Receiving for UART with FreeRTOS

RE: Receiving for UART with FreeRTOS

Susheel Nuguru — Fri, 10 Dec 2021 08:09:47 GMT

devzone.nordicsemi.com/.../8321.nrf_5F00_serial.c

RE: Receiving for UART with FreeRTOS

Susheel Nuguru — Fri, 10 Dec 2021 08:03:51 GMT

Hi,

Since the original issue is still unresolved and if you think your issue matches the exact same description, then we can continue our discussion here.

There were issues with nrf_serial working with freeRTOS that was mentioned in the known issues list for SDK15.x (check item 40. in the known issues list)

I see that this was fixed in later SDKs internally but the module was removed for public in latest.

The problem was that nrf_serial was trying to create too many timers which was turning out to be problematic with FreeRTOS.

Can you please try to replace the components\libraries\serial\nrf_serial.c file with the attached one and see if it helps.

Sorry for multiple edits, there is some issue with uploading this file

devzone.nordicsemi.com/.../7215.nrf_5F00_serial.c

RE: Receiving for UART with FreeRTOS

vlockhead — Tue, 07 Dec 2021 13:44:29 GMT

The description of the problem is exactly what I am experiencing. Why should we duplicate the information? I can copy and paste the original ticket in a new ticket if it is absolute necessary

RE: Receiving for UART with FreeRTOS

tesc — Tue, 07 Dec 2021 13:37:42 GMT

Hi!

This thread is quite old. Please create a new thread with your current issue, and an application engineer will have a look at it from our side.

Regards,
Terje

RE: Receiving for UART with FreeRTOS

golgor — Mon, 06 Dec 2021 21:03:19 GMT

No, this issue was never resolved. I did continue with my ugly fixes as it was only a technology demonstrator and something very temporary. I have since long stopped working on this project and I'm currently not working with any Nordic MCUs.

I have received several messages about this so this seems to be an issue for more people. Maybe tesc can help out?

RE: Receiving for UART with FreeRTOS

vlockhead — Mon, 06 Dec 2021 18:53:18 GMT

Hello,

Was this issue ever resolve? I am having the same issue with the SDK-15.2.0

RE: Receiving for UART with FreeRTOS

tesc — Fri, 11 May 2018 09:50:56 GMT

Hi,

I see.

One third of the Norwegian public holidays are in May this year, so our capacity is reduced this month. I suggest that you stick to the solution you have right now for the proof of concept, and I will come back to you as soon as everyone is back in office. As these issues involves both FreeRTOS and the new SDK (with the new nrfx wrappers) I am afraid I have to discuss with several others who are not here at the moment in order to give good advice.

Regards,
Terje

RE: Receiving for UART with FreeRTOS

golgor — Wed, 09 May 2018 13:54:49 GMT

Hello Terje,

Yes, as I said in my post I am aware the solution is very ugly, it was more for demonstrating what the problem was rather than proposing a solution.

I'm mainly looking for a solution of the problem and I'm really confused to what I should use. Is the recommended driver to use for UART the UARTE module in the NRFX-part of the SDK? I.e. "nRF5_SDK_15.0.0\modules\nrfx\drivers\src\nrfx_uarte.c"

If you are interested in deeper knowledge of the problem I have encountered I can share the code in a private case. But if you can recommend another module/library to use I will look more into that solution instead. My super ugly solutions work for now, and I'm only working with a PoC so I will not spend to much time to find a proper fix.

Regards

Robert

RE: Receiving for UART with FreeRTOS

tesc — Wed, 09 May 2018 13:05:45 GMT

Hi,

I am sorry to see that this has been left unanswered for so long.

I have tried to look into these issues, but I am afraid I need some help from a colleague who is out-of-office and will be so for the next two weeks. Hopefully I can come back to you before that, but that I cannot guarantee.

From what I can tell thus far, yes, your proposed workaround in the opening post looks ugly, and I would find it very strange if something like that should be necessary. Are you sure that you have configured the serial port library correctly?

We might need your full project, at least more code, in order to set up, reproduce and investigate further. You may open a private case in order to do so, if confidential. In that case please refer to this thread.

Regards,
Terje

RE: Receiving for UART with FreeRTOS

golgor — Fri, 20 Apr 2018 10:49:18 GMT

I have also found issues when using the app_timer when I know the exact amount of bytes, i.e. I know that I will recieve 10 bytes and thus I set:

err = nrf_serial_read(&serial_uart, tmp_rx, 10, &received_bytes, 100);

The problem at this stage is that the timer is actually not reset when the correct amount of bytes are recieved. I think an "app_timer_stop(*p_serial->p_rx_timer);" should be set also when the expected byte count is recieved such as:

do
    {
        size_t rcnt = serial_rx(p_serial, p_buff, left);
        left -= rcnt;
        p_buff += rcnt;
        if (!left)
        {
            (void)app_timer_stop(*p_serial->p_rx_timer);
            break;
        }

        if (tout_ctx.expired)
        {
            if (p_serial->p_ctx->p_config->mode != NRF_SERIAL_MODE_POLLING)
            {
                nrf_drv_uart_rx_abort(&p_serial->instance);
            }
            break;
        }

        sleep_handler(p_serial);
    } while (1);

In nrf_serial_read() function approx at line 460 to 479 in nrf_serial.c.

I guess there should be a check if the timer is active before trying to stop it, or maybe that doesn't matter...?