SPI Flash Devices
[Special Hardware]

Collaboration diagram for SPI Flash Devices:

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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.

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

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Function Documentation

int SpiFlashEnable (  void   )

Enable SPI device flash programming. Returns: 0 if device could be located, -1 otherwise.

void SpiFlashId (  u_char *  id  )

Read SPI device ID. Parameters: id  Three byte character array, which receives the CPU ID.

int SpiFlashWriteByte (  u_char  high, u_short  addr, u_char  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.

int SpiFlashWriteWord (  u_short  addr, u_short  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.

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).

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