/**
* A lookup table from the actual pin number to GPIO number.
* e.g P8_13 is g_pin_real_to_gpio[0*46+13] = g_pin_real_to_gpio[13]
/**
* A lookup table from the actual pin number to GPIO number.
* e.g P8_13 is g_pin_real_to_gpio[0*46+13] = g_pin_real_to_gpio[13]