spibus_at91.c File Reference

#include <cfg/spi.h>
#include <sys/timer.h>
#include <sys/nutdebug.h>
#include <stdlib.h>
#include <memdebug.h>
#include <dev/spibus_at91.h>

Include dependency graph for spibus_at91.c:

Defines
#define	SPI_DOUBLE_BUFFER_MIN_TRANSFER_SIZE   4
Functions
int	At91SpiSetup (NUTSPINODE *node)
	Update SPI shadow registers.
int	At91SpiBusNodeInit (NUTSPINODE *node)
	Initialize an SPI bus node.

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Define Documentation

#define SPI_DOUBLE_BUFFER_MIN_TRANSFER_SIZE   4

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Function Documentation

int At91SpiSetup

(

NUTSPINODE *

node

)

Update SPI shadow registers.

Parameters:

node	Specifies the SPI bus node.

Returns:

Always 0.

References _AT91SPIREG::at91spi_csr, _AT91SPIREG::at91spi_mr, _NUTSPIBUS::bus_base, _NUTSPINODE::node_bits, _NUTSPINODE::node_bus, _NUTSPINODE::node_mode, _NUTSPINODE::node_rate, _NUTSPINODE::node_stat, NULL, NUT_HWCLK_PERIPHERAL, NUTASSERT, NutClockGet, SPI_BITS, SPI_BITS_LSB, SPI_CPOL, SPI_CSAAT, SPI_LLB, SPI_MODE_CPHA, SPI_MODE_CPOL, SPI_MODE_CSKEEP, SPI_MODE_FAULT, SPI_MODE_LOOPBACK, SPI_MODE_UPDATE, SPI_MODFDIS, SPI_NCPHA, SPI_SCBR, and SPI_SCBR_LSB.

Referenced by At91SpiBus0Select(), and At91SpiBusNodeInit().

int At91SpiBusNodeInit

(

NUTSPINODE *

node

)

Initialize an SPI bus node.

This routine is called for each SPI node, which is registered via NutRegisterSpiDevice().

Parameters:

node	Specifies the SPI bus node.

Returns:

0 on success or -1 if there is no valid chip select.

References At91Spi0ChipSelect(), At91Spi1ChipSelect(), _AT91SPIREG::at91spi_csr, _AT91SPIREG::at91spi_mr, At91SpiBus0Interrupt(), At91SpiBus1Interrupt(), At91SpiSetup(), _NUTSPIBUS::bus_base, _NUTSPIBUS::bus_ready, _NUTSPIBUS::bus_sig, malloc(), _NUTSPINODE::node_bus, _NUTSPINODE::node_cs, _NUTSPINODE::node_mode, _NUTSPINODE::node_stat, NULL, NUTASSERT, NutIrqEnable(), NutRegisterIrqHandler(), outr, rc, SPI1_BASE, SPI_IDR_OFF, SPI_MODE_CSHIGH, SPI_MODFDIS, SPI_MSTR, SPI_PCS_0, SPI_PCS_1, SPI_PCS_2, and SPI_PCS_3.

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