GPIODirModeSet中HWREG卡死

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reporter发表于 2013-11-21 13:53 | 只看该作者

GPIODirModeSet中HWREG卡死

stellaris 给出的driverlib里面的一个函数运行程序到GPIODirModeSet时，卡在里面的HWREG中了，报错说是陷入死循环。不知道是为什么，求大神解答。

void
GPIODirModeSet(unsigned long ulPort, unsigned char ucPins,
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;unsigned long ulPinIO)
{
&nbsp; &nbsp; //
&nbsp; &nbsp; // Check the arguments.
&nbsp; &nbsp; //
&nbsp; &nbsp; ASSERT(GPIOBaseValid(ulPort));
&nbsp; &nbsp; ASSERT((ulPinIO == GPIO_DIR_MODE_IN) || (ulPinIO == GPIO_DIR_MODE_OUT) ||
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;(ulPinIO == GPIO_DIR_MODE_HW));

&nbsp; &nbsp; //
&nbsp; &nbsp; // Set the pin direction and mode.
&nbsp; &nbsp; //
&nbsp; &nbsp; HWREG(ulPort + GPIO_O_DIR) = ((ulPinIO &amp; 1) ?
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp; (HWREG(ulPort + GPIO_O_DIR) | ucPins) :
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp; (HWREG(ulPort + GPIO_O_DIR) &amp; ~(ucPins)));
&nbsp; &nbsp; HWREG(ulPort + GPIO_O_AFSEL) = ((ulPinIO &amp; 2) ?
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;(HWREG(ulPort + GPIO_O_AFSEL) | ucPins) :
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;(HWREG(ulPort + GPIO_O_AFSEL) &amp;
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp; ~(ucPins)));
}

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