NRF52840 Problems Reading from QSPI Flash W25q32jv.

RE: NRF52840 Problems Reading from QSPI Flash W25q32jv.

Jimmy Wong — Mon, 30 Mar 2020 00:17:18 GMT

HI,

You can try to use the nrfjprog qspi option to erase the flash for trying. If failure, it is better to use the logic analyzer to check the signal on this failure board.

RE: NRF52840 Problems Reading from QSPI Flash W25q32jv.

Duy — Sun, 29 Mar 2020 18:42:39 GMT

Hello Jimmy Wong,

I am using your example on 2 boards:

- The 1st board fails, both m_buffer_tx and m_buffer_rx have value 0x88 for all of their elements. The m_buffer_tx values are changed after function err_code = nrf_drv_qspi_read(m_buffer_rx, QSPI_TEST_DATA_SIZE+QSPI_TEST_DATA_SIZE, QSPI_BASE_ADDRESS); is called.

- The 2nd boards work fines.

Do you have any idea how? Is is because of the flash IC is broken?

Thanks and best regards,

Duy

RE: NRF52840 Problems Reading from QSPI Flash W25q32jv.

dhananjay_sutariya — Mon, 27 Jan 2020 13:17:03 GMT

Hi Jimmy,

Sorry for the late reply.

I have done the word alignment, im using segger studio to compile so gcc compilation occurs I assume.

RE: NRF52840 Problems Reading from QSPI Flash W25q32jv.

Jimmy Wong — Mon, 20 Jan 2020 08:52:18 GMT

Hi,

you can use the compile to do the word alignment.

for example,

static uint8_t __ALIGN(4) m_buffer_tx[QSPI_TEST_DATA_SIZE];
static uint8_t __ALIGN(4) m_buffer_rx[QSPI_TEST_DATA_SIZE];

are you using the GCC or KEIL compiler?

RE: NRF52840 Problems Reading from QSPI Flash W25q32jv.

dhananjay_sutariya — Thu, 16 Jan 2020 06:58:48 GMT

Hi,

Thanks for your response,

I've already had the changes suggested by you in my sdkconfig file.

I have taken my data array of uint8_t of size 0X08 which is 4 byte aligned.

which gets loaded in this loop:

     for (i = 0; i < QSPI_TEST_DATA_SIZE; ++i)
        {
                m_buffer_tx[i] = (uint8_t)rand()%10;
                //NRF_LOG_INFO("[Main]Write data %u",m_buffer_tx[i]);

        }

Before drv_write api is called i check my buffer using this part of code in flash_qspi_write

         for (uint8_t i = 0; i < QSPI_TEST_DATA_SIZE; ++i)
        {
                //m_buffer_tx[i] = (uint32_t)rand()%20;
                NRF_LOG_INFO("[flash_qspi_write]Write data %u at index[0X%x]",p_tx_buffer[i],i);

        }

And after the data is read i print it inside the flash_qspi_read

         for (uint8_t i = 0; i < QSPI_TEST_DATA_SIZE   ; ++i)
        {
                //m_buffer_tx[i] = (uint32_t)rand()%20;
                NRF_LOG_INFO("[flash_qspi_read]Read data %u at index [0X%x]",p_rx_buffer[i],i);

        }

My output shows the shift here:

<info> app: Process of erasing first block start
<info> app: [flash_qspi_write]Write data 17039360 at index[0X0]
<info> app: [flash_qspi_write]Write data 151191808 at index[0X1]
<info> app: [flash_qspi_write]Write data 1081344 at index[0X2]
<info> app: [flash_qspi_write]Write data 5849 at index[0X3]
<info> app: [flash_qspi_write]Write data 1 at index[0X4]
<info> app: [flash_qspi_write]Write data 5849 at index[0X5]
<info> app: [flash_qspi_write]Write data 8 at index[0X6]
<info> app: [flash_qspi_write]Write data 1081344 at index[0X7]
<info> app: eflash_QSPI_WRITE_REQ
<info> app: eflash_QSPI_WRITE_DONE
<info> app: Process of writing data start at 0X108000
<info> app: writing data Succ

<info> app: eflash_QSPI_READ_REQ
<info> app: flash_qspi_read: address = 108000, len = 8
<info> app: eflash_QSPI_READ_DONE
<info> app: [flash_qspi_read]Read data 3149642683 at index [0X0]
<info> app: [flash_qspi_read]Read data 3149642683 at index [0X1]
<info> app: [flash_qspi_read]Read data 17039360 at index [0X2]
<info> app: [flash_qspi_read]Read data 151191808 at index [0X3]
<info> app: [flash_qspi_read]Read data 1081344 at index [0X4]
<info> app: [flash_qspi_read]Read data 5849 at index [0X5]
<info> app: [flash_qspi_read]Read data 1 at index [0X6]
<info> app: [flash_qspi_read]Read data 5849 at index [0X7]
<info> app: Data read at line :256 .

I guess this is alignment error of some sorts. How do we cope with that.

RE: NRF52840 Problems Reading from QSPI Flash W25q32jv.

Jimmy Wong — Tue, 14 Jan 2020 00:28:25 GMT

Hi,

Please provide the details about the failure case.

if you use my example of the QSPI on the non-Nordic DK board, you need to configure the pin assignment inside the sdk_config.h.

https://github.com/jimmywong2003/nrf52840-QSPI-flash-example/blob/master/qspi_module_example/pca10056/blank/config/sdk_config.h

Also, you need to check with the qspi flash on the mode such as read mode / write mode.

// <0=> FastRead
// <1=> Read2O
// <2=> Read2IO
// <3=> Read4O
// <4=> Read4IO

#ifndef NRFX_QSPI_CONFIG_READOC
#define NRFX_QSPI_CONFIG_READOC 4
#endif

// <o> NRFX_QSPI_CONFIG_WRITEOC  - Number of data lines and opcode used for writing.

// <0=> PP
// <1=> PP2O
// <2=> PP4O
// <3=> PP4IO

#ifndef NRFX_QSPI_CONFIG_WRITEOC
#define NRFX_QSPI_CONFIG_WRITEOC 3
#endif

RE: NRF52840 Problems Reading from QSPI Flash W25q32jv.

Einar Thorsrud — Mon, 13 Jan 2020 14:58:14 GMT

Hi Dhananjay,

Can you explain the issue in a bit more detail?