PIN_CTL0
reg1 = chvgpio_read(sc, PIN_CTL0(pin));
chvgpio_write(sc, PIN_CTL0(pin), reg);
reg = chvgpio_read(sc, PIN_CTL0(pin));
chvgpio_write(sc, PIN_CTL0(pin), reg);
reg1 = chvgpio_read(sc, PIN_CTL0(pin));
reg = chvgpio_read(sc, PIN_CTL0(pin));
reg = chvgpio_read(sc, PIN_CTL0(pin));
chvgpio_write(sc, PIN_CTL0(pin), reg);