Other Parts Discussed in Thread: TM4C123FH6PM
你好！我用的芯片是TM4C123FH6PM，请问：
void
GPIOPinWrite(uint32_t ui32Port, uint8_t ui8Pins, uint8_t ui8Val)
{
ASSERT(_GPIOBaseValid(ui32Port));
HWREG(ui32Port + (GPIO_O_DATA + (ui8Pins << 2))) = ui8Val;
}
的最后一句中问什么要将ui8Pins 左移2位？
