spi_master.c File Reference

#include "spi_master.h"
#include "FreeRTOS.h"
#include "semphr.h"

Functions
void	spi_master_setup_device (volatile avr32_spi_t *spi, struct spi_device *device, spi_flags_t flags, uint32_t baud_rate, board_spi_select_id_t sel_id)
	Setup a SPI device. More...
status_code_t	spi_read_packet (volatile avr32_spi_t *spi, uint8_t *data, size_t len)
	Receive a sequence of bytes from a SPI device. More...
status_code_t	spi_write_packet (volatile avr32_spi_t *spi, const uint8_t *data, size_t len)
	Send a sequence of bytes to a SPI device. More...

void spi_master_setup_device	(	volatile avr32_spi_t *	spi,
		struct spi_device *	device,
		spi_flags_t	flags,
		uint32_t	baud_rate,
		board_spi_select_id_t	sel_id
	)

Setup a SPI device.

The returned device descriptor structure must be passed to the driver whenever that device should be used as current slave device.

Parameters

spi	Base address of the SPI instance.
device	Pointer to SPI device struct that should be initialized.
flags	SPI configuration flags. Common flags for all implementations are the SPI modes SPI_MODE_0 ... SPI_MODE_3.
baud_rate	Baud rate for communication with slave device in Hz.
sel_id	Board specific select id

References CONFIG_SPI_MASTER_BITS_PER_TRANSFER, CONFIG_SPI_MASTER_DELAY_BCT, CONFIG_SPI_MASTER_DELAY_BS, getBaudDiv(), spi_device::id, spi_enable_active_mode(), spi_set_baudrate_register(), spi_set_bits_per_transfer(), spi_set_chipselect_delay_bct(), spi_set_chipselect_delay_bs(), spi_set_mode(), sysclk_get_peripheral_bus_hz(), vSemaphoreCreateBinary, and xSPIMutex.

status_code_t spi_read_packet	(	volatile avr32_spi_t *	spi,
		uint8_t *	data,
		size_t	len
	)

Receive a sequence of bytes from a SPI device.

All bytes sent out on SPI bus are sent as value 0.

Parameters

spi	Base address of the SPI instance.
data	Data buffer to read
len	Length of data

Precondition

SPI device must be selected with spi_select_device() first

References CONFIG_SPI_MASTER_DUMMY, ERR_TIMEOUT, spi_is_rx_ready(), spi_is_tx_ready(), spi_read_single(), SPI_TIMEOUT, spi_write_single(), and STATUS_OK.

status_code_t spi_write_packet	(	volatile avr32_spi_t *	spi,
		const uint8_t *	data,
		size_t	len
	)

Send a sequence of bytes to a SPI device.

Received bytes on the SPI bus are discarded.

Parameters

spi	Base address of the SPI instance.
data	Data buffer to write
len	Length of data

Precondition

SPI device must be selected with spi_select_device() first

References ERR_TIMEOUT, spi_is_tx_ready(), SPI_TIMEOUT, spi_write_single(), and STATUS_OK.