PIN_CTL1
reg2 = chvgpio_read(sc, PIN_CTL1(pin));
chvgpio_write(sc, PIN_CTL1(pin), reg);
reg = chvgpio_read(sc, PIN_CTL1(pin));
chvgpio_write(sc, PIN_CTL1(pin), reg);
reg2 = chvgpio_read(sc, PIN_CTL1(pin));