SPI#

Basic Serial Peripheral Interface Driver.

Simple, blocking SPI controller implementation for communication with external devices.

Functions#

void

spi_init(void)

Initialize a USART peripheral for SPI.

void

spi_deinit(void)

De-initialize a USART peripheral for SPI.

void

spi_writeByte(uint8_t data)

Write a single byte discarding the received byte.

void

spi_writeHalfword(uint16_t data)

Write two bytes discarding the received bytes.

void

spi_write3Byte(uint32_t data)

Write three bytes discarding the received bytes.

uint8_t

spi_readByte(void)

Read a byte by sending a 0xFF byte.

uint16_t

spi_readHalfword(void)

Read two bytes by sending two 0xFF bytes.

void

spi_setCsActive(void)

Assert the peripheral select line.

void

spi_setCsInactive(void)

Dessert the peripheral select line.

uint32_t

spi_getUsartPPUSATD(uint32_t *ppusatdNr)

Get PPUSATD word of the (E)USART in use.

Function Documentation#

spi_init#

void spi_init (void )

Initialize a USART peripheral for SPI.

Parameters

Type	Direction	Argument Name	Description
void	N/A

spi_deinit#

void spi_deinit (void )

De-initialize a USART peripheral for SPI.

Parameters

Type	Direction	Argument Name	Description
void	N/A

spi_writeByte#

void spi_writeByte (uint8_t data)

Write a single byte discarding the received byte.

Parameters

Type	Direction	Argument Name	Description
uint8_t	[in]	data	The byte to send

spi_writeHalfword#

void spi_writeHalfword (uint16_t data)

Write two bytes discarding the received bytes.

Parameters

Type	Direction	Argument Name	Description
uint16_t	[in]	data	The bytes to send, most significant byte first

spi_write3Byte#

void spi_write3Byte (uint32_t data)

Write three bytes discarding the received bytes.

Parameters

Type	Direction	Argument Name	Description
uint32_t	[in]	data	The bytes to send, most significant byte first

spi_readByte#

uint8_t spi_readByte (void )

Read a byte by sending a 0xFF byte.

Parameters

Type	Direction	Argument Name	Description
void	N/A

Returns

The received byte

spi_readHalfword#

uint16_t spi_readHalfword (void )

Read two bytes by sending two 0xFF bytes.

Parameters

Type	Direction	Argument Name	Description
void	N/A

Returns

The received bytes, most significant byte first

spi_setCsActive#

void spi_setCsActive (void )

Assert the peripheral select line.

Parameters

Type	Direction	Argument Name	Description
void	N/A

Polarity is configured by spi_init.

spi_setCsInactive#

void spi_setCsInactive (void )

Dessert the peripheral select line.

Parameters

Type	Direction	Argument Name	Description
void	N/A

Polarity is configured by spi_init.

spi_getUsartPPUSATD#

uint32_t spi_getUsartPPUSATD (uint32_t * ppusatdNr)

Get PPUSATD word of the (E)USART in use.

Parameters

Type	Direction	Argument Name	Description
uint32_t *	[out]	ppusatdNr	PPUSATD register number

Returns

The PPUSATD word of the (E)USART in use