External Flash W25Q64 with USBD_MSC example on NRF52840

Question

Hi All,

I have an external flash W25Q64 on which I have to mount a file system. I am using USBD_MSC example of NRF52840. My main goal is to create a file inside the flash memory chip. And when USB is plugged into the device it should be seen as a drive on laptop/desktop and I should be able to access the file which was created in the flash chip.I have made the connections on the NRF52840 using the pin configurations below:-

#define SDC_SCK_PIN (25)
#define SDC_MOSI_PIN (23)
#define SDC_MISO_PIN (24)
#define SDC_CS_PIN (15)

I have also configured the details in nrf_serial_flash_params.c file.

static const nrf_serial_flash_params_t m_sflash_params[] = {
    {    
        .read_id = { 0xEF,0x40,0x17 },
        .capabilities = 0x00,
        .size = 8 * 1024 * 1024,
        .erase_size = 2 * 1024,
        .program_size = 256,
    }
};

nrf_serial_flash_params_t const * nrf_serial_flash_params_get(const uint8_t * p_read_id)
{
    size_t i;

    for (i = 0; i < ARRAY_SIZE(m_sflash_params); ++i)
    {
        if (memcmp(m_sflash_params[i].read_id, p_read_id, sizeof(m_sflash_params[i].read_id)) == 0)
        {
            return &m_sflash_params[i];
        }
    }

    return NULL;
}

When I run the example , i get the following error:-

<info> app: Initializing disk 0 (QSPI)...

<error> app: Disk initialization failed.

1) Will this example run for W25Q64 IC??

2) This example also includes FATfs files. Will it automatically create a file system on the external SPI W25Q64 flash memory??

3) Why am I getting "Disk initialization failed." error?

4) Inside sdk_config.h do I also need to enable pin configurations for Qspi??

5) How to test this application? Currently I am using NRF52840 DK and then connecting external spi flash to it. But for USB detection how will it work?

I have attached few files here to check for the configurations

https://devzone.nordicsemi.com/cfs-file/__key/support-attachments/beef5d1b77644c448dabff31668f3a47-07b22aa9f6fe492cbaf5dd082cf33f82/usb_5F00_msc.c

04162.sdk_config.h

5287.W25Q64BV.PDF

Please help me to solve this issue. I need to solve this issue on an urgent basis. Your help will be appreciated. I have also attached W25Q64 datasheet for your reference.

Thanks & Regards,

Snehal

Sigurd · Accepted Answer

Hi, 
 Since you did not provide an event handler to nrf_drv_spi_init(), the call to nrf_drv_spi_transfer() is performed in blocking mode, which means that this function returns when the transfer is finished. I would assume you are stuck in spi_xfer(), waiting for NRF_SPI_EVENT_READY event. But you should debug, and confirm this, As mentioned by Kenneth in e.g. this similar post , make sure that CLK toggle as expected (and is not forced low externally by some electrical issues)