stm32f407 外部中断函数总是被执行是怎么回事下面程序中总是输出 5 ，有知道的请帮回答下呗 （谢谢）废话不多说上源码：
//初始化函数
//初始化 EXTILine6
void EXTILine6_init(void)
{
EXTI_InitTypeDef EXTI_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
/* Enable GPIOB clock */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
/* Enable SYSCFG clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
/* Configure PB6 pin as input floating */
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Connect EXTI Line6 to PA6 pin */
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource6);
/* Configure EXTI Line6 */
EXTI_InitStructure.EXTI_Line = EXTI_Line6;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
/* Enable and set EXTI Line6 Interrupt to the lowest priority */
NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0f;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0f;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
//初始化 EXTILine7
void EXTILine7_init(void)
{
EXTI_InitTypeDef EXTI_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
/* Enable GPIOB clock */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
/* Enable SYSCFG clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
/* Configure PB7 pin as input floating */
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
GPIO_Init(GPIOB, &GPIO_InitStructure);
/* Connect EXTI Line7 to Pb7 pin */
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOB, EXTI_PinSource7);
/* Configure EXTI Line0 */
EXTI_InitStructure.EXTI_Line = EXTI_Line7;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising_Falling;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
/* Enable and set EXTI Line7 Interrupt to the lowest priority */
NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0f;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0f;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
//中断函数
void EXTI9_5_IRQHandler(void)
{
u32 i = 0;
if(EXTI_GetITStatus(EXTI_Line7) != RESET) //检查指定的EXTI7线路触发请求发生与否
{
SerialPutChar(0xf);
if(GPIOB->IDR & (1<< 7))
{ //上升沿->高电平->有效场同步信号
EXTI->IMR |= EXTI_Line6; //使能像素同步中断
EXTI->EMR |= EXTI_Line6;
VsyncActive = 1;
}
else
{ //下降沿->场同步信号结束
EXTI->IMR &= ~EXTI_Line6; //关闭像素同步中断
EXTI->EMR &= ~EXTI_Line6;
if(VsyncActive == 1)
{ //已经经历了一个完整的场同步阶段
VsyncActive = 2;
EXTI->IMR &= ~EXTI_Line7; //关闭场同步中断
EXTI->EMR &= ~EXTI_Line7;
}
else
{
// SerialPutChar('e');
VsyncActive = 0;
}
}
EXTI_ClearITPendingBit(EXTI_Line7); //清除EXTI0线路挂起位
EXTI_ClearFlag(EXTI_Line7);
} // 7 6 5 4 3 2 1 0
if(EXTI_GetITStatus(EXTI_Line6) != RESET)
{
// JpegBuffer[JpegDataCnt++] = (u8)(((GPIOC->IDR & 0xc0) >> 6) | ((GPIOE->IDR & 0x03) << 2)
// | (GPIOE->IDR & 0x10) | ((GPIOB->IDR & 0x40)>>1)|((GPIOE->IDR & 0x60)<<1)); //存储数据
SerialPutChar(0xff);
EXTI_ClearITPendingBit(EXTI_Line6); //清除EXTI0线路挂起位
EXTI_ClearFlag(EXTI_Line6);
}
if(EXTI_GetITStatus(EXTI_Line5) != RESET)
{
EXTI_ClearITPendingBit(EXTI_Line5);
SerialPutChar(0x02);
}
if(EXTI_GetITStatus(EXTI_Line8) != RESET)
{
EXTI_ClearITPendingBit(EXTI_Line8);
SerialPutChar(0x03);
}
if(EXTI_GetITStatus(EXTI_Line9) != RESET)
{
EXTI_ClearITPendingBit(EXTI_Line9);
SerialPutChar(0x04);
}
SerialPutChar(0x05);
} |
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