F28M35 管脚配置的问题

楼主，问题一：

GPIOPinTypeUART(unsigned long ulPort, unsigned char ucPins)
{
    // Check the arguments.
    ASSERT(GPIOBaseValid(ulPort));

    // Make the pin(s) be peripheral controlled.
    GPIODirModeSet(ulPort, ucPins, GPIO_DIR_MODE_HW);

    // Set the pad(s) for standard push-pull operation.
    GPIOPadConfigSet(ulPort, ucPins, GPIO_PIN_TYPE_STD_WPU);
}

GPIOPinConfigure(unsigned long ulPinConfig)
{
    unsigned long ulBase, ulShift, ulAlternatePort;

    // Check the argument.
    ASSERT(((ulPinConfig >> 16) & 0xff) < 9);
    ASSERT(((ulPinConfig >> 8) & 0xe3) == 0);

    // Extract the base address index from the input value.
    ulBase = (ulPinConfig >> 16) & 0xff;

    // Get the base address of the GPIO module, selecting either the APB or the
    // AHB aperture as appropriate.
    if(HWREG(SYSCTL_GPIOHBCTL) & (1 << ulBase))
    {
        ulBase = g_pulGPIOBaseAddrs[(ulBase << 1) + 1];
    }
    else
    {
        ulBase = g_pulGPIOBaseAddrs[ulBase << 1];
    }

    // Extract the shift from the input value.
    ulShift = (ulPinConfig >> 8) & 0xff;

    // Extract Alternate port information
    ulAlternatePort = (ulPinConfig >> 4) & 0xF;

    if(ulAlternatePort != 0)
    {
        HWREG(ulBase + GPIO_O_APSEL) |= 1 << (ulShift>>2);
    }
    else
    {
        HWREG(ulBase + GPIO_O_APSEL) &= ~(1 << (ulShift>>2));
    }

    // Write the requested pin muxing value for this GPIO pin.
    HWREG(ulBase + GPIO_O_PCTL) = ((HWREG(ulBase + GPIO_O_PCTL) &
                                    ~(0xf << ulShift)) |
                                   ((ulPinConfig & 0xf) << ulShift));

}

这是驱动库中这两个函数的源码，源码中看GPIOPinTypeUART指数设置了映射到UART口的GPIO的输入输出，以及上拉推挽模式，

而GPIOPinConfigure函数则是真正的设置GPIO Muxing，并且在这之前会做一系列检测。

问题二：

Jtag和时钟相关的管脚一般不需要配置，除非你需要复用Jtag引脚。