Micron QSPI Nonvolatile Config register Write not working.

[Sachin Sanghani]

Hi Everyone, I am using STM32H757I-EVAL board and the onboard Twin Quad SPI Nor Flash ( MT25QL512ABB8ESF-0SIT ). I have configured QSPI to operate in DUAL Flash mode.

I am able to perform memory read, memory write, memory erase, and internal configuration register read operation from/to QSPI flash.

But, When I try to update NonVolatile configuration register, It fails to update it.

If I change my QSPI memory configuration from Dual Flash mode to Singal flash mode, It works for Flash-1.

So, Is there anything that I am missing for the Dual Flash Mode?

I am enabling Write Latch before write Operation.

As per the technical notes for STM32H757i_EVAL board, both flash needs to have an ideal configuration.

Here is the code snippet

int32_t WriteNonVolatileConfigurationRegister( QSPI_HandleTypeDef *Ctx, Interface_t Mode, uint8_t *pData )
{
  QSPI_CommandTypeDef s_command;
 
  /* Initialize the command */
  s_command.InstructionMode   = QSPI_INSTRUCTION_4_LINES;
  s_command.Instruction       = WRITE_NONVOL_CFG_REG_CMD;		// 0xB1
  s_command.AddressMode       = QSPI_ADDRESS_NONE;
  s_command.DataMode          = QSPI_DATA_4_LINES;
  s_command.AlternateByteMode = QSPI_ALTERNATE_BYTES_NONE;
  s_command.DummyCycles       = 0;
  s_command.NbData            = 4;	// QSPI_DUALFLASH_ENABLE = 0x04, QSPI_DUALFLASH_DISABLE = 0x02
 
  s_command.DdrMode           = QSPI_DDR_MODE_DISABLE;
  s_command.DdrHoldHalfCycle  = QSPI_DDR_HHC_ANALOG_DELAY;
  s_command.SIOOMode          = QSPI_SIOO_INST_EVERY_CMD;
 
  /*write enable */
  if( WriteEnable(Ctx, QPI_MODE)!= OK)
  {
    return ERROR_COMMAND;
  }
 
  /* Send the command */
  if (HAL_QSPI_Command(Ctx, &s_command, HAL_QPSI_TIMEOUT_DEFAULT_VALUE) != HAL_OK)
  {
    return ERROR_COMMAND;
  }
 
  if (HAL_QSPI_Transmit( Ctx, pData, HAL_QPSI_TIMEOUT_DEFAULT_VALUE) != HAL_OK)
  {
    return ERROR_TRANSMIT;
  }
 
  /* Configure automatic polling mode to wait the memory is ready */
  if( AutoPollingMemReady(Ctx, QPI_MODE)!= OK)
  {
    return ERROR_COMMAND;
  }
 
  return OK;
}

[Tesla DeLorean]

And how's this called? What data? Does it wait on both devices? Does the Write Enable get to both?

[Sachin Sanghani]

Hi @Community member​ , Thanks for looking into this issue.

Does the Write Enable get to both?

-> Yes, The WriteEnable will set Write enable latch on both devices.

Does it wait on both devices?

->Yes, The AutoPollingMemReady will poll Write in progress bit from Flag Status register on both devices.

What data?

-> NonVolatile Configuration register is a 2Byte register, and I want 0 and 3rd bit to be zero ( default all bits are set to 1). So my data buffer is { 0xF6, 0xFF, 0xF6, 0xFF }

"The WRITE NONVOLATILE CONFIGURATION REGISTER operation must have input data starting from the least significant byte."

And how's this called?

-> This will be called by main.

WriteNonVolatileConfigurationRegister( &hqspi, QPI_MODE, nonVolatileConfigurationRegBuf );

uint8_t nonVolatileConfigurationRegBuf[4] = { 0xF6, 0xFF, 0xF6, 0xFF };

[Sachin Sanghani · Accepted solution]

What Data? solved my issue!!!!

Expected Data is: { 0xF6, 0xF6, 0xFF, 0xFF }

Can write NonVolatile Config register !!

Thanks for your Question 🙂

[Tesla DeLorean]

Yes, data should be interleaved