STM32G0x series multiple GPIO Pin functions

[danielbathtub]

Hi, 

Can I control the level of a GPIO Pin in software, if the GPIO Pin is in an Alternative function mode ? 

For example, I have an application where I switch a MOSFET in Software, but I would like to use the Hardware or internal Silicon, and Software to turn the Pin on and Off, is this possible with the STM32G031 controllers ?. 

Thanks

[Peter BENSCH]

I haven't quite understood exactly what you want to achieve, but GPIOs can of course be switched on or off. If a MOSFET is to be switched, for example to generate a PWM, then a timer peripheral can also do this in hardware.

Does this answer your question?

Regards
/Peter

[Tesla DeLorean]

Either you or a peripheral control the level. If you need to take control, remove it from the peripheral (AF)

If you want to drive a pattern against a port bank, you can DMA into GPIO->BSRR

[Andrew Neil · Accepted solution]

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@Tesla DeLorean wrote:

Either you or a peripheral control the level.

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@danielbathtub - you can see this in Figure 17  in the Reference Manual:

The multiplexer connects either the Output Data Register (ODR) or the Alternate Function (AF) to the output driver.

Figure 20 shows the case when the output is configured as AF:

Note that the ODR is disconnected from the output driver - only the AF is connected.

So your software writing to the ODR in this case will have no effect.