Runtime Mode change of PIN

[drahnr]

Description

I have a set of pins which are re=used depending on the operation mode (SPI, I2C, GPIO IRQ, ADC, DigitalOut).

What is the desired way of doing this in mbed os?

If I utilize a PIN as DigitalOut, which de-allocates with a scope and afterwards allocate again with DigitalIn.
What is the state while it is not allocated? Is it going back to the default state (and where is that defined?)

Issue request type

[X] Question
[ ] Enhancement
[ ] Bug

[ciarmcom]

ARM Internal Ref: MBOTRIAGE-928

[0xc0170]

What is the state while it is not allocated? Is it going back to the default state (and where is that defined?)

This is not yet defined, but should be. This will be address by the specs update for all HAL (including those you are using). ctor initializes it for specific functionality, but not all drivers call free (so dtor is empty). Therefore the state is preserved. The answer would be, state changes only on initialization.

@ARMmbed/mbed-os-core Please review

[drahnr]

It would be greate if there would be a convert_to<DigitalOut>(PinConvertible) where all the Pin types derive from the PinConvertiable base, and depending ton the Pin this works or doesn't (runtime check) (just a quick idea though)

[deepikabhavnani]

This is duplicate of #3106.

Since destructor code is empty, deallocation is not done.