Uart communication with rn2483 LORA module

[ilkobg]

Hello, 

I want to establish an UART communication with rn2483 module with nrf52-DK, SDK 15.2.0

On nrf52-DK, pins 6 and 8 are reserved for serial port, which are connected to the on-board MCu. I want to know if I can use these pins to communicate with the lora module? Because this is the only way I can use the serial port to the PC, to be able to debug. 

I tried to use pins 6 and 8, but I can't read the response from the lora module and I don't know if there is actually communication. 

[awneil]

ilkobg said:

On nrf52-DK, pins 6 and 8 are reserved for serial port, which are connected to the on-board MCu

Correct.

ilkobg said:

I want to know if I can use these pins to communicate with the lora module?

You have 2 choices:

1. Use those pins, and disconnect the on-board MCU (the J-Link) from them;
2. Use different pins.

The User Guide has instructions on how to disconnect the on-board MCU.

You should also study the Schematics to see what's connected where.

ilkobg said:

I tried to use pins 6 and 8, but I can't read the response from the lora module and I don't know if there is actually communication. 

That won't work - the LoRa module's transmitter will be "fighting" the on-board J-Link's transmitter.

Again, you need to disconnect the on-board J-Link from the UART pins - or use different pins.

[awneil]

See here for tips on debugging serial comms in general:

https://www.avrfreaks.net/comment/2306116#comment-2306116

https://www.avrfreaks.net/comment/2336161#comment-2336161

Note the use of two terminals - so that you can see both Rx & Tx data ...

And an oscilloscope is invaluable.