Description
This showed up using pin IRQ's but the problem prompted contemplating the general issue. The docs state that the hard arg for Pin.irq() is not supported by all ports. Accordingly the line
xirq = pin_x.irq(trigger=Pin.IRQ_RISING | Pin.IRQ_FALLING, handler=self._x_cb, hard=True)fails on ESP32 with "TypeError: extra keyword arguments given". The obvious (ugly) way to make this portable is to trap the exception and try again without the offending arg. This could become unmanageable if there were multiple args with platform-dependent support.
The best solution is moot. One option would be to accept and silently ignore unsupported args, but this isn't very user friendly. Another would be to accept and ignore the arg, but throw (say) ValueError. Done in such a way as to show which arg is problematic, and in such a way that the handler can be null.
Given that the purpose of machine is to facilitate portability, I think this issue is worth review.