STM32H747 Memory Mapped NOR-Flash AT25SF128A

[EmbeddedOrca]

Hi,

I'm trying to implement an external loader for the Arduino Giga R1 board with AT25S128A 128Mbit of external flash. After following the guide given in the external loader repo, I'm running into the problem, that I can erase, write & read from the memory fine, however, as soon as I try to turn on memory mapped mode, all the data reads as 0xFF...FF, both in code and in the STM32CubeIDE memory viewer. I think my problems could be related to MCU configuration, I would be grateful if someone could give some guidance, see the relevant code below and attached. 

quadspi.c:

uint8_t CSP_QSPI_EnableMemoryMappedMode(void) {
	QSPI_CommandTypeDef sCommand = { 0 };
	QSPI_MemoryMappedTypeDef sMemMappedCfg = { 0 };

	// Enable Memory-Mapped mode
	sCommand.InstructionMode = QSPI_INSTRUCTION_1_LINE;
	sCommand.Instruction = QUAD_INOUT_FAST_READ_CMD;
	sCommand.SIOOMode = QSPI_SIOO_INST_EVERY_CMD;
	sCommand.AddressMode = QSPI_ADDRESS_4_LINES;
	sCommand.AddressSize = QSPI_ADDRESS_24_BITS;
	sCommand.DataMode = QSPI_DATA_4_LINES;
	sCommand.AlternateByteMode = QSPI_ALTERNATE_BYTES_4_LINES;
	sCommand.AlternateBytesSize = QSPI_ALTERNATE_BYTES_8_BITS;
	sCommand.AlternateBytes = 0x00;
	sCommand.DummyCycles = 4;
	sCommand.DdrMode = QSPI_DDR_MODE_DISABLE;
	sCommand.DdrHoldHalfCycle = QSPI_DDR_HHC_ANALOG_DELAY;

//	sCommand.InstructionMode = QSPI_INSTRUCTION_1_LINE;
//	sCommand.Instruction = QUAD_OUT_FAST_READ_CMD;
//	sCommand.SIOOMode = QSPI_SIOO_INST_EVERY_CMD;
//	sCommand.AddressMode = QSPI_ADDRESS_1_LINE;
//	sCommand.AddressSize = QSPI_ADDRESS_24_BITS;
//	sCommand.Address = 0;
//	sCommand.DataMode = QSPI_DATA_4_LINES;
//	sCommand.NbData = 0;
//	sCommand.AlternateByteMode = QSPI_ALTERNATE_BYTES_1_LINE;
//	sCommand.AlternateBytesSize = QSPI_ALTERNATE_BYTES_8_BITS;
//	sCommand.AlternateBytes = 0x00;
//	sCommand.DummyCycles = 0;
//	sCommand.DdrMode = QSPI_DDR_MODE_DISABLE;
//	sCommand.DdrHoldHalfCycle = QSPI_DDR_HHC_ANALOG_DELAY;

	sMemMappedCfg.TimeOutActivation = QSPI_TIMEOUT_COUNTER_DISABLE;
	sMemMappedCfg.TimeOutPeriod = 0;

	if (HAL_QSPI_MemoryMapped(&hqspi, &sCommand, &sMemMappedCfg) != HAL_OK) {
		return HAL_ERROR;
	}

	return HAL_OK;
}

main.c test snippet:

  CSP_QUADSPI_Init();

  for (var = 0; var < MEMORY_SECTOR_SIZE; var++) {
      buffer_test[var] = (var & 0xFF);
  }
  for (var = 0; var < SECTORS_COUNT; var++) {
      if (CSP_QSPI_EraseSector(var * MEMORY_SECTOR_SIZE, (var + 1) * MEMORY_SECTOR_SIZE - 1) != HAL_OK) {
          while (1) {}
      }
      if (CSP_QSPI_WriteMemory(buffer_test, var * MEMORY_SECTOR_SIZE, sizeof(buffer_test)) != HAL_OK) {
          while (1) {}
      }
      if (CSP_QSPI_ReadMemory(buffer_read, var * MEMORY_SECTOR_SIZE, sizeof(buffer_test)) != HAL_OK) {
          while (1) {}
      }
  }

  if (CSP_QSPI_EnableMemoryMappedMode() != HAL_OK) {
      while (1) {}
  }
  uint8_t verify_buffer[MEMORY_SECTOR_SIZE] = {0};
  for (var = 0; var < SECTORS_COUNT; var++) {
      if (memcpy(verify_buffer, (uint8_t*) (0x90000000 + var * MEMORY_SECTOR_SIZE), MEMORY_SECTOR_SIZE) != HAL_OK) {
          while (1) {}
      }
  }

 Thank you for your help.

[KDJEM.1]

Hello @EmbeddedOrca and welcome to the community;

Could you please check if the write operation is done successfully?

Note only read operations are allowed to the external flash memory in memory-mapped mode. The indirect mode supports read and write operations.

Thank you.

Kaouthar

[DmitryR]

Hello @EmbeddedOrca ,

consider configuring absolutely all kinds of transmission to 4-line mode.

With best regards,

Dmitry

[EmbeddedOrca]

Hi Kaouthar,

Thank you for your answer. I'm only doing read operations after activating memory mapped mode as far as I'm aware. Also, I've checked that the read operation works by setting a breakpoint after the first memory write-read sequence in the main function. 

BR,

Jonah

[EmbeddedOrca]

Hi Dmitry,

I'm not quite sure what change exactly you are suggesting. As far as I can see I'm doing all operations in the fastest / most parallel operation the flash chip supports.

Best regards,

Jonah

[DmitryR]

Hello @EmbeddedOrca ,

for example you have configuration QSPI_INSTRUCTION_1_LINE and QSPI_ADDRESS_4_LINES. Try to change configuration so that absolutely all modes are configured the same - all for 4 lines or all for 1 line.

Then, when inserting breakpoint changes behavior often means that you have a race condition.

With best regards,

Dmitry

[EmbeddedOrca]

Hi Dmitry,

Thank you for the follow-up. I tried moving everything to 1 line communication as the flash does not support 4 line instructions. However, I still see no change in behavior sadly.

Best regards,

Jonah

[DmitryR]

Hi @EmbeddedOrca ,

have you also configured the QSPI peripheral in CubeMX as single/dial lines rather than four lines?

With best regards,

Dmitry

[EmbeddedOrca · Accepted solution]

Hi Dmitry, 

I have finally solved the... I accidentally performed block erases instead of sector erases which led to my "tests" not working. Thank you very much for the input. 

Jonah