RTT from external module on nRF52-DK

RE: RTT from external module on nRF52-DK

suricat — Wed, 08 Dec 2021 21:35:50 GMT

So, finally I figured out. As I said before I use PlatformIO as IDE and Zephyr as framework. For printing debug messages I used printk() function and wathced results in PlatformIO terminal. But I missed that terminal shows data as serial monitor and it get this data from uart link between nrf-chip and jlink-programmer chip. When I tried connect to J-Link RTT Viewer I've see nothing and this moment I suspect that my debug messages has transferred not through SWD but through uart.

Problem was fixed after adding

CONFIG_USE_SEGGER_RTT=y
CONFIG_RTT_CONSOLE=y
CONFIG_UART_CONSOLE=n

in prj.conf

RE: RTT from external module on nRF52-DK

suricat — Wed, 08 Dec 2021 15:10:05 GMT

VTG is connected direct to VDD and has the same voltage is 2.832 volts.

With this wiring scheme I can programm external module correctly. But RTT data allways comes from internal chip.

RE: RTT from external module on nRF52-DK

Jared — Wed, 08 Dec 2021 14:33:39 GMT

Hi there,

what voltage do you measure on VTG? Is it equal to VDD? The onboard debugger should bypass the onboard nRF if it sense svoltage on the VTG pin.

regards

Jared