Add option to measure external supply voltage on ADC2
tree582f2de9f4f9488ce0a327a1ff01fc58506927dd
-rw-r--r-- 6383 Makefile.include
-rw-r--r-- 1778 README
-rw-r--r-- 4738 README-BUILDING
-rw-r--r-- 5993 README-EXAMPLES
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