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nrf5340dk etm trace get no data

Hi there

I mount the 19pin connector on nrf5340dk board and connect to segger j-trace pro . The debugger function work well. 

Later i modify the nrf9160 etm trace project from segger , replace the correspondence sdk file and define the required variable definition for nrf5340.  wiki.segger.com/.../nRF91_Series_Devices

It compile and download ok under SES. When i switch to the ozone and set the trace settings to 4bits and 64MHz cpu clock then break into one breakpoint , the instruction trace get no data at all.

The j-tag trace pro adapter have been verified with one trace reference board with stm32f407ve from segger. The j-tage pro ETM trace function have no problem on this reference board under Ozone and IAR c-spy.  

I try to modify the TAD registers and do some study , the pin and clock frequency control registers  does work functional . But the  clockstart and clockstop have no effect on  clock. The trace clk always output clock and the clock frequency have shifted a little from the specified target frequency. 

Can you provide one ETM trace example for nrf5340dk ? 

  

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