SPI Flash Devices

Programs SPI attached flash devices. More...

Collaboration diagram for SPI Flash Devices:

Functions
int	SpiFlashEnable (void)
	Enable SPI device flash programming.
void	SpiFlashId (uint8_t *id)
int	SpiFlashWriteByte (uint8_t high, uint16_t addr, uint8_t data)
	Write byte to the target's flash memory.
int	SpiFlashWriteWord (uint16_t addr, uint16_t data)
	Write word to the target's flash memory.
void	SpiFlashErase (void)
	Erase target's flash memory.

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Detailed Description

Programs SPI attached flash devices.

When AVR CPUs are attached to the SPI, then the routines in this module can be used to write to the flash ROM of these devices.

These routines are poorly supported and may not work as expected.

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Function Documentation

int SpiFlashEnable

(

void

)

Enable SPI device flash programming.

Returns:

0 if device could be located, -1 otherwise.

Definition at line 93 of file spiflash.c.

References BV, cbi, outb, and sbi.

void SpiFlashId

(

uint8_t *

id

)

Read SPI device ID.

Parameters:

id	Three byte character array, which receives the CPU ID.

Definition at line 168 of file spiflash.c.

int SpiFlashWriteByte	(	uint8_t	high,
		uint16_t	addr,
		uint8_t	data
	)

Write byte to the target's flash memory.

The target must have been erased by a previous call to SpiFlashErase().

Parameters:

high	Must be 0 to write the low byte or 8 to write the high byte.
addr	Word address to write to.
data	Byte value to write.

Returns:

0 on success, -1 otherwise.

Definition at line 193 of file spiflash.c.

References NutDelay().

Referenced by SpiFlashWriteWord().

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int SpiFlashWriteWord	(	uint16_t	addr,
		uint16_t	data
	)

Write word to the target's flash memory.

Parameters:

addr	Word address to write to.
data	Word value to write.

Returns:

0 on success, -1 otherwise.

Definition at line 238 of file spiflash.c.

References SpiFlashWriteByte().

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void SpiFlashErase

(

void

)

Erase target's flash memory.

Sets all bytes on the target's flash memory to 0xFF. In addtion all lock bits are set to 1 (unprogrammed).

Definition at line 254 of file spiflash.c.

References NutDelay().

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