arduino
Retrieve current pin mode
There is currently no function to get the current pin mode. A possible implementation is:
int pinMode(uint8_t pin)
{
if (pin >= NUM_DIGITAL_PINS) return (-1);
uint8_t bit = digitalPinToBitMask(pin);
uint8_t port = digitalPinToPort(pin);
volatile uint8_t *reg = portModeRegister(port);
if (*reg & bit) return (OUTPUT);
volatile uint8_t *out = portOutputRegister(port);
return ((*out & bit) ? INPUT_PULLUP : INPUT);
}
The return value is the pin mode or error code (-1) for illegal pin number.
Cheers!
Only negative I can think of is the fact that for some variants the return type of portModeRegister() is of type volatile uint16_t *. On personal projects I have used the auto type specifier to fix this, but I don't know if Arduino is using c++11 by default. For now change I suggest changing it to uint16_t rather than uint8_t
No news on this one? I'd love to have it native! Thanks
If you (or anyone else for that matter) could provide a PR then we'd have something to discuss :wink:
