GPIO的main.c测试程序内有这样一段代码：
EXTI_InitStructure.EXTI_Line = EXTI_Line9;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
设置中断寄存器，而EXTI_Init()的函数中有如下代码：
if (EXTI_InitStruct->!= DISABLE
{
/* Clear EXTI line configuration */ |
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