SPI Driver

SPI Library for AVRs built-in SPI Hardware. More...

Files
file	spi.h
	SPI API Header.
file	spi.c
	SPI API Implementation.

Enumerations
enum	SPI_MODE { MODE_0 = 0, MODE_1 = 1, MODE_2 = 2, MODE_3 = 3 }
	SPI Mode option. More...
enum	SPI_SPEED {   SPEED_2 = 4, SPEED_4 = 0, SPEED_8 = 5, SPEED_16 = 1,   SPEED_32 = 6, SPEED_64 = 2, SPEED_128 = 3 }
	SPI Speed options. More...

Functions
void	spiInit (SPI_MODE mode, SPI_SPEED speed)
	Initialize the SPI Hardware Module. More...
uint8_t	spiSendByte (uint8_t d)
	Send and Receive one byte. More...

Detailed Description

SPI Library for AVRs built-in SPI Hardware.

Enumeration Type Documentation

enum SPI_MODE

SPI Mode option.

Enumerator
MODE_0	CPOL 0, CPHA 0.
MODE_1	CPOL 0, CPHA 1.
MODE_2	CPOL 1, CPHA 0.
MODE_3	CPOL 1, CPHA 1.

Definition at line 44 of file spi.h.

             {
    MODE_0 = 0, 
    MODE_1 = 1, 
    MODE_2 = 2, 
    MODE_3 = 3, 
} SPI_MODE;

enum SPI_SPEED

SPI Speed options.

Enumerator
SPEED_2	F_CPU / 2.
SPEED_4	F_CPU / 4.
SPEED_8	F_CPU / 8.
SPEED_16	F_CPU / 16.
SPEED_32	F_CPU / 32.
SPEED_64	F_CPU / 64.
SPEED_128	F_CPU / 128.

Definition at line 52 of file spi.h.

             {
    SPEED_2 = 4, 
    SPEED_4 = 0, 
    SPEED_8 = 5, 
    SPEED_16 = 1, 
    SPEED_32 = 6, 
    SPEED_64 = 2, 
    SPEED_128 = 3, 
} SPI_SPEED;

Function Documentation

void spiInit	(	SPI_MODE	mode,
		SPI_SPEED	speed
	)

Initialize the SPI Hardware Module.

Parameters

mode	SPI Mode to use
speed	SPI Speed to use

Referenced by xyInit().

uint8_t spiSendByte

(

uint8_t

d

)

Send and Receive one byte.

Set the Chip Select Lines yourself!

Parameters

d	Data to be sent

Returns

Byte read from Bus

Definition at line 54 of file spi.c.

                               {
    SPDR = d;
    while (!(SPSR & (1 << SPIF))); // Wait for transmission
    return SPDR;
}