[riot-notifications] [RIOT-OS/RIOT] openocd: add debug_adapter gpio (#11175)

JonaRaemdonck notifications at github.com
Wed Mar 13 17:52:36 CET 2019

### Contribution description
Enables the possibility to flash a target using the gpio's of your system (eg. Raspberry Pi) 
This is especially useful inside a continuous integration system where images are flashed onto target to then be tested and interacted with through robot framework because no additional hardware needs to be bought for it to work.

The selection of gpio's happens with some environment variables, SWCLK, SWDIO and RST.
They are assigned default values respectively 21, 20 and 16, because that is the end of the connector on a RPI where there is also a convenient ground pin located to connect to.

### Testing procedure
The new debug_adapter was tested with various apps in the examples directory

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-- Commit Summary --

  * openocd: add debug_adapter gpio

-- File Changes --

    A makefiles/tools/openocd-adapters/sysfsgpio.inc.mk (13)

-- Patch Links --


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