Alex Maclean 147492b253 stm32: Fix ADC for STM32G4
At least STM32G4 requires four ADC clock cycles between hardware
clearing ADCCAL and setting ADEN or the write disappears. Make a
tenacious write attempt.

Signed-off-by: Alex Maclean <monkeh@monkeh.net>
2023-12-21 20:58:57 -05:00
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