How to resolve the error " NRF_ERROR_NO_MEM " at the case APP_UART_COMMUNICATION_ERROR in uart_event_handle( ) ?

RE: How to resolve the error " NRF_ERROR_NO_MEM " at the case APP_UART_COMMUNICATION_ERROR in uart_event_handle( ) ?

awneil — Tue, 08 Jan 2019 08:08:25 GMT

If it's the same issue, then it will be resolved in the same was as already described.

RE: How to resolve the error " NRF_ERROR_NO_MEM " at the case APP_UART_COMMUNICATION_ERROR in uart_event_handle( ) ?

Unia Kuo — Tue, 08 Jan 2019 03:02:55 GMT

Hi,

I've encountered the same issue when I using the PCA10040. I found that RX can receive normally on P0.08. How to solved this issue?

RE: How to resolve the error " NRF_ERROR_NO_MEM " at the case APP_UART_COMMUNICATION_ERROR in uart_event_handle( ) ?

awneil — Thu, 13 Dec 2018 13:14:22 GMT

Another one today:

devzone.nordicsemi.com/.../161677

RE: How to resolve the error " NRF_ERROR_NO_MEM " at the case APP_UART_COMMUNICATION_ERROR in uart_event_handle( ) ?

Håkon Alseth — Tue, 11 Dec 2018 10:08:27 GMT

I agree with you. I've reported it to the SDK team as a bug.

RE: How to resolve the error " NRF_ERROR_NO_MEM " at the case APP_UART_COMMUNICATION_ERROR in uart_event_handle( ) ?

awneil — Sun, 09 Dec 2018 10:59:32 GMT

Håkon Alseth - but why is the error reported as "NRF_ERROR_NO_MEM" ?

That's clearly nonsense and very misleading!

Please can this be fixed to at least give a relevant error - preferably not a fatal error at all (see below).

RE: How to resolve the error " NRF_ERROR_NO_MEM " at the case APP_UART_COMMUNICATION_ERROR in uart_event_handle( ) ?

awneil — Fri, 07 Dec 2018 14:10:43 GMT

Here's what I did:

        /**@snippet [Handling data from UART] */
        case APP_UART_COMMUNICATION_ERROR:
            NRF_LOG_ERROR("Communication error occurred while handling UART: %08X", p_event->data.error_communication );
            if( p_event->data.error_communication & UART_ERRORSRC_BREAK_Msk )
            {
                NRF_LOG_ERROR("   Break");
            }
            if( p_event->data.error_communication & UART_ERRORSRC_FRAMING_Msk )
            {
                NRF_LOG_ERROR("   Framing");
            }
            if( p_event->data.error_communication & UART_ERRORSRC_PARITY_Msk )
            {
                NRF_LOG_ERROR("   Parity");
            }
            if( p_event->data.error_communication & UART_ERRORSRC_OVERRUN_Msk )
            {
                NRF_LOG_ERROR("   Overrun");
            }
            
            // ### Ignore: APP_ERROR_HANDLER(p_event->data.error_communication);
            break;

Note that you really don't want to call APP_ERROR_HANDLER on this kind of error!!

RE: How to resolve the error " NRF_ERROR_NO_MEM " at the case APP_UART_COMMUNICATION_ERROR in uart_event_handle( ) ?

Håkon Alseth — Wed, 21 Nov 2018 07:58:55 GMT

Hi,

[quote user="tianfei00"]Whether one of methods which adding a pull-up resistor to the GPIO set as RXD in external circuit by myself or configuring "NRF_GPIO->PIN_CNF[RXD_PIN] |=3<<2" is correct ?[/quote]

Both will work just fine. The easiest would be to add a pull-up in firmware, as it's only one line after your UART initialization.

Kind regards,

Håkon

RE: How to resolve the error " NRF_ERROR_NO_MEM " at the case APP_UART_COMMUNICATION_ERROR in uart_event_handle( ) ?

tianfei00 — Wed, 21 Nov 2018 02:18:13 GMT

Dear Håkon,

Firstly, thanks very much for your kind help.

I used P0.08 as RXD. Everytime program die the RXD pin is always floating.

Whether one of methods which adding a pull-up resistor to the GPIO set as RXD in external circuit by myself or configuring "NRF_GPIO->PIN_CNF[RXD_PIN] |=3<<2" is correct ?

Best regards,

tianfei

RE: How to resolve the error " NRF_ERROR_NO_MEM " at the case APP_UART_COMMUNICATION_ERROR in uart_event_handle( ) ?

Håkon Alseth — Tue, 20 Nov 2018 14:07:38 GMT

Hi,

The content of this error is the ERRORSRC register, where 4 indicates "FRAMING" error. This is because there's no stop bit detected externally.

What pins are you using? Is the specific pin floating, or grounded?

Could you try adding a pull-up resistor to the GPIO set as RXD? This is done in NRF_GPIO->PIN_CNF[RXD_PIN], field "PULL".

Kind regards,

Håkon