Hardware requirements for collecting modem traces.

[kk2mkk]

Hi,

As we are in design phase of our custom board based on nRF9160, can you please let us know what all pins needs to be exposed in our design for collecting modem traces?

regards

KK

[Simonr]

Hi

In order to do a modem trace from a custom board, this is done the same way as on the DK, by using the UART1 pins. The only difference is that you need to add a .overlay file in the application file and in your "spm" folder to change the UART1 pins that are used for the modem traces. Note that flow control is not needed to capture a modem trace, so the only pins needed to be exposed are two GPIOs for TX and RX over UART.

Best regards,

Simon

[kk2mkk]

Hi,

Sorry for for delayed response, It took a while to to wire up USB to TTL connector to the DK board.

I am using master copy of serial LTE modem, where I use UART0 which is connected to USB to serial controller of DK board which i used to send the AT commands, so can you please let me know what are the changes i need to make in SPM and application overlay file to redirect TRACES to UART2 ( pins 10 & 11)? or is it that traces only work on UART1 only?

regards

KK

[Simonr]

Hi

Yes, you can configure your project to use another UART (Like UART2 for example). You just have to edit the BSD_LIBRARY_TRACE_ENABLED to select the UART you'd like it to use. Please see this link for reference.

Please note that we're entering the summer vacation period here in Norway, so delays must be expected as we are low on staff for the month of July. Sorry about the inconvenience!

Best regards,

Simon

[kk2mkk]

I think you missed to post the link.

[Simonr]

Yes I did, I'm very sorry about that. I updated my previous reply to contain the correct link.