[riot-notifications] [RIOT-OS/RIOT] boards/esp32: changes the approach for configurations of ADC channels in board definitions (#11289)

Gunar Schorcht notifications at github.com
Fri Mar 29 19:20:27 CET 2019

@leandrolanzieri Hm, ... `periph/adc.c` is part of module `periph` and is always compiled. For `test/periph_adc` the compilation in mrudock doesn't fail since it requires feature `periph_adc` which is not provided by `esp32-olimex-evb`. But for all other application `periph_adc` isn't required. That's why they fail in murduck with something like:
cpu/esp32/periph/adc.c:173:27: error: comparison of unsigned expression < 0 is always false [-Werror=type-limits]
     CHECK_PARAM_RET (line < ADC_NUMOF, -1)
And now I remember that this was the reason why I had the variable `adc_channel_num` in addition to the macro `ADC_NUMOF`. The check against the varaiable doesn't fail during compilation. 

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