RF52840 Two instances of UART/UARTE

RE: RF52840 Two instances of UART/UARTE

Vidar Berg — Tue, 28 Jul 2020 08:02:13 GMT

As Simon said, you can use the already included UART driver to configure the second UART instance. Just remember to enable 'UART1_ENABLED' in sdk_config.h first.

RE: RF52840 Two instances of UART/UARTE

Simon — Thu, 23 Jul 2020 01:02:32 GMT

Currently, due to summer vacation, we are low on staff, and you may experience delayed answers.

I will just copy in some answers I found in some other tickets initially. Tomorrow/friday I will take a deeper look into your questions and try to give a more comprehensive answer

"app_uart does not support two UARTs. UARTE1 should be accessed through the driver while UARTE0 may be accessed through app_uart or the driver."

"I think it's easier to use the UART driver directly instead of using the Serial library for the second UART instance. Anyway, please try to build and debug the "Debug" target, it will give you a more verbose error message." (this was from a case where a customer was trying to do the same as you).

Take a look at the UART driver in the documentation: https://infocenter.nordicsemi.com/index.jsp?topic=%2Fsdk_nrf5_v17.0.0%2Fhardware_driver_uart.html&cp=7_1_2_0_19

Best regards,

Simon

RE: RF52840 Two instances of UART/UARTE

Dermot Murphy — Tue, 21 Jul 2020 10:54:43 GMT

Sorry I have no idea what the first UART is connected to in the BLE UART example.

I would refer you to the Nordic example quoted in the question.

To me, it appears to be used for transmitting debug data as a call is made in the example code to app_uart_put from the nus_data_handler handler which is handling the data received over BLE. As a guess, I would say it is going out via the USB connection to the Segger Terminal.

Either way, I am not interested in the BLE usage of the UART it has initialised.

I only am interested in adding a second UART/UARTE to support the sensor on my PCB.

Thanks

Dermot

RE: RF52840 Two instances of UART/UARTE

awneil — Tue, 21 Jul 2020 10:46:14 GMT

[quote userid="92093" url="~/f/nordic-q-a/63990/rf52840-two-instances-of-uart-uarte/260967"]the first UART is connected to the BLE[/quote]

This is the bit that doesn't make sense:

The BLE is entirely internal to the SoC - so what is the first UART actually connecting to outside the SoC ?

In the examples, it is simply used for demo purposes to connect to a terminal on the developer's PC.

It seems that it may be unnecessary in your application.

Again, a diagram may help.

RE: RF52840 Two instances of UART/UARTE

Dermot Murphy — Tue, 21 Jul 2020 10:34:29 GMT

Hi,

I wish to add a second UART/UARTE to communicate with a device on my PCB.

To answer your question, the first UART is connected to the BLE (refer to the example quoted), and I wish this to remain unchanged.

Thanks

Dermot

RE: RF52840 Two instances of UART/UARTE

awneil — Tue, 21 Jul 2020 10:29:38 GMT

So what will be connected to the first UART on your PCB ?

EDIT

A diagram might help ...

RE: RF52840 Two instances of UART/UARTE

Dermot Murphy — Tue, 21 Jul 2020 10:19:11 GMT

Hi,

Thanks for your reply.

What I mean is that the BLE example code already uses one UART to provide serial comms over BLE. I wish this to remain unchanged - that is the first instance of the UART initialised in the example, will remain unchanged in that it is still attached to the BLE code in the example.

I basically want the BLE example unchanged, and just add a second instance of serial comms (UART/UARTE) which I want to use with a sensor on my PCB.

Thanks

Dermot

RE: RF52840 Two instances of UART/UARTE

awneil — Tue, 21 Jul 2020 10:04:17 GMT

[quote userid="92093" url="~/f/nordic-q-a/63990/rf52840-two-instances-of-uart-uarte"]The first instance will remain attached to the BLE[/quote]

Not sure what you mean by that ?