling Avr32SpiSelect().

Parameters:

node	Specifies the SPI bus node.
txbuf	Pointer to the transmit buffer. If NULL, undetermined byte values are transmitted.
rxbuf	Pointer to the receive buffer. If NULL, then incoming data is discarded.
xlen	Number of bytes to transfer.

Returns:: Always 0.

References _NUTSPIBUS::bus_base, _NUTSPIBUS::bus_ready, inr, _NUTSPINODE::node_bits, _NUTSPINODE::node_bus, NULL, NUT_WAIT_INFINITE, NUTASSERT, NutEventWait(), and outr.

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Variable Documentation

NUTSPIBUS spiBus1Avr32

Initial value:

 {
    NULL,                       
    NULL,                       
    AVR32_SPI1_ADDRESS,         
    &sig_SPI1,                  
    Avr32SpiBusNodeInit,        
    Avr32SpiBus1Select,         
    Avr32SpiBus1Deselect,       





    Avr32SpiBus1Transfer,




    NutSpiBusWait,              

    NutSpiBusSetMode,           
    NutSpiBusSetRate,           
    NutSpiBusSetBits            
}

Avr32 SPI bus driver implementation structure.

Functions

Variables

Detailed Description

Function Documentation

Variable Documentation