UARTE data loss on nRF52832 and nRF52840 when using EasyDMA

RE: UARTE data loss on nRF52832 and nRF52840 when using EasyDMA

mark.wayne — Wed, 14 Mar 2018 20:45:38 GMT

I went through everything in your post and it turns out my uart terminal is not capable of sending the big chunk of data I was copy-pasting into it.

When I reduce the size to something that still exercises the buffers it works!

Thank you for pointing me in the right direction!

RE: UARTE data loss on nRF52832 and nRF52840 when using EasyDMA

Edvin — Tue, 13 Mar 2018 13:58:34 GMT

Hello,

I have tried to send 31 * 32 bytes via my uart terminal (maximum allowed transmission by the terminal), and I can't seem to replicate your problem.

I tried to add to your code:

        ...
        counter++;
        if(counter >=31)
        {
            counter = 0;
        }

And it always stops on the breakpoint I placed there after I send the packet. I can also see in the buffers that the data is aligned with the end of the data that I send, so it indicates that I don't loose any data. I have tested it quite a few times. Do you get data loss often? I tried to send 31*32 (=992) bytes about 20 times in a row, and the breakpoint always fired.

Have you configured the sdk_config.h file, or in some other way possibly changed to use the RC Oscillator instead of the crystal? Have you tried to check the RX pin with e.g. a logic analyzer to see if all the data is sent correctly? What device are you sending the UART data from?

Best regards,

Edvin

RE: UARTE data loss on nRF52832 and nRF52840 when using EasyDMA

mark.wayne — Mon, 12 Mar 2018 17:21:39 GMT

Sorry, I've been trying a bunch of things and must have copied the wrong file!

I changed the UART include header in the example above and renamed the pins properly. When I replace main.c in the Blinky example with the code above and add the nrf_drv_common.h/.c file to the project I'm able to compile with uVision.

RE: UARTE data loss on nRF52832 and nRF52840 when using EasyDMA

Edvin — Mon, 12 Mar 2018 14:02:18 GMT

Hello,

Have you changed any files outside the project folder? I am not able to run your application (also after the obvious changes, like p6 and p8).

BR,

Edvin