Can't read jedec id from the MT25TL512HBA8E12-0AAT TR using stm32h7

[srikanthkomati]

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i am trying to read the jedec id from the  MT25TL512HBA8E12-0AAT TR using stm32h750xbh6 with qspi
i configured qspi using mx like follows:

hqspi.Instance = QUADSPI;
hqspi.Init.ClockPrescaler = 1;
hqspi.Init.FifoThreshold = 4;
hqspi.Init.SampleShifting = QSPI_SAMPLE_SHIFTING_NONE;
hqspi.Init.FlashSize = 25;
hqspi.Init.ChipSelectHighTime = QSPI_CS_HIGH_TIME_6_CYCLE;
hqspi.Init.ClockMode = QSPI_CLOCK_MODE_0;
hqspi.Init.DualFlash = QSPI_DUALFLASH_ENABLE;

i configured the clock using rcc enabled hse and lse and finally giving the clock for qspi around 50mhz

the function im using to read is the below one

static HAL_StatusTypeDef QSPI_ReadID_3B(QSPI_HandleTypeDef *hq, uint8_t id[3]) {
QSPI_CommandTypeDef c = {0};
c.InstructionMode = QSPI_INSTRUCTION_1_LINE;
c.Instruction = 0x9F; // READ JEDEC ID (1-0-1)
c.AddressMode = QSPI_ADDRESS_NONE;
c.AlternateByteMode = QSPI_ALTERNATE_BYTES_NONE;
c.DataMode = QSPI_DATA_1_LINE;
c.DummyCycles = 0;
c.NbData = 3;
c.DdrMode = QSPI_DDR_MODE_DISABLE;
c.DdrHoldHalfCycle = QSPI_DDR_HHC_ANALOG_DELAY;
c.SIOOMode = QSPI_SIOO_INST_EVERY_CMD;

HAL_StatusTypeDef st = HAL_QSPI_Command(hq, &c, HAL_QSPI_TIMEOUT_DEFAULT_VALUE);
if (st != HAL_OK) return st;
return HAL_QSPI_Receive(hq, id, HAL_QSPI_TIMEOUT_DEFAULT_VALUE);
}

its always returning only 0s 
what are the issues.

what we have to keep in mind when we are doing this reading.
is there any proper procedure to follow 

[KDJEM.1]

Hello @srikanthkomati ;

Could you please share the memory datasheet?

Could you verify the QSPI signals (CLK, CS, IO0,....) are correctly connected. Also, ensure the flash memory is powered.

Also, I recommend you referring to AN5050 precisely "Table 7. STM32CubeMX - Configuration of OCTOSPI signals and mode" and "Table 8. STM32CubeMX - Configuration of OCTOSPI parameters" to check the memory configuration.

Thank you.

Kaouthar

[srikanthkomati]

hi @KDJEM.1 

I am attaching the data sheet and I double checked the connections and they are as per the schematics of my board 
and flash memory is also powered up

if I am giving the command-address-data as 4-0-4 in the command structure its returning 255s for 3 bytes 

but not able to read the correct data.
thank you .

[Tesla DeLorean]

Show a wiring diagram and pin initialization. 

In Dual mode you'd typically read 6 bytes as the data will be interleaved between the two die, 3 from each. Each pair of bytes should be the same.

Reading zero suggests the interface is wrong.

Suggest getting a scope or analyzer on the pins.