//------------------------------------------------------------------------------
/// Erases all the content of the memory chip.
/// \param pAt26 Pointer to an AT26 driver instance.
//------------------------------------------------------------------------------
unsigned char AT26D_EraseChip(At26 *pAt26)
{
unsigned char status;
unsigned char error;
SANITY_CHECK(pAt26);
// Check that the flash is unprotected
status = AT26D_ReadStatus(pAt26);
if ((status & AT26_STATUS_SWP) != AT26_STATUS_SWP_PROTNONE) {
return AT26_ERROR_PROTECTED;
}
// Enable critical write operation
AT26D_EnableWrite(pAt26);
// Erase the chip
error = AT26_SendCommand(pAt26, AT26_CHIP_ERASE_2, 1, 0, 0, 0, 0, 0);
ASSERT(!error, "-F- AT26_ChipErase: Could not issue command.\n\r");
// Wait for transfer to finish
AT26D_Wait(pAt26);
// Poll the Serial flash status register until the operation is achieved
AT26D_WaitReady(pAt26);
return 0;
}
//------------------------------------------------------------------------------
/// Erases the specified 64KB block of the serial firmware dataflash.
/// Returns 0 if successful; otherwise returns AT26_ERROR_PROTECTED if the
/// device is protected or AT26_ERROR_BUSY if it is busy executing a command.
/// \param pAt26 Pointer to an AT26 driver instance.
/// \param address Address of the block to erase.
//------------------------------------------------------------------------------
unsigned char AT26D_EraseBlock(At26 *pAt26, unsigned int address)
{
unsigned char status;
unsigned char error;
SANITY_CHECK(pAt26);
// Check that the flash is ready and unprotected
status = AT26D_ReadStatus(pAt26);
if ((status & AT26_STATUS_RDYBSY) != AT26_STATUS_RDYBSY_READY) {
TRACE_ERROR("AT26D_EraseBlock : Flash busy\n\r");
return AT26_ERROR_BUSY;
}
else if ((status & AT26_STATUS_SWP) != AT26_STATUS_SWP_PROTNONE) {
TRACE_ERROR("AT26D_EraseBlock : Flash protected\n\r");
return AT26_ERROR_PROTECTED;
}
// Enable critical write operation
AT26D_EnableWrite(pAt26);
// Start the block erase command
error = AT26_SendCommand(pAt26, AT26_BlockEraseCmd(pAt26), 4, 0, 0, address, 0, 0);
ASSERT(!error, "-F- AT26_EraseBlock: Could not issue command.\n\r");
// Wait for transfer to finish
AT26D_Wait(pAt26);
// Poll the Serial flash status register until the operation is achieved
AT26D_WaitReady(pAt26);
return 0;
}
//------------------------------------------------------------------------------
/// Writes data at the specified address on the serial firmware dataflash. The
/// page(s) to program must have been erased prior to writing. This function
/// handles page boundary crossing automatically.
/// Returns 0 if successful; otherwise, returns AT26_ERROR_PROGRAM is there has
/// been an error during the data programming.
/// \param pAt26 Pointer to an AT26 driver instance.
/// \param pData Data buffer.
/// \param size Number of bytes in buffer.
/// \param address Write address.
//------------------------------------------------------------------------------
unsigned char AT26D_Write(
At26 *pAt26,
unsigned char *pData,
unsigned int size,
unsigned int address)
{
unsigned int pageSize;
unsigned int writeSize;
unsigned char error;
unsigned char status;
SANITY_CHECK(pAt26);
SANITY_CHECK(pData);
// Retrieve device page size
pageSize = AT26_PageSize(pAt26);
// Program one page after the other
while (size > 0) {
// Compute number of bytes to program in page
writeSize = min(size, pageSize - (address % pageSize));
// Enable critical write operation
AT26D_EnableWrite(pAt26);
// Program page
error = AT26_SendCommand(pAt26, AT26_BYTE_PAGE_PROGRAM, 4,
pData, writeSize, address, 0, 0);
ASSERT(!error, "-F- AT26_WritePage: Failed to issue command.\n\r");
// Wait for transfer to finish
AT26D_Wait(pAt26);
// Poll the Serial flash status register until the operation is achieved
AT26D_WaitReady(pAt26);
// Make sure that write was without error
status = AT26D_ReadStatus(pAt26);
if ((status & AT26_STATUS_EPE) == AT26_STATUS_EPE_ERROR) {
return AT26_ERROR_PROGRAM;
}
pData += writeSize;
size -= writeSize;
address += writeSize;
}
return 0;
}
//------------------------------------------------------------------------------
/// Writes data at the specified address on the serial firmware dataflash. The
/// page(s) to program must have been erased prior to writing. This function
/// handles page boundary crossing automatically.
/// Returns 0 if successful; otherwise, returns AT26_ERROR_PROGRAM is there has
/// been an error during the data programming.
/// \param pAt26 Pointer to an AT26 driver instance.
/// \param pData Data buffer.
/// \param size Number of bytes in buffer.
/// \param address Write address.
//------------------------------------------------------------------------------
unsigned char AT26D_Write(
At26 *pAt26,
unsigned char *pData,
unsigned int size,
unsigned int address)
{
unsigned int pageSize;
unsigned int writeSize;
unsigned char error;
#if !defined(BOARD_AT26F004)
unsigned char status;
#endif
unsigned int i = 0;
SANITY_CHECK(pAt26);
SANITY_CHECK(pData);
// Retrieve device page size
pageSize = AT26_PageSize(pAt26);
// Program one page after the other
while (size > 0) {
// Compute number of bytes to program in page
#if defined(BOARD_AT26F004)
writeSize = 1;
#else
writeSize = min(size, pageSize - (address % pageSize));
#endif
// Enable critical write operation
AT26D_EnableWrite(pAt26);
if (AT26_ManId(pAt26) == SST_SPI_FLASH) {
error = AT26_SendCommand(pAt26, AT26_SEQUENTIAL_PROGRAM_1, 4,
pData, 2, address, 0, 0);
ASSERT(!error, "-F- AT26_WritePage: Failed to issue command.\n\r");
/* Wait for transfer to finish */
AT26D_Wait(pAt26);
/* Poll the Serial flash status register until the operation is achieved */
AT26D_WaitReady(pAt26);
for (i = 2; i < pageSize; i += 2) {
error = AT26_SendCommand(pAt26, AT26_SEQUENTIAL_PROGRAM_1, 1,
pData + i, 2, 0, 0, 0);
ASSERT(!error, "-F- AT26_WritePage: Failed to issue command.\n\r");
/* Wait for transfer to finish */
AT26D_Wait(pAt26);
/* Poll the Serial flash status register until the operation is achieved */
AT26D_WaitReady(pAt26);
}
}
else
{
// Program page
error = AT26_SendCommand(pAt26, AT26_BYTE_PAGE_PROGRAM, 4,
pData, writeSize, address, 0, 0);
ASSERT(!error, "-F- AT26_WritePage: Failed to issue command.\n\r");
// Wait for transfer to finish
AT26D_Wait(pAt26);
// Poll the Serial flash status register until the operation is achieved
AT26D_WaitReady(pAt26);
}
#if !defined(AT26F004)
// Make sure that write was without error
status = AT26D_ReadStatus(pAt26);
if ((status & AT26_STATUS_EPE) == AT26_STATUS_EPE_ERROR) {
return AT26_ERROR_PROGRAM;
}
#endif
pData += writeSize;
size -= writeSize;
address += writeSize;
}
return 0;
}
