Floating pin reading as high (DAL has pull downs)

[microbit-carlos]

This programme in V1 DAL always reads the pin a floating pin as "low", until a jumper cable is used to connect it to the 3V pin.

#include "MicroBit.h"

MicroBit uBit;

int  main() {
    uBit.init();
    // uBit.io.P1.setPull(PullMode::Down);
    while (1) {
        if (uBit.io.P1.getDigitalValue() == 1) {
            uBit.display.printChar('H');
            uBit.sleep(400);
        } else {
            uBit.display.printChar('L');
            uBit.sleep(400);
        }
    }
}

The sleep is not required, it also shows that in V2 CODAL the first reading of the pin is always 0, as on reset it always it shows the L on the display once and then stays H.

Uncommenting the pull down matches the V1 DAL behaviour.

Tested P0,P1, P12, and P16, so I assume this is probably true for all io.

[martinwork]

Related: #17

[microbit-carlos]

Thanks Martin, didn't see that issue when I opened this. As it is essentially the same I'll close this one to concentrate the conversation over there.