Two UART's pin configuration in nRF52833 QFN40

[Sai Mukesh]

Hi,

     I want to develop a device using nRF52833. I am using QFN40, so can I use two UART connections. If yes, then what are the Tx, Rx pins for both the UART's

[Jørgen Holmefjord]

The nRF52833 DK has its own built-in debugger, there should not be any need to program it from the nRF52840 DK, but it should be possible to program by connecting 10-pin cable between "Debug out" (P19) and "Debug in" (P18). You need to make sure both DKs are powered through the IMCU USB connector (J2) before programming.

Note that it is not possible to use P20 as debug input on the DKs.

[Sai Mukesh]

we tried the same process but we are not able flash the program. do we need to do any changes in the firmware, we are using the vs code as ide so is there any specific changes needed or even though tried same with of on old nrf52833 soc but it also failed .please suggest any alternatives or step by step approach to follow 

[Sai Mukesh]

According to the documentation, when we short the SB47 solder bridge, it's supposed to prevent the internal System-on-Chip (SoC) from being detected and working. However, when we attempted to do this, we found that the program was still successfully flashed, and we were able to debug it.
This raises questions about why this happened and whether it might cause issues when flashing programs to external devices. Could you please clarify this matter for us? We want to ensure that everything is functioning correctly and avoid any potential problems.

[Jørgen Holmefjord]

On which DK did you short SB47? Have you verified that it is shorted properly?

Can you post a picture of your connections, and the logs from programming? 

You can read out the register at address 0x10000100 to check which device is connected to the debugger:

nrfjprog --memrd 0x10000100
0x10000100: 00052833                              |3(..|