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  • Case ID: 119581
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nrf51 wont run without debugger

Jim Peschke

Have an nrf51 board design that doesn't want to run without a debugger. When programmed, the debugger can run the board. When the debugger is removed, the board does not seem to run at all.

The SWDCLK line has a 12k pulldown. The SWDIO line has a 12k pullup. I suspect these pins, especially SWDIO, might be the culprit. Sometimes I can get the board running by touching SWDIO with an oscilloscope probe.

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    Yes, I have an external 12k pullup on SWDIO and a 12k pulldown on SWDCLK. I am not the software developer. I know that the application we are testing on now uses the softdevice. The chip very much acts like its stuck in an undefined state until the SWDIO/RESET line is moved. I am asking the software developer to test this my manually cycling the SWDIO/RESET line.

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    Yes, I have an external 12k pullup on SWDIO and a 12k pulldown on SWDCLK. I am not the software developer. I know that the application we are testing on now uses the softdevice. The chip very much acts like its stuck in an undefined state until the SWDIO/RESET line is moved. I am asking the software developer to test this my manually cycling the SWDIO/RESET line.

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