Problem with UART Communication

[nikola]

Hi,
I am trying to test the uart exemple on nrf52840 using external debugging as shown in figure but it doesn't function !!!!

are there any modifications that need to be added compared to the internal debugging mode or is it the same thing?

[Jared]

Hi,

What board are you're flashing the UART example on? 

 

are there any modifications that need to be added compared to the internal debugging mode or is it the same thing?

 Yes, you need to change the board map file so that the pins on fits the board that you're using. 

regards

Jared

[nikola]

I am flashing the example on the board nrf52832 and I put the connection of pins as following

Rx==> P08 (Pins of nrf52840)

Tx==>P06

CTS==>P07

RTS==>P05

then I put modification on the file pca10040.h to get the correspendant pin of nrf52840 but it doesn't function .

[Jared]

Hi,

If I understand you correctly.: You are flashing the red board which has a nRF52840 with the UART example from the SDK. You also flash the a nRF52 DK with the example, and try to connect the two. Is my understanding correct?

The image that you shared shows that you have connected the nRF52840 based board to the P20 header on the nRF52 DK. The P20 header can not be used for UART, they are used to debug an external board. 

Pin 23, 22, 20 is located on the header over P20. 

regards

Jared 

[nikola]

yes I have already modified the pins as follows

and it works in the segger terminal using RTT but the serial communication does not take place, that is to say when I try to test with putty it does not work