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RIOT/dist/tools/nrf52_resetpin_cfg/README.md
Hauke Petersen 0ca02de0a2 tools: add nrf52_resetpin_cfg tool 
This new tool allows configuring the reset pin for nRF52-based
boards. As the reset pin configuration is persistent, it does not
make sense to include it into the board code...
2018-09-28 16:50:58 +02:00

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Program the reset pin for nRF52x CPUs

Simply compile, flash, and run this tool on your nRF52x-based board. It will program the given RESET_PIN into the NRF_UICR->PSELRESET registers, hence allowing for hardware resets using a button connected to that pin.

Context

For nRF52x CPUs, the reset pin is programmable. The reset pin configuration is store in two persistent registers, that are programmed in the same way as the CPUs flash memory.

In most cases, these values should be readily programmed when you get your board, and thus do not need to be touched. However, we have seen however a number of nrf52xxxdk boards, where this was not the case and the on-board reset button did have no effect. Running this tool on those boards solves the issue.