Control J-Link programmer-supplied power during upload #878
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Add power management commands for upload process
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Some(/all?) J-link programmers can optionally power the target device: https://kb.segger.com/J-Link_Commander#Power
This change allows for control of that power source during the upload step.
After this change, if I put
info my platformio.ini file, the target will be powered up 3 seconds before the normal upload/flash commands and powered down 1 second after.