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GPIO configuration primer under STM32CubeMX

Question asked by Aeneas on Aug 22, 2015
Latest reply on Aug 25, 2015 by Aeneas
Is there a document that describes the selection of push pull, open drain,
maximum output speed, AHB clock, etc   for GPIO port operation
 on STM32F427xx under STM32CubeMX ?
The datasheets for the chips on the PCB to which  the GPIO pins are connected
do not state explicitly a requirement of one or the other of these
 PIO configuration selections.
I am not seeing any output, though the RCC clock is activation
and another port is inputting successfully.