This file contains SPI lib. More...

#include "config.h"
#include "spi_lib.h"

Include dependency graph for spi_lib.c:

Functions
bit	spi_init_master (U8 mode, U8 rate, Bool b_msb_first)
	This function configures the SPI controller in master.
bit	spi_init_slave (U8 mode, U8 rate, Bool b_msb_first)
	This function configures the SPI controller in slave.
char	spi_putchar (char ch)
	This function sends a byte on the SPI.
bit	spi_test_hit (void)
	This function checks if a bytes has been received on the SPI.
char	spi_getchar (void)
	This function reads a byte on the SPI.
void	spi_transmit_master (char cData)
	SPI Make the transmission possible.
char	spi_rw (char tx)
	This function sends a byte on SPI interface.

Detailed Description

This file contains SPI lib.

Compiler: IAR EWAVR and GNU GCC for AVR
Supported devices: ATmega32U4

Author:: Atmel Corporation: http://www.atmel.com
Support and FAQ: http://support.atmel.no/

Definition in file spi_lib.c.

Function Documentation

bit spi_init_master	(	U8	mode,
		U8	rate,
		Bool	b_msb_first
	)

This function configures the SPI controller in master.

Parameters:

mode	SPI_MODE_0 to SPI_MODE_3
rate	SPI_RATE_0 to SPI_RATE_6
b_msb_first	TRUE if the MSB of the data word is transmitted first

Returns:: FALSE in case of error; TRUE, initialization OK

Definition at line 62 of file spi_lib.c.

References Spi_enable, Spi_init_bus, Spi_select_master, Spi_set_lsbfirst, Spi_set_mode, Spi_set_msbfirst, Spi_set_rate, and TRUE.

{
   Spi_select_master();
   Spi_set_mode(mode);
   Spi_set_rate(rate);
   if( b_msb_first )
   {
      Spi_set_msbfirst();
   }else{
      Spi_set_lsbfirst();
   }
   Spi_init_bus();   
   Spi_enable();
   return TRUE;
}

bit spi_init_slave	(	U8	mode,
		U8	rate,
		Bool	b_msb_first
	)

This function configures the SPI controller in slave.

Parameters:

mode	SPI_MODE_0 to SPI_MODE_3
rate	SPI_RATE_0 to SPI_RATE_6
b_msb_first	TRUE if the MSB of the data word is transmitted first

Returns:: FALSE in case of error; TRUE, initialization OK

Definition at line 88 of file spi_lib.c.

References Spi_enable, Spi_init_bus, Spi_select_slave, Spi_set_lsbfirst, Spi_set_mode, Spi_set_msbfirst, Spi_set_rate, and TRUE.

{
   Spi_select_slave();
   Spi_set_mode(mode);
   Spi_set_rate(rate);
   if( b_msb_first )
   {
      Spi_set_msbfirst();
   }else{
      Spi_set_lsbfirst();
   }
   Spi_init_bus();   
   Spi_enable();
   return TRUE;
}

char spi_putchar ( char ch )

This function sends a byte on the SPI.

Parameters:

uc_wr_byte character to send on the SPI

Returns:: character sent

Definition at line 111 of file spi_lib.c.

References Spi_tx_ready, and Spi_write_data.

{
   Spi_write_data(ch);
   while(!Spi_tx_ready());
   return ch;
}

bit spi_test_hit ( void )

This function checks if a bytes has been received on the SPI.

Returns:: TRUE if byte received

Definition at line 123 of file spi_lib.c.

References Spi_rx_ready.

{
   return Spi_rx_ready();
}

char spi_getchar ( void )

This function reads a byte on the SPI.

Returns:: character read

Definition at line 133 of file spi_lib.c.

References Spi_read_data, and Spi_rx_ready.

{
   register char c;
   while(!Spi_rx_ready());
   c = Spi_read_data();
   return c;
}

void spi_transmit_master ( char cData )

SPI Make the transmission possible.

Parameters:

cData the data byte to send

Definition at line 146 of file spi_lib.c.

References Spi_wait_eot, and Spi_write_data.

{
   // Wait for transmission complete 
   Spi_wait_eot();
   // Start new transmission 
   Spi_write_data(cData);
}

char spi_rw ( char tx )

This function sends a byte on SPI interface.

Parameters:

tx	the data byte to send

Returns:: the received byte

Definition at line 161 of file spi_lib.c.

References Spi_read_data, and Spi_write_data.

{
   Spi_write_data(tx);
   return Spi_read_data();
}

spi_lib.c File Reference

Functions

Detailed Description

Function Documentation