UART RX_PIN_NUMBER issue.

[Neeraj Dhekale]

Hello All,

I am using nrf5_SDK 17.0.2 softdevice. And using this example examples\ble_central\ble_app_uart_c I am able to Tx data from BE33 to external, but I am not able to Rx data from external.

I am using BE33 nRF52833-based controller. I have attached the datasheet of BE33 for your reference.

BE33 Datasheet REV02 - Celium Devices(3)-9.pdf

As you can see in there is no pin number 8 so I have tried to give pin number 4. But it shows the error "Communication error occurred while handling UART". If you tried to change anything from 8. It seems it is not accepting any pin number except 8. My issue is similar to this issue posted here.

Let me know if I am doing anything wrong.

Thanks and regards,

Neeraj Dhekale

[Turbo J]

Did you remember to pull the UART RX pin to "high" (VCC) when not in use?

Otherwise you will likely get a framing error, especially if nothing is connected yet.

[Neeraj Dhekale]

Thank you for your reply.

But I am not keeping UART Rx floating having said it is connected to the external device.

Thanks and regards,

Neeraj Dhekale

[ovrebekk]

Hi Neeraj

How do you connect your module to the external device? 
Are you able to share a picture of your setup? 

Are you sure the external device is running at the same supply voltage as the nRF module? 

Have you tried to probe the RX line with a scope or multimeter to verify that it is high? 
Otherwise you will get a UART error, as mentioned by Jörg. 

Also, have you tested this using an nRF52833DK?

Best regards
Torbjørn

[Jay Tyzzer]

Hello,

In regard to the link you sent on the BE33 module, please review page 8. 

Pin 8 on the module relates to GPIO P0.28 on the Nordic device.  Pin 9 is P0.29.  If you are using the Nordic SDK then I suggest, try changing your code to use the actual GPIO number (minus the P0.  Such as in this case the module's pin 8 should be entered in your firmware as 28.  Good luck

[Neeraj Dhekale]

 Jay Tyzzer 

Thanks for your reply.

I am trying to do the same thing. As per the datasheet attached, I want to give Rx pin that is 17 number but I am giving pin number 4 (that is P0.04). But the surprising thing here is, that any pin number except 8 will give you the error "Communication error occurred while handling UART". That I did not understand.

Thanks and reagards,

Neeraj Dhekale