at91_spi.c File Reference

#include <cfg/arch.h>
#include <dev/board.h>
#include <dev/irqreg.h>
#include <sys/event.h>
#include <sys/timer.h>
#include <dev/at91_spi.h>

Include dependency graph for at91_spi.c:

Functions
int	At91Spi0Init (void)
	Initialize the first serial peripheral interface on the AT91 MCU.
int	At91Spi0InitChipSelects (unsigned int mask)
	Initialize specified SPI0 chip selects on the AT91 MCU.
int	At91Spi0Enable (void)
	Initialize the second serial peripheral interface on the AT91 MCU.
int	At91SpiInit (unsigned int base)
	Initialize serial peripheral interface on the AT91 MCU.
int	At91SpiEnable (unsigned int base)
int	At91SpiDisable (unsigned int base)
int	At91SpiReset (unsigned int base)
	Reset serial peripheral interface on the AT91 MCU.
int	At91SpiInitChipSelects (unsigned int base, unsigned int mask)
	Initialize specified SPI chip selects on the AT91 MCU.
int	At91SpiSetRate (unsigned int base, unsigned int cs, uint32_t rate)
	Configure the SPI rate.
uint32_t	At91SpiGetModeFlags (unsigned int base, unsigned int cs)
int	At91SpiSetModeFlags (unsigned int base, unsigned int cs, uint32_t mode)
	Configure the SPI operation mode.
unsigned int	At91SpiGetBits (unsigned int base, unsigned int cs)
int	At91SpiSetBits (unsigned int base, unsigned int cs, unsigned int bits)
unsigned int	At91SpiGetSckDelay (unsigned int base, unsigned int cs)
int	At91SpiSetSckDelay (unsigned int base, unsigned int cs, unsigned int dly)
unsigned int	At91SpiGetTxDelay (unsigned int base, unsigned int cs)
int	At91SpiSetTxDelay (unsigned int base, unsigned int cs, unsigned int dly)
unsigned int	At91SpiGetCsDelay (unsigned int base)
int	At91SpiSetCsDelay (unsigned int base, unsigned int dly)
int	At91SpiTransfer2 (unsigned int base, unsigned int cs, const void *txbuf, void *rxbuf, int xlen, const void *txnbuf, void *rxnbuf, int xnlen)
	Transfer two SPI buffers.

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Function Documentation

int At91Spi0Init

(

void

)

Initialize the first serial peripheral interface on the AT91 MCU.

References _BV, At91Spi0Enable(), At91SpiReset(), NutIrqEnable(), NutRegisterIrqHandler(), outr, PMC_PCER, sig_SPI0, SPI0_BASE, and SPI0_ID.

Referenced by At91SpiInit().

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int At91Spi0InitChipSelects

(

unsigned int

mask

)

Initialize specified SPI0 chip selects on the AT91 MCU.

Parameters:

mask	Chip selects to use. Set bit 0 for NPCS0, bit 1 for NPCS1 and so on.

Returns:

0 on success or -1 if any of the specified chip selects is not available.

References _BV, outr, PIO_PDR_OFF, SPI0_CS0_PIN, SPI0_CS0_PIO_BASE, SPI0_CS0_PSR_OFF, SPI0_CS1_PIN, SPI0_CS1_PIO_BASE, SPI0_CS1_PSR_OFF, SPI0_CS2_PIN, SPI0_CS2_PIO_BASE, SPI0_CS2_PSR_OFF, SPI0_CS3_PIN, SPI0_CS3_PIO_BASE, and SPI0_CS3_PSR_OFF.

int At91Spi0Enable

(

void

)

Initialize the second serial peripheral interface on the AT91 MCU.

References outr, PIO_PDR_OFF, SPI0_PINS, SPI0_PIO_BASE, and SPI0_PSR_OFF.

int At91SpiInit

(

unsigned int

base

)

Initialize serial peripheral interface on the AT91 MCU.

Parameters:

base	Interface base address, either SPI_BASE, SPI0_BASE or SPI1_BASE.

Returns:

0 on success or -1 if SPI is not available.

References At91Spi0Init(), rc, SPI0_BASE, and SPI1_BASE.

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int At91SpiEnable

(

unsigned int

base

)

References outr, SPI_CR_OFF, and SPI_SPIEN.

Referenced by At91SpiReset().

int At91SpiDisable

(

unsigned int

base

)

References outr, SPI_CR_OFF, and SPI_SPIDIS.

Referenced by At91SpiReset().

int At91SpiReset

(

unsigned int

base

)

Reset serial peripheral interface on the AT91 MCU.

Parameters:

base	Interface base address, either SPI_BASE, SPI0_BASE or SPI1_BASE.

Returns:

0 on success or -1 if SPI is not available.

References At91SpiDisable(), At91SpiEnable(), outr, rc, SPI_CR_OFF, SPI_DLYBCS_LSB, SPI_MODFDIS, SPI_MR_OFF, SPI_MSTR, SPI_PCS, and SPI_SWRST.

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int At91SpiInitChipSelects	(	unsigned int	base,
		unsigned int	mask
	)

Initialize specified SPI chip selects on the AT91 MCU.

Parameters:

base	Interface base address, either SPI_BASE, SPI0_BASE or SPI1_BASE.
mask	Chip selects to use. Set bit 0 for NPCS0, bit 1 for NPCS1 and so on.

Returns:

0 on success or -1 if any of the specified chip selects is not available.

References At91Spi0InitChipSelects(), rc, SPI0_BASE, and SPI1_BASE.

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int At91SpiSetRate	(	unsigned int	base,
		unsigned int	cs,
		uint32_t	rate
	)

Configure the SPI rate.

Parameters:

base	SPI register base.
cs	Chip select line.
rate	Baudrate. The maximum is MCK/1 and the minimum is MCK/255. If the specified rate is above the maximum or below the minimum, the maximum or minimum value resp. will be set.

References inr, NUT_HWCLK_PERIPHERAL, NutClockGet, outr, rc, SPI_CSR0_OFF, SPI_CSR1_OFF, SPI_CSR2_OFF, SPI_CSR3_OFF, SPI_SCBR, and SPI_SCBR_LSB.

uint32_t At91SpiGetModeFlags	(	unsigned int	base,
		unsigned int	cs
	)

References inr, rc, SPI_CPOL, SPI_CSR0_OFF, SPI_LLB, SPI_MODFDIS, SPI_MR_OFF, SPI_MSTR, SPI_NCPHA, SPI_PCSDEC, SPIMF_CAPRISE, SPIMF_LOOPBACK, SPIMF_MASTER, SPIMF_MFDETECT, and SPIMF_SCKIAHI.

int At91SpiSetModeFlags	(	unsigned int	base,
		unsigned int	cs,
		uint32_t	mode
	)

Configure the SPI operation mode.

Parameters:

base	SPI register base.
cs	Chip select line.
mode	Any of the following SPIMF_MASTER Master mode. SPIMF_PCSDEC Decoded chip selects. SPIMF_MFDETECT Mode fault detection. SPIMF_LOOPBACK Loopback mode. SPIMF_SCKIAHI Clock is high when inactive. SPIMF_CAPRISE Data cpatured on rising edge. SPIMF_KEEPCS Chip select remains active after transfer.

References At91SpiGetModeFlags(), inr, outr, SPI_CPOL, SPI_CSAAT, SPI_CSR0_OFF, SPI_LLB, SPI_MODFDIS, SPI_MR_OFF, SPI_MSTR, SPI_NCPHA, SPI_PCSDEC, SPIMF_CAPRISE, SPIMF_KEEPCS, SPIMF_LOOPBACK, SPIMF_MASTER, SPIMF_MFDETECT, SPIMF_PCSDEC, and SPIMF_SCKIAHI.

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unsigned int At91SpiGetBits	(	unsigned int	base,
		unsigned int	cs
	)

References inr, rc, SPI_BITS, SPI_BITS_10, SPI_BITS_11, SPI_BITS_12, SPI_BITS_13, SPI_BITS_14, SPI_BITS_15, SPI_BITS_16, SPI_BITS_9, and SPI_CSR0_OFF.

int At91SpiSetBits	(	unsigned int	base,
		unsigned int	cs,
		unsigned int	bits
	)

References At91SpiGetBits(), inr, outr, SPI_BITS, SPI_BITS_10, SPI_BITS_11, SPI_BITS_12, SPI_BITS_13, SPI_BITS_14, SPI_BITS_15, SPI_BITS_16, SPI_BITS_8, SPI_BITS_9, and SPI_CSR0_OFF.

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unsigned int At91SpiGetSckDelay	(	unsigned int	base,
		unsigned int	cs
	)

References inr, SPI_CSR0_OFF, and SPI_DLYBS_LSB.

int At91SpiSetSckDelay	(	unsigned int	base,
		unsigned int	cs,
		unsigned int	dly
	)

References At91SpiGetSckDelay(), inr, outr, SPI_CSR0_OFF, SPI_DLYBS, and SPI_DLYBS_LSB.

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unsigned int At91SpiGetTxDelay	(	unsigned int	base,
		unsigned int	cs
	)

References inr, SPI_CSR0_OFF, and SPI_DLYBCT_LSB.

int At91SpiSetTxDelay	(	unsigned int	base,
		unsigned int	cs,
		unsigned int	dly
	)

References At91SpiGetTxDelay(), inr, outr, SPI_CSR0_OFF, SPI_DLYBCT, and SPI_DLYBCT_LSB.

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unsigned int At91SpiGetCsDelay

(

unsigned int

base

)

References inr, SPI_DLYBCS_LSB, and SPI_MR_OFF.

int At91SpiSetCsDelay	(	unsigned int	base,
		unsigned int	dly
	)

References At91SpiGetCsDelay(), inr, outr, SPI_DLYBCS, SPI_DLYBCS_LSB, and SPI_MR_OFF.

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int At91SpiTransfer2	(	unsigned int	base,
		unsigned int	cs,
		const void *	txbuf,
		void *	rxbuf,
		int	xlen,
		const void *	txnbuf,
		void *	rxnbuf,
		int	xnlen
	)

Transfer two SPI buffers.

Parameters:

base	SPI port base address.
cs	SPI device chip select.
txbuf	First transmit buffer.
rxbuf	First receive buffer.
xlen	Length of first transfer.
txnbuf	Second transmit buffer.
rxnbuf	Second receive buffer.
xnlen	Length of second transfer.

References inr, NutEventWait(), outr, PDC_RXTDIS, PDC_RXTEN, PDC_TXTDIS, PDC_TXTEN, PERIPH_PTCR_OFF, PERIPH_RCR_OFF, PERIPH_RNCR_OFF, PERIPH_RNPR_OFF, PERIPH_RPR_OFF, PERIPH_TCR_OFF, PERIPH_TNCR_OFF, PERIPH_TNPR_OFF, PERIPH_TPR_OFF, rc, SPI0_BASE, SPI1_BASE, SPI_IDR_OFF, SPI_IER_OFF, SPI_MR_OFF, SPI_PCS, SPI_PCS_0, SPI_PCS_1, SPI_PCS_2, SPI_PCS_3, SPI_RXBUFF, and SPI_SR_OFF.

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