TM4C123GH6PM QEI

void QEIConfigure (uint32_t ui32Base, uint32_t ui32Config, uint32_t ui32MaxPosition)

应该是这句吧，和QEI有关的库函数本来就没几个，带参数的就更少了。

我觉得应该不是那个，我把它设为0也能计数脉冲，而且它的解释是重置位置捕捉应该与方向有关...

找到了，是这个函数，他的函数原型如下：

QEIVelocityConfigure(uint32_t ui32Base, uint32_t ui32PreDiv,
                     uint32_t ui32Period)
{
    //
    // Check the arguments.
    //
    ASSERT((ui32Base == QEI0_BASE) || (ui32Base == QEI1_BASE));
    ASSERT(!(ui32PreDiv & ~(QEI_CTL_VELDIV_M)));
    ASSERT(ui32Period != 0);

    //
    // Set the velocity predivider.
    //
    HWREG(ui32Base + QEI_O_CTL) = ((HWREG(ui32Base + QEI_O_CTL) &
                                    ~(QEI_CTL_VELDIV_M)) | ui32PreDiv);

    //
    // Set the timer period.
    //
    HWREG(ui32Base + QEI_O_LOAD) = ui32Period - 1;
}