//------------------------------------------------------------------------------
/// 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;
}
//------------------------------------------------------------------------------
// Reads and returns the status register of the serial flash.
// \param pAt26 Pointer to an AT26 driver instance.
//------------------------------------------------------------------------------
unsigned char AT26F004_Unprotect(At26 *pAt26)
{
unsigned char error;
unsigned int sector, sectorAddress = 0;
for (sector = 0 ; sector < 11 ; sector ++)
{
sectorAddress = 0x0;
if (sector == 10)
sectorAddress = 0x7C000;
else if (sector == 9)
sectorAddress = 0x7A000;
else if (sector == 8)
sectorAddress = 0x78000;
else if (sector == 7)
sectorAddress = 0x70000;
else
sectorAddress = sectorAddress + (0x10000 * sector);
// Write Enable
AT26D_EnableWrite(pAt26);
error = AT26_SendCommand(pAt26, AT26_UNPROTECT_SECTOR, 4, 0, 0, sectorAddress, 0, 0);
ASSERT(!error, "-F- AT26_SectorUnprotect: Failed to issue command.\n\r");
// Wait for transfer to finish
AT26D_Wait(pAt26);
}
return 0;
}
//------------------------------------------------------------------------------
/// Unprotects the contents of the serial flash device.
/// Returns 0 if the device has been unprotected; otherwise returns
/// SF_PROTECTED.
/// \param pAt26 Pointer to an AT26 driver instance.
//------------------------------------------------------------------------------
unsigned char AT26D_Unprotect(At26 *pAt26)
{
unsigned char status;
SANITY_CHECK(pAt26);
// Get the status register value to check the current protection
status = AT26D_ReadStatus(pAt26);
if ((status & AT26_STATUS_SWP) == AT26_STATUS_SWP_PROTNONE) {
// Protection already disabled
return 0;
}
// Check if sector protection registers are locked
if ((status & AT26_STATUS_SPRL) == AT26_STATUS_SPRL_LOCKED) {
// Unprotect sector protection registers by writing the status reg.
AT26D_EnableWrite(pAt26);
AT26D_WriteStatus(pAt26, 0);
}
// Perform a global unprotect command
AT26D_EnableWrite(pAt26);
#if defined(BOARD_AT26F004)
AT26F004_Unprotect(pAt26);
#endif
AT26D_WriteStatus(pAt26, 0);
// Check the new status
status = AT26D_ReadStatus(pAt26);
if ((status & (AT26_STATUS_SPRL | AT26_STATUS_SWP)) != 0) {
return AT26_ERROR_PROTECTED;
}
else {
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;
}