Need to use 2 UARTS on nrf52840

RE: Need to use 2 UARTS on nrf52840

Jared — Tue, 12 Feb 2019 09:17:32 GMT

Hi,

Great that it builds without problems! What are you using to program the device? Is any error codes returned?

Best regards

Jared

RE: Need to use 2 UARTS on nrf52840

Abhimanyu K K — Tue, 12 Feb 2019 07:02:53 GMT

Sir I build it. It is build perfectly. But not flashing.

RE: Need to use 2 UARTS on nrf52840

Jared — Fri, 12 Oct 2018 14:03:32 GMT

Could you share your project files?

Jared

RE: Need to use 2 UARTS on nrf52840

Rajat — Fri, 12 Oct 2018 09:50:23 GMT

Hi Jared

The same program and techniquie worked fine for both of the LoRa and Sensor a few days ago.

now its not working as it is supposed to be.

RE: Need to use 2 UARTS on nrf52840

Jared — Fri, 12 Oct 2018 09:29:06 GMT

The reason for the unpredictable behavior that you are observing is because the nRF52840 only have one UART, it does however have two instances of the UARTE. SDK 15.2.0 includes an example serial_uartes which utilizes two UARTEs, i suggest that you take a look at that example to understand how it is supposed to be used: https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v15.2.0%2Fserial_uartes_example.html&cp=4_0_0_4_5_36

Jared

RE: Need to use 2 UARTS on nrf52840

Rajat — Fri, 12 Oct 2018 08:35:03 GMT

[quote userid="6462" url="~/f/nordic-q-a/39406/need-to-use-2-uarts-on-nrf52840/152593"]Are you sure you're not also trying to do debug logging over one of the UARTs ?[/quote]

Umm, Not sure .

How can i check if i am doing that? and also how to disable it?

RE: Need to use 2 UARTS on nrf52840

Rajat — Fri, 12 Oct 2018 07:54:56 GMT

while ((cnf_data[pos++] = uart_read_data ()) != 0x0A)
                {
                     //SEGGER_RTT_printf(0," Stucked Here\r\n");
                    // cnf_data[pos]);
                    // pos++;
                }
            cnf_data[pos] = 0;

            SEGGER_RTT_printf (0, " Data from lora:%s \r\n", cnf_data);

Inside the while statement where i am checking for uart_read_data != 0x0A .

RE: Need to use 2 UARTS on nrf52840

awneil — Fri, 12 Oct 2018 07:52:13 GMT

[quote userid="72088" url="~/f/nordic-q-a/39406/need-to-use-2-uarts-on-nrf52840/152595"]it gets stucked in app_uart_get function[/quote]

So, again: How & Where, exactly, does it get "stuck" in that function?

RE: Need to use 2 UARTS on nrf52840

Rajat — Fri, 12 Oct 2018 07:27:32 GMT

Sensor_read function is using the uart with "uart_init_terra_copy" function and LoRa uses uart_init_terra function.

Whenever the sensor-read function is called ,it works fine but if after that i call lora send function , it gets stucked in app_uart_get function inside the lora send function.

However if i comment out the sensor_read function, it works fine.

                    int k = sensor_read ();
                            if (k == ERROR)
                                {
                                    SEGGER_RTT_printf (
                                        0, "Sensor Read Fail \r\n");
                                }
                                       
                                
                                 test_ack=lora_send ("Test");
          SEGGER_RTT_printf(0,"ACK:%d\r\n",test_ack);
          nrf_delay_ms (15000);

RE: Need to use 2 UARTS on nrf52840

awneil — Fri, 12 Oct 2018 07:22:08 GMT

[quote userid="72088" url="~/f/nordic-q-a/39406/need-to-use-2-uarts-on-nrf52840"]one of the sensor gets stucked[/quote]

How & Where, exactly, does it get "stuck"?

Are you sure you're not also trying to do debug logging over one of the UARTs ?

RE: Need to use 2 UARTS on nrf52840

Jakub Rzeszutko — Fri, 12 Oct 2018 07:22:06 GMT

Hi,