spi_bit.h File Reference

SPI bit-bashing interface. More...

#include <gpxe/spi.h>
#include <gpxe/bitbash.h>

Go to the source code of this file.

Data Structures
struct	spi_bit_basher
	A bit-bashing SPI bus. More...
Defines
#define	SPI_BIT_SS(slave)   ( SPI_BIT_SS0 + (slave) )
	Determine bit index for a particular slave.
#define	SPI_BIT_UDELAY   1
	Delay between SCLK transitions.
#define	SPI_BIT_BIG_ENDIAN   0
	SPI bit basher treats data as big-endian.
#define	SPI_BIT_LITTLE_ENDIAN   1
	SPI bit basher treats data as little-endian.
Enumerations
enum	{ SPI_BIT_SCLK = 0, SPI_BIT_MOSI, SPI_BIT_MISO, SPI_BIT_SS0 }
	Bit indices used for SPI bit-bashing interface. More...
Functions
	FILE_LICENCE (GPL2_OR_LATER)
void	init_spi_bit_basher (struct spi_bit_basher *spibit)
	Initialise SPI bit-bashing interface.

---

Detailed Description

SPI bit-bashing interface.

Definition in file spi_bit.h.

---

Define Documentation

#define SPI_BIT_SS

(

slave

)

( SPI_BIT_SS0 + (slave) )

Determine bit index for a particular slave.

Parameters:

slave

Slave number

Return values:

index

Bit index (i.e. SPI_BIT_SSN, where N=slave)

Definition at line 50 of file spi_bit.h.

Referenced by spi_bit_set_slave_select().

#define SPI_BIT_UDELAY   1

Delay between SCLK transitions.

Definition at line 53 of file spi_bit.h.

Referenced by spi_bit_delay().

#define SPI_BIT_BIG_ENDIAN   0

SPI bit basher treats data as big-endian.

Definition at line 56 of file spi_bit.h.

Referenced by spi_bit_rw(), and spi_bit_transfer().

#define SPI_BIT_LITTLE_ENDIAN   1

SPI bit basher treats data as little-endian.

Definition at line 59 of file spi_bit.h.

Referenced by natsemi_init_eeprom().

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Enumeration Type Documentation

anonymous enum

Bit indices used for SPI bit-bashing interface.

Enumerator:

SPI_BIT_SCLK	Serial clock.
SPI_BIT_MOSI	Master Out Slave In.
SPI_BIT_MISO	Master In Slave Out.
SPI_BIT_SS0	Slave 0 select.

Definition at line 33 of file spi_bit.h.

     {
        /** Serial clock */
        SPI_BIT_SCLK = 0,
        /** Master Out Slave In */
        SPI_BIT_MOSI,
        /** Master In Slave Out */
        SPI_BIT_MISO,
        /** Slave 0 select */
        SPI_BIT_SS0,
};

---

Function Documentation

FILE_LICENCE

(

GPL2_OR_LATER

)

void init_spi_bit_basher

(

struct spi_bit_basher *

spibit

)

Initialise SPI bit-bashing interface.

Parameters:

spibit

SPI bit-bashing interface

Definition at line 221 of file spi_bit.c.

References assert, spi_bit_basher::basher, spi_bit_basher::bus, NULL, bit_basher::op, bit_basher_operations::read, spi_bus::rw, spi_bit_rw(), and bit_basher_operations::write.

Referenced by ifec_init_eeprom(), natsemi_init_eeprom(), rtl818x_probe(), and rtl_init_eeprom().

                                                           {
        assert ( &spibit->basher.op->read != NULL );
        assert ( &spibit->basher.op->write != NULL );
        spibit->bus.rw = spi_bit_rw;
}