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STM32WB with QSPI flash MT25QL256ABA (PMod SF3)

NRedd.2
Associate III

Hello all, 

I have a very strange issue with QSPI peripheral. I am using it to store logs in external memory. 

The flash that is used is MT25QL256ABA with a custom STM32WB55 board. I have connected PModSF3 using jumper wires that are at least 15cm long.

 

Issue: When I use the FAST READ (single data line, 1-1-1 mode), it works perfectly fine. I am able to validate it with the hex dump of a buffer that writes ASCII (0-9). But when I use it in QUAD OUTPUT FAST READ (1-1-4), I get some missing data that is probably shifted.

 

I have specified two dummy cycles based on the datasheet. Tried increasing it, does not make much of difference.

But reducing the clock speed by a factor of 100 seems to help, but then quad mode is useless. 

The code is based mostly from the ST examples. 

 

Can anyone help me in figuring out the issue? I can provide more data if needed.

NRedd2_1-1729016790809.png

 

NRedd2_0-1729016599271.png

 

static bool qspi_flash_read_fast_single_line(size_t address, uint8_t* pBuf, size_t length)
{
	QSPI_CommandTypeDef sCommand;

	dummy_cycles_cfg(&hqspi);

	sCommand.InstructionMode   = QSPI_INSTRUCTION_1_LINE;
	sCommand.AlternateByteMode = QSPI_ALTERNATE_BYTES_NONE;
	sCommand.DdrMode           = QSPI_DDR_MODE_DISABLE;
	sCommand.SIOOMode          = QSPI_SIOO_INST_EVERY_CMD;

	//! Send read command (Does not work)
	sCommand.Instruction = 0x6B;

	//! Address configuration
	sCommand.AddressMode = QSPI_ADDRESS_1_LINE;
	sCommand.AddressSize = QSPI_ADDRESS_24_BITS;
	sCommand.Address     = address;
	sCommand.DummyCycles = DUMMY_CLOCK_CYCLES_READ; //< Two dummy cycles

	//! Receive data configuration
	sCommand.DataMode = QSPI_DATA_4_LINES;
	sCommand.NbData   = length;


	if (HAL_QSPI_Command(&hqspi, &sCommand, HAL_QSPI_TIMEOUT_DEFAULT_VALUE) != HAL_OK)
	{
		CONSOLE_LOG("Failed to send read command");
		return false;
	}

	if (HAL_QSPI_Receive(&hqspi, pBuf, HAL_QSPI_TIMEOUT_DEFAULT_VALUE) != HAL_OK)
	{
		CONSOLE_LOG("Failed to receive data in quad mode");
		return false;
	}

	return true;
}

 

10 REPLIES 10

@Tesla DeLorean 

 

Thanks a lot for tagging these resources.

I will post an update as soon as some progress has been made.