spi2.c File Reference

#include <avr/io.h>
#include "spi2.h"

Functions
void	init_spi (uint8_t rate)
	Initialise the rate for the SPI bus.
void	xmit_spi (uint8_t dat)
	Transmit an 8 bit value to the SPI bus.
uint8_t	recv_spi (void)
	Receive an 8 bit value from the SPI bus.

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Function Documentation

void init_spi

(

uint8_t

rate

)

[inline]

Initialise the rate for the SPI bus.

Parameters:

rate

Value whose bottom 2 bits are used to set the SPI bus rate.

Requires I/O to have been set correctly independently See Atmel datasheet for the correct value to use in this function to get the SPI rate required. rate is masked so only the bottom 2 bits are valid. rate 0 0 fosc/4 0 1 fosc/16 1 0 fosc/64 1 1 fosc/128

uint8_t recv_spi

(

void

)

[inline]

Receive an 8 bit value from the SPI bus.

Returns:

Value from SPI bus.

Requires spi_init() to have been run, and I/O set correctly

void xmit_spi

(

uint8_t

data

)

[inline]

Transmit an 8 bit value to the SPI bus.

Parameters:

data

Value to send via SPI bus.

Requires spi_init() to have been run, and I/O set correctly