digitalRead/WriteFast to sio_hw->gpio

[neilger]

Per #1067:

#define digitalWriteFast(pin,val) (val ? gpio_set_mask(1 << pin) : gpio_clr_mask(1 << pin))
#define digitalReadFast(pin) gpio_get(pin)

gives an 8.76 MHz ring (at 250 MHz clock);

#define digitalWriteFast(pin,val) (val ? sio_hw->gpio_set = (1 << pin) : sio_hw->gpio_clr = (1 << pin))
#define digitalReadFast(pin) ((1 << pin) & sio_hw->gpio_in)

gives a12.9 MHz ring.

[earlephilhower]

Thanks!