how to use HFCLK in zephyr with nrf52840

RE: how to use HFCLK in zephyr with nrf52840

Jared — Fri, 13 Jan 2023 09:02:40 GMT

Hi,

If you probe the SD lines, are data going in/out any different when you run one thread versus running two? How are they different?

regards

Jared

RE: how to use HFCLK in zephyr with nrf52840

andy — Tue, 10 Jan 2023 01:20:49 GMT

Hi,

I don't think so.If only the thread for writing to the SD card is kept, writing random values to it for a long time will not return an error, but if the SPI receive thread is also enable, it will return an error.

RE: how to use HFCLK in zephyr with nrf52840

Jared — Mon, 09 Jan 2023 15:11:09 GMT

Hi,

It seems like this is the same issue as you were facing here. Can you try to do as my colleague Jørgen already suggested:

Can you check the connections, and have a look at the SPI signals with a scope/logic analyzer, to see if there are noise or signal issues that can explain the behavior?

The -5 error is a IO error, so it could be related to the communication between the SD card and the chip.

RE: how to use HFCLK in zephyr with nrf52840

andy — Sat, 07 Jan 2023 09:51:37 GMT

[quote userid="73165" url="~/f/nordic-q-a/95344/how-to-use-hfclk-in-zephyr-with-nrf52840/403576"]Yes, error -5 is a IO error. Are you able to reproduce the issue when you use the HFINT instead?[/quote]

Yes, this is reproducible, sometimes the program runs a few minutes to appear, sometimes half an hour to appear

RE: how to use HFCLK in zephyr with nrf52840

Jared — Fri, 06 Jan 2023 12:44:06 GMT

Hi,

[quote user="yhua"]Tanks for your reply,The HFCLK has two source the HFINT and the HFXO,the HFINT work in normally.If you need a more accurate clock you can use the HFXO, for exanple radio, is right?[/quote]

Yes, HFXO is more accurate and is mandatory if using the radio.

[quote user="yhua"]Now there is two threads in my project,one thread receive 32bytes data from spi every 160us and put into a ringbuf, another thread get data from the ringbuf and use fs_write to save data to sd card.Do I need to use the HFXO?[/quote]

If you're not using the radio for this then no, using HFINT should be ok.

[quote user="yhua"]

Now i found the fs_write return error -5 from time to time,what is the reason of this error?

I'm sure the IO connection is correct, because the program does not return an error at first, but only after running for a while.

[/quote]

Yes, error -5 is a IO error. Are you able to reproduce the issue when you use the HFINT instead?

regards

Jared

RE: how to use HFCLK in zephyr with nrf52840

andy — Fri, 06 Jan 2023 05:06:18 GMT

Hi Jared:

Tanks for your reply,The HFCLK has two source the HFINT and the HFXO,the HFINT work in normally.If you need a more accurate clock you can use the HFXO, for exanple radio, is right?

Now there is two threads in my project,one thread receive 32bytes data from spi every 160us and put into a ringbuf, another thread get data from the ringbuf and use fs_write to save data to sd card.Do I need to use the HFXO?

Now i found the fs_write return error -5 from time to time,what is the reason of this error?

I'm sure the IO connection is correct, because the program does not return an error at first, but only after running for a while.

RE: how to use HFCLK in zephyr with nrf52840

andy — Fri, 06 Jan 2023 02:49:08 GMT

[quote userid="73165" url="~/f/nordic-q-a/95344/how-to-use-hfclk-in-zephyr-with-nrf52840/403363"]Have you reproduced this on the nRF21540 DK or are you using a custom board?[/quote]

Yes, I test on the nRF21540 DK.

[quote userid="73165" url="~/f/nordic-q-a/95344/how-to-use-hfclk-in-zephyr-with-nrf52840/403363"]Also, it would be great if you can specify where in your code the error happens.[/quote]

the error happen when write data to sd card.This is the debug info,the fs_write() return -5,I think it's hardware IO except the problem,So I handed the problem over to the HW engineer.

    int res;
    res = fs_write(&file, (char *)buf, len);
    // res = f_write(&file, buf, len, &bw);
    if(res < 0)
    {
        printk("rb_length = %d, back_length = %d\n", len, res);
        
        send_message_spi(MES_ERR);
        fs_close(&file);
    }
    res = fs_sync(&file);
    return res;

[quote userid="73165" url="~/f/nordic-q-a/95344/how-to-use-hfclk-in-zephyr-with-nrf52840/403363"]Can you specify what error the HW engineer found?[/quote]

The HW engineer said the that the oscilloscope can not monitor the 32M crystal,and I found no clk signal detected on X1 oscilator.

RE: how to use HFCLK in zephyr with nrf52840

Jared — Thu, 05 Jan 2023 11:21:30 GMT

Hi,

Can you specify what error the HW engineer found?

Also, it would be great if you can specify where in your code the error happens.

Have you reproduced this on the nRF21540 DK or are you using a custom board?

regards

Jared

RE: how to use HFCLK in zephyr with nrf52840

andy — Thu, 05 Jan 2023 08:24:09 GMT

I want to receive data from spi and save to sd card, and after a random time the file write error, the Hardware Engineer found the 32M is not working, So I guess the error has something to do with the 32M crystal not working?

RE: how to use HFCLK in zephyr with nrf52840

Jared — Thu, 05 Jan 2023 08:18:13 GMT

Hi,

Could you elaborate?

What are you trying to do and how are observing that the 32 MHz doesn't work?

regards

Jared

RE: how to use HFCLK in zephyr with nrf52840

andy — Thu, 05 Jan 2023 01:53:07 GMT

I just found the 32M oscilator is not working.

RE: how to use HFCLK in zephyr with nrf52840

Jared — Wed, 04 Jan 2023 10:24:49 GMT

Hi,

The HFCLK is normally configured to be used by default. What exactly are you trying to do with the HFCLK? Are you getting any errors that it hasn't been enabled when you try to use it?

regards

Jared