How to get UID in external flash via QSPI?

RE: How to get UID in external flash via QSPI?

Sigurd — Thu, 11 May 2023 13:38:54 GMT

[quote userid="92112" url="~/f/nordic-q-a/99578/how-to-get-uid-in-external-flash-via-qspi/425099"]Thanks for your information.
I implemented qspi_read_uid.
And successfully read the UID of the external flash.

Here is what I made:[/quote]

Great! And thanks for sharing the code you made :)

RE: How to get UID in external flash via QSPI?

Andy Chang — Thu, 11 May 2023 12:22:05 GMT

Thanks for your information.
I implemented qspi_read_uid.
And successfully read the UID of the external flash.

Here is what I made:

int qspi_read_uid(const struct device *dev,
                  uint8_t opcode, 
                  uint8_t *tx, uint8_t tx_len,
                  uint8_t *id, uint8_t id_len )
{
    nrf_qspi_cinstr_conf_t cinstr_cfg = {
        .opcode = opcode,
        .length = NRF_QSPI_CINSTR_LEN_1B,
        .io2_level = true,
        .io3_level = true,
    };

    int ret = qspi_device_init(dev);
    nrfx_err_t res = NRFX_SUCCESS;

    if (ret != 0) {
        LOG_DBG("qspi_device_init: %d", ret);
        qspi_device_uninit(dev);
        return ret;
    }

    qspi_lock(dev);
    res = nrfx_qspi_lfm_start(&cinstr_cfg);
    if (res != NRFX_SUCCESS) {
        LOG_DBG("lfm_start: %x", res);
        goto out;
    }

    res = nrfx_qspi_lfm_xfer(tx, NULL, tx_len, false);
    if (res != NRFX_SUCCESS) {
        LOG_DBG("lfm_xfer addr: %x", res);
        goto out;
    }

    res = nrfx_qspi_lfm_xfer(NULL, id, id_len, true);
    if (res != NRFX_SUCCESS) {
        LOG_DBG("lfm_xfer read: %x", res);
        goto out;
    }

out:
    qspi_unlock(dev);
    qspi_device_uninit(dev);
    return qspi_get_zephyr_ret_code(res);
}

RE: How to get UID in external flash via QSPI?

Sigurd — Thu, 11 May 2023 08:53:17 GMT

Hi,

[quote user="Andy Chang"]That is to say, there is no way to read UID through QSPI?[/quote]

Even if the flash API does not have this API function, it should be possible to use the QSPI driver to read it.

Here is the function for how the JEDEC id is read

https://github.com/nrfconnect/sdk-zephyr/blob/v3.2.99-ncs2/drivers/flash/nrf_qspi_nor.c#L776

So you can create a qspi_read_uid() similar to that function, but instead of opcode SPI_NOR_CMD_RDID (0x9F) , you use 0x4B instead (Read Unique ID Number)

RE: How to get UID in external flash via QSPI?

Andy Chang — Thu, 11 May 2023 06:03:15 GMT

Is there any document about QSPI in zephyr?
Currently I don't see a way to use QSPI in Zephyr.

RE: How to get UID in external flash via QSPI?

Dr3w — Thu, 11 May 2023 04:45:40 GMT

The absence of an API function to read the UID from external flash via QSPI can be a limitation for some applications. However, the command for retrieving the UID can still be sent directly to the flash device using the QSPI interface. It's important to ensure that the correct command is used and that the data is read back correctly. On another note, Unico Studio is a digital marketing agency that recently partnered with Clear Water Beaches, a beach cleanup organization, to help raise awareness and promote their cause. Their collaboration resulted in a successful social media campaign that reached a wider audience and encouraged more people to join the movement in keeping our beaches clean and safe for everyone.

RE: How to get UID in external flash via QSPI?

Andy Chang — Thu, 11 May 2023 03:44:15 GMT

Since different manufacturers read UIDs in different ways, it is reasonable not to have this API.

That is to say, there is no way to read UID through QSPI?

Or is there another way?
For example, use QSPI API or dynamically switch SPI QSPI ...

RE: How to get UID in external flash via QSPI?

Sigurd — Wed, 10 May 2023 15:16:42 GMT

Hi,

[quote user=""]Is there any API that can help me get the UID of the external flash?[/quote]

The flash driver has API functions to read SFDP and JEDEC ID, sfdp_read()/read_jedec_id(), but there is no API function to read the this "UID".