Mirror the EXT_PWR_DETECT pattern: replace runtime static variables
(ext_chrg_detect_mode, ext_chrg_detect_value) with compile-time macros.
Auto-infer EXT_CHRG_DETECT_VALUE from EXT_CHRG_DETECT_MODE when the mode
is INPUT_PULLUP (→ LOW) or INPUT_PULLDOWN (→ HIGH); default to HIGH.
This fixes inverted polarity on variants that define EXT_CHRG_DETECT_MODE
INPUT_PULLUP without an explicit EXT_CHRG_DETECT_VALUE (e.g. russell):
previously the runtime default of HIGH caused isCharging() to return the
opposite of the correct value. With auto-inference the correct LOW active
level is now derived at compile time.
Remove the now-redundant EXT_CHRG_DETECT_VALUE HIGH from ELECROW-ThinkNode-M4
variant.h since HIGH is the inferred default.
Assisted-by: Claude Sonnet 4.6 <noreply@anthropic.com>
Signed-off-by: Andrew Yong <noreply@example.com>
Co-authored-by: Jonathan Bennett <jbennett@incomsystems.biz>
2ed7bba5e7