NRF52840-Dongle PCA10059, UART problem.

RE: NRF52840-Dongle PCA10059, UART problem.

cann0021 — Fri, 25 Oct 2019 10:25:56 GMT

Thank you so much. This is the solution.

RE: NRF52840-Dongle PCA10059, UART problem.

Kenneth — Thu, 24 Oct 2019 13:02:11 GMT

Can you read out the actual content of PSEL.RX register:
https://infocenter.nordicsemi.com/topic/ps_nrf52840/uarte.html?cp=3_0_0_5_33_8_25#register.PSEL.RXD

I think you should use UART_PIN_DISCONNECTED instead of NULL.

RE: NRF52840-Dongle PCA10059, UART problem.

cann0021 — Thu, 24 Oct 2019 12:51:52 GMT

I am using only TX. RX is defined as NULL in my board's header (.h) file. No need to use RX in my case. Will it still cause a problem ?

RE: NRF52840-Dongle PCA10059, UART problem.

Kenneth — Thu, 24 Oct 2019 11:27:22 GMT

I assume it is combination of BREAK and FRAMING error:

https://infocenter.nordicsemi.com/topic/ps_nrf52833/uarte.html?cp=3_1_0_5_31_8_20#register.ERRORSRC

This is common to get if RXD is floating (not connected logic high).

RE: NRF52840-Dongle PCA10059, UART problem.

cann0021 — Thu, 24 Oct 2019 10:34:25 GMT

Hi, thank you for the response. The error I am getting occurs in uart_event_handle() function and in APP_UART_COMMUNICATION_ERROR case. When I print the error code I observe 12(decimal). What does "12" mean ?

RE: NRF52840-Dongle PCA10059, UART problem.

Kenneth — Wed, 23 Oct 2019 14:34:24 GMT

Hi, try to add a pull-up on the RX pin. That said, seems you have an assert, so check out these tutorial on how to add DEBUG to find the file name and line number for the assert:

https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/an-introduction-to-error-handling-in-nrf5-projects