UART in nRF51822 Evaluation kit won't receive

RE: UART in nRF51822 Evaluation kit won't receive

Allan — Thu, 14 Nov 2013 17:57:51 GMT

Thank you, changing the pin configuration did the trick, again thanks a lot for all the support and quick answers.

RE: UART in nRF51822 Evaluation kit won't receive

Hung Bui — Thu, 14 Nov 2013 16:45:41 GMT

@Allan: I suspect that there would be an issue with the physical UART pins (RX, TX; RTS; CTS pins). Could you tried:

Do loopback mode with HWFC = false.
If Error LED still on, please try my attached example, in which I reconfigured the RX and TX pins to P0.00 and P0.01. If you connect them together (the 2 far right pins on P3), the Error LED should not lit up after reset.

uart_example - TestPins.zip

RE: UART in nRF51822 Evaluation kit won't receive

Allan — Thu, 14 Nov 2013 13:42:52 GMT

Thanks for the reply, i followed your suggestiong and used nrf51822_xxaa , and the problem persist, i cheked in degub mode and as you said, i stay in the loop waiting for RXDRDY, i also tried the loopback mode , connecting directly tx and rx and it would give me an error turning on the led. I also cheked that the connections SB9,SB10,SB11 and SB12 are not open.

RE: UART in nRF51822 Evaluation kit won't receive

Hung Bui — Thu, 14 Nov 2013 12:43:21 GMT

Hi Allan,

I am sorry for the late response. I noticed that you might have selected nrf51822_xxaa_s110 in the Target drop down tab. When you select this option you would need to program softdevice at region 0 first because the application code will be flashed at address 0x14000 instead of 0x000000

I would suggest you to use nrf51822_xxaa target instead.

If the issue remains, could you run the device in debug mode and click stop to see the device stay at the loop to wait for NRF_UART0->EVENTS_RXDRDY != 1 ?

RE: UART in nRF51822 Evaluation kit won't receive

Allan — Tue, 12 Nov 2013 18:15:40 GMT

Thanks for the fast reply, here is the code, is one of the ones you provide for the evaluation kit, also if im not mistaken the flow control its enable, HWFC is set to true.

uart_example.rar

RE: UART in nRF51822 Evaluation kit won't receive

Hung Bui — Tue, 12 Nov 2013 17:41:48 GMT

@Allan: Could you upload the example you used ? It should be noted that when using UART with Evaluation Kit, you have to enable hardware flow control.