initialiseRaw method
Initialise raw - mraa_gpio_init_raw
Initialise a MraaGpioContext without any mapping to a pin.
The gpioPin
supplied is as listed in SYSFS.
Implementation
MraaGpioContext initialiseRaw(int gpioPin) =>
_impl.mraa_gpio_init_raw(gpioPin + _grovePiPinOffset);