spi.h File Reference

SPI interface with MSP 430. More...

Go to the source code of this file.

Functions
void	SPIInit (void)
	Initializes SPI unit. More...
void	SPISelectDevice (uint8 device)
	Selects a SPI device and sets its wordsize. More...
void	SPISelectDeviceISR (uint8 device)
	Selects a SPI device and enable high A,B,C. More...
void	SPIDeselect (void)
	Cancels all selections. More...
void	SPIDeselectSynchronous (void)
	Cancels all selections. Then immediately sends a byte of 0xFF. More...
boolean	SPIDeselectISR (void)
	Deselects all select/latch pins Waits till all transfers are finished. More...
void	SPISemaphoreGiveFromISR (void)
boolean	SPIXmitNullByte (uint8 dat)
	Transmits a byte to nothing via SPI. You must already have the mutex and config set up. Does not set the Slave Select line on anything, so you can clock to nothing. Allows for delays such as to the SD Card. More...
void	SPIXmitNullBytes (uint8 device, uint16 numBytes)
	Transmits a variable number of 0xFF bytes to nothing via SPI. Does not need the mutex to be gotten or the bus to be configured. Essentially talks a set number of null bytes to nothing. Required to send null bytes to set up an SD card like device. Sets the transmit line to high to ensure that the line stays high (required for SD cards). More...
void	SPIConfigure (uint32 ulBase, uint8 wordSize, uint8 mode, uint32 frequency)
	Sets the SPI word size and data format This function must be called after you have the mutex - after radio max clock freq = 10mhz MSP430 max fre clkI cycles - we might be violating this SD card -fast frequency ~= 2 MHz sound chip - 2s to be 400kHz at first, then bump up speed. More...
void	SPIConfigureDevice (uint8 device)
	Configures a SPI device to have the correct SPI mode, frequency, and word size. More...

Detailed Description

SPI interface with MSP 430.

Since

Mar 26, 2011

Author

James McLurkin

Function Documentation

void SPIConfigure	(	uint32	ulBase,
		uint8	wordSize,
		uint8	mode,
		uint32	frequency
	)

Sets the SPI word size and data format This function must be called after you have the mutex - after radio max clock freq = 10mhz MSP430 max fre clkI cycles - we might be violating this SD card -fast frequency ~= 2 MHz sound chip - 2s to be 400kHz at first, then bump up speed.

Parameters

ulBase	is the SSI port
wordSize	is the new word size to be set
mode	is the new transmission mode
frequency	is the frequency that the SPI clock will run at

Returns

void

void SPIConfigureDevice

(

uint8

device)

Configures a SPI device to have the correct SPI mode, frequency, and word size.

@ param device The device that needs to be configured.

Returns

void

void SPIDeselect

(

void

)

Cancels all selections.

Makes all SPI devices inactive.

Returns

void

boolean SPIDeselectISR

(

void

)

Deselects all select/latch pins Waits till all transfers are finished.

Returns

if their is a error return FALSE else ture

void SPIDeselectSynchronous

(

void

)

Cancels all selections. Then immediately sends a byte of 0xFF.

Makes all SPI devices inactive. Then immediately sends a byte of 0xFF.

Returns

void

void SPIInit

(

void

)

Initializes SPI unit.

Enables peripherals Configures GPIO Sets radio, accelerometer, and LED as output Sets word size as 0

Returns

void

void SPISelectDevice

(

uint8

device)

Selects a SPI device and sets its wordsize.

Does not select anything if the input parameter is not recognized.

Parameters

device

to be selected

Returns

void

void SPISelectDeviceISR

(

uint8

device)

Selects a SPI device and enable high A,B,C.

Parameters

device

to be selected

Returns

void

void SPISemaphoreGiveFromISR

(

void

)

Returns

void

boolean SPIXmitNullByte

(

uint8

dat)

Transmits a byte to nothing via SPI. You must already have the mutex and config set up. Does not set the Slave Select line on anything, so you can clock to nothing. Allows for delays such as to the SD Card.

Parameters

dat	The byte that will be sent to nothing.

Returns

boolean TRUE if it was sent correctly, FALSE otherwise.

void SPIXmitNullBytes	(	uint8	device,
		uint16	numBytes
	)

Transmits a variable number of 0xFF bytes to nothing via SPI. Does not need the mutex to be gotten or the bus to be configured. Essentially talks a set number of null bytes to nothing. Required to send null bytes to set up an SD card like device. Sets the transmit line to high to ensure that the line stays high (required for SD cards).

Parameters

device	The device that the fake bytes will be configured to send to.
numBytes	The number of bytes that will be sent..

Returns

boolean TRUE if it was sent correctly, FALSE otherwise.