nrf52840 and s140, using sdk14, UART Example Problem ..

RE: nrf52840 and s140, using sdk14, UART Example Problem ..

MartinBL — Tue, 17 Oct 2017 08:49:14 GMT

I'm not sure if I understand what code you are referring to. If it is the peripheral uart example in our SDKs the uart handler function is there to register possible UART errors. You can also chose to read out the data in the handler or by polling the app_uart_get() function over and over in your main context.

RE: nrf52840 and s140, using sdk14, UART Example Problem ..

jwcheon — Mon, 16 Oct 2017 09:24:56 GMT

Hi, Martin.

I solved the problem. I was aiming to get data using APP_UART_GET () in the body (main.c).

However, it was my problem that I could print on other devices but not read on that device. It turns out that this is due to the "UART_EVENT_HANDLE" set in uart_init. "uart_event_handle" has no data to read in main (main.c) because it already reads data through APP_UART_GET in case APP_UART_DATA_READY when data comes in.

So I commented out the APP_UART_GET part in APP_UART_DATA_READY Case and found that it works properly.

I'm not sure why this code was configured. Do you know?

RE: nrf52840 and s140, using sdk14, UART Example Problem ..

MartinBL — Mon, 16 Oct 2017 08:47:21 GMT

Can you edit your question and add the relevant code?
Have you double checked that you have connected everything correctly? RX-TX, TX-RX, CTS-RTS, RTS-CTS?
Have you connect both devices to common ground?
Are both devices using the same supply voltage?