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nRF51422 UART problem

Hello all,

I am using nRFgo motherboard(nRF6310) and nRF51422 DK(s310) and MDK_ARM(keil Version 5 IDE) to build the sample code. It seems workable to program and download code.

Now I'm confused about the UART communication. I am using external usb-com uart modules (based on FT232 chips) for communication with PC (Win7) and putty clients for data send/receive. And I connect P2.0(UART_RX) and P2.1(UART_TX) of nRF6310 to TXO and RXI of external usb-com.

First problem is I want to see the messages from "printf", but I can't see anything from debug(print) viewer. I don't know any setting is needed to add.

Second problem is I use nRFgo Studio to try "direct test mode UART interface", and It displays it occurs error after I put the start test button. (use uart_example and direct test mode example)

Hope anyone can provide me any suggestions or any help. Thanks.

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