STM32F4 GPIO Speed Vs External Debounce circuit.

[diyaudio]

It occurred to me that whilst building a typical 4 button push button circuit with rotary encoder, that the inputs to STM32F4 MCU has GPIO speed settings of which 2_Mhz is the lowest reaction time for the PORT to latch, does this mean typical external RC Debouncing maybe be ommited ?

[kony]

Why not just timer polling of the inputs and some majority voting logic for the buttons?
You are very likely running system tick timer with period in the order of 1-10ms anyways.

[JPortici]

the gpio speed affects the slew rate of the output driver.
or does it have an effect on the input too? what does the manual say?

[mikerj]

the gpio speed affects the slew rate of the output driver.
or does it have an effect on the input too? what does the manual say?

AFAIK it only affects the output driver slew rate, nothing to do with the inputs.