W25Q cannot read ID

[lagzilajcsi]

Hello!

I have a W25Q128JVIQ connected to an STM32F446RE like the following:

I am trying to use QuadSPI in Dual Mode, but I am having difficulties reading ANY data, like the Device ID (ABh). This is my code: 

 

W25Q_STATE W25Q_ReadID(u8_t *buf)
{
 QSPI_CommandTypeDef com;

 com.InstructionMode = QSPI_INSTRUCTION_1_LINE; // QSPI_INSTRUCTION_...
 com.Instruction = W25Q_FULLID_DUAL_IO; // Command

 com.AddressMode = QSPI_ADDRESS_1_LINE;
 com.AddressSize = QSPI_ADDRESS_24_BITS;
 com.Address = 0x0U;

 com.AlternateByteMode = QSPI_ALTERNATE_BYTES_NONE;
 com.AlternateBytes = QSPI_ALTERNATE_BYTES_NONE;
 com.AlternateBytesSize = QSPI_ALTERNATE_BYTES_NONE;

 com.DummyCycles = 0;
 com.DataMode = QSPI_DATA_1_LINE;
 com.NbData = 1;

 com.DdrMode = QSPI_DDR_MODE_DISABLE;
 com.DdrHoldHalfCycle = QSPI_DDR_HHC_ANALOG_DELAY;
 com.SIOOMode = QSPI_SIOO_INST_EVERY_CMD;

 if (HAL_QSPI_Command(&hqspi, &com, HAL_QSPI_TIMEOUT_DEFAULT_VALUE) != HAL_OK)
 {
 return W25Q_SPI_ERR;
 }
 if (HAL_QSPI_Receive(&hqspi, buf, HAL_QSPI_TIMEOUT_DEFAULT_VALUE) != HAL_OK)
 {
 return W25Q_SPI_ERR;
 }
 return W25Q_OK;
}

 

I also tried to read instruction 92h with datamode and address mode set to DATA_2_LINES, but it returns the same.

I am pretty sure, this is not the ID, it should return 23 or 238 according to the datasheet. I tried everything I could think of. Here is my QUADSPI init:

 

hqspi.Instance = QUADSPI;
 hqspi.Init.ClockPrescaler = 0;
 hqspi.Init.FifoThreshold = 4;
 hqspi.Init.SampleShifting = QSPI_SAMPLE_SHIFTING_HALFCYCLE;
 hqspi.Init.FlashSize = 23;
 hqspi.Init.ChipSelectHighTime = QSPI_CS_HIGH_TIME_2_CYCLE;
 hqspi.Init.ClockMode = QSPI_CLOCK_MODE_0;
 hqspi.Init.FlashID = QSPI_FLASH_ID_1;
 hqspi.Init.DualFlash = QSPI_DUALFLASH_DISABLE;

 

 

I would really appreciate some help! thanks

[lagzilajcsi]

I also tried setting dummy cycle to 3, but the results stay the same

[Pavel A.]

com.Instruction = W25Q_FULLID_DUAL_IO; // Command

com.DataMode = QSPI_DATA_1_LINE;

Really?

[Tesla DeLorean]

Perhaps stop random shot-gun coding.. 

0x9F would be 1-bit command (x8), and 1-bit data (x24), no address or dummy bits. Returning 0xEF,0x40,0x17  (239, 64, 23)

If that doesn't work evaluate what exactly you've wired and configured. 

Try with hqspi.Init.ClockPrescaler = 10; so as not to be maximally clocking

0xAB would need 3 dummy bytes (24 clocks), or 3-byte address of non-consequential content.

Inspect signals with a scope or logic analyzer

Show pin configuration code

[lagzilajcsi]

I managed to make it work!

My code:

W25Q_STATE W25Q_Init(void)
{
 W25Q_STATE state; // temp status variable

 // read id
 u8_t id;
 state = W25Q_ReadID(&id);
 if (state != W25Q_OK)
 return state;

 u8_t id_full[3];

 // state = W25Q_ReadID(id_full);
 state = W25Q_ReadFullID(id_full);
}

W25Q_STATE W25Q_ReadID(u8_t *buf)
{
 QSPI_CommandTypeDef com;

 com.InstructionMode = QSPI_INSTRUCTION_1_LINE; // QSPI_INSTRUCTION_...
 com.Instruction = W25Q_DEVID; // Command 0xAB

 com.AddressMode = QSPI_ADDRESS_NONE;
 com.AddressSize = QSPI_ADDRESS_NONE;
 com.Address = 0x0U;

 com.AlternateByteMode = QSPI_ALTERNATE_BYTES_NONE;
 com.AlternateBytes = QSPI_ALTERNATE_BYTES_NONE;
 com.AlternateBytesSize = QSPI_ALTERNATE_BYTES_NONE;

 com.DummyCycles = 0;
 com.DataMode = QSPI_DATA_1_LINE;
 com.NbData = 1;

 com.DdrMode = QSPI_DDR_MODE_DISABLE;
 com.DdrHoldHalfCycle = QSPI_DDR_HHC_ANALOG_DELAY;
 com.SIOOMode = QSPI_SIOO_INST_EVERY_CMD;

 if (HAL_QSPI_Command(&hqspi, &com, HAL_QSPI_TIMEOUT_DEFAULT_VALUE) != HAL_OK)
 {
 return W25Q_SPI_ERR;
 }
 if (HAL_QSPI_Receive(&hqspi, buf, HAL_QSPI_TIMEOUT_DEFAULT_VALUE) != HAL_OK)
 {
 return W25Q_SPI_ERR;
 }
 return W25Q_OK;
}

W25Q_STATE W25Q_ReadFullID(u8_t *buf)
{
 QSPI_CommandTypeDef com;

 com.InstructionMode = QSPI_INSTRUCTION_1_LINE; // QSPI_INSTRUCTION_...
 com.Instruction = W25Q_FULLID_DUAL_IO; // Command 0x92

 com.AddressMode = QSPI_ADDRESS_2_LINES;
 com.AddressSize = QSPI_ADDRESS_24_BITS;
 com.Address = 0x0U;

 com.AlternateByteMode = QSPI_ALTERNATE_BYTES_NONE;
 com.AlternateBytes = QSPI_ALTERNATE_BYTES_NONE;
 com.AlternateBytesSize = QSPI_ALTERNATE_BYTES_NONE;

 com.DummyCycles = 0;
 com.DataMode = QSPI_DATA_2_LINES;
 com.NbData = 3;

 com.DdrMode = QSPI_DDR_MODE_DISABLE;
 com.DdrHoldHalfCycle = QSPI_DDR_HHC_ANALOG_DELAY;
 com.SIOOMode = QSPI_SIOO_INST_EVERY_CMD;

 if (HAL_QSPI_Command(&hqspi, &com, HAL_QSPI_TIMEOUT_DEFAULT_VALUE) != HAL_OK)
 {
 return W25Q_SPI_ERR;
 }
 if (HAL_QSPI_Receive(&hqspi, buf, HAL_QSPI_TIMEOUT_DEFAULT_VALUE) != HAL_OK)
 {
 return W25Q_SPI_ERR;
 }
 return W25Q_OK;
}

If i call the readID twice, the second time it returns 255, because the chip is already awake. First time it returns 0. Afterwards, I call the readFullID, and it returns this:

Why is the first index 0? according to the datasheet, it should not be there. Could you help me understand this?