nRF52 dk as UART module to connect custom board

[shmuel.d]

Hi,

We have custom board with nRF52832.

For regulation, we want to use radio_test example.

In order to do that, I am trying to make the nRF52DK a COM PORT and connect my custom board through UART

I connected 4 UART pins from custom board (We have ICT for pins 5,6,7,8) to the related pins on the DK, cut SB22,23,24,25, erased software from DK and installed radio_test on custom board.

I followed instructions and opened termite 3.4 and it didn't work.

I connected Vdd and GND through Power supply. tried to turn off/on but didnt get the message "RF test" as it supposed to.

In our project pins 5,6,7,8 assigned to *** components so I unmounted them from board so they d'ont interfere.

Thanks

[awneil]

Wouldn't it be simpler just to use an ordinary off-the-shelf USB-to-UART module or cable?

eg,

https://www.ftdichip.com/Products/Cables/USBTTLSerial.htm

 https://www.ftdichip.com/Products/Modules/DevelopmentModules.htm

[Kenneth]

You don't need to cut any wires, as long as the nRF52832 chip on-board don't control the pins (for instance erase the chip by 'nrfjprog --eraseall' will cause pins 5, 6, 7 and 8 to floating state), then you can directly connect  the UART pins on your board to the pin header on the nRF52-DK. In addition you need to connect GND on your board to the DK, and have the same supply range (around ~3V).

If that doesn't work then you likely need to have a logic analyzer to check if you can see data on both TXD and RXD lines, and possible hardware flow control pins if enabled.

Best regards,
Kenneth

[shmuel.d]

Thanks, it worked