spibus0at91.c File Reference

#include <cfg/spi.h>
#include <cfg/arch/gpio.h>
#include <dev/spibus_at91.h>
#include <dev/irqreg.h>
#include <sys/event.h>
#include <sys/nutdebug.h>
#include <stdlib.h>
#include <errno.h>

Include dependency graph for spibus0at91.c:

Functions
int	At91Spi0ChipSelect (uint_fast8_t cs, uint_fast8_t hi)
	Set the specified chip select to a given level.
int	At91SpiBus0Select (NUTSPINODE *node, uint32_t tmo)
	Select a device on the first SPI bus.
int	At91SpiBus0Deselect (NUTSPINODE *node)
	Deselect a device on the first SPI bus.
void	At91SpiBus0Interrupt (void *arg)
int	At91SpiBus0Transfer (NUTSPINODE *node, const void *txbuf, void *rxbuf, int xlen)
	Transfer data on the SPI bus using single buffered interrupt mode.
Variables
NUTSPIBUS	spiBus0At91
	AT91 SPI bus driver implementation structure.

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Function Documentation

int At91Spi0ChipSelect	(	uint_fast8_t	cs,
		uint_fast8_t	hi
	)

Set the specified chip select to a given level.

References EIO, errno, and rc.

Referenced by At91SpiBus0Deselect(), At91SpiBus0Select(), and At91SpiBusNodeInit().

int At91SpiBus0Select	(	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 _BV, At91Spi0ChipSelect(), _AT91SPIREG::at91spi_csr, _AT91SPIREG::at91spi_mr, At91SpiSetup(), _NUTSPIBUS::bus_mutex, EIO, errno, _NUTSPINODE::node_bus, _NUTSPINODE::node_cs, _NUTSPINODE::node_mode, _NUTSPINODE::node_stat, NULL, NUTASSERT, NutEventPost(), NutEventWait(), outr, PIO_PDR_OFF, PMC_PCER, rc, SPI0_ID, SPI0_PINS, SPI0_PIO_BASE, SPI0_PSR_OFF, SPI_MODE_CSHIGH, SPI_MODE_UPDATE, and SPI_SPIEN.

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int At91SpiBus0Deselect

(

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 At91Spi0ChipSelect(), At91SpiBusWait(), _NUTSPIBUS::bus_mutex, _NUTSPINODE::node_bus, _NUTSPINODE::node_cs, _NUTSPINODE::node_mode, NULL, NUT_WAIT_INFINITE, NUTASSERT, NutEventPost(), outr, PIO_ODR_OFF, PIO_PER_OFF, SPI0_PINS, SPI0_PIO_BASE, and SPI_MODE_CSHIGH.

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void At91SpiBus0Interrupt

(

void *

arg

)

References inb, NutEventPostFromIrq, and outb.

Referenced by At91SpiBusNodeInit().

int At91SpiBus0Transfer	(	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 At91SpiSelect().

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, _NUTSPINODE::node_bus, NULL, NUT_WAIT_INFINITE, NUTASSERT, NutEventWait(), outr, SPI_IDR_OFF, SPI_IER_OFF, SPI_RDRF, and SPI_TDR_OFF.

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Variable Documentation

NUTSPIBUS spiBus0At91

Initial value:

 {
    NULL,                       
    NULL,                       
    SPI0_BASE,                  
    &sig_SPI0,                  
    At91SpiBusNodeInit,         
    At91SpiBus0Select,          
    At91SpiBus0Deselect,        





    At91SpiBus0Transfer,




    NutSpiBusWait,              

    NutSpiBusSetMode,           
    NutSpiBusSetRate,           
    NutSpiBusSetBits            
}

AT91 SPI bus driver implementation structure.