各位大佬好,目前用STM32F030RCT6三个外部中断PA0,PC5,PC12三个外部中断,PA0,PC12都使用正常当我配置PC5的时候就一直进PC12的中断,PC5之前是用作串口3的接收站,单片机STOP模式休眠后PC5用作外部中断 ,代码如下
/**************************************************************
函数名称:uart_exti_init
函数功能:RX引脚配置为外部中断
输入参数:无
返 回 值:无
备 注:无
**************************************************************/
void uart3_exti_init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStruct;
EXTI_InitTypeDef EXTI_InitStruct;
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOC, ENABLE); // GPIOC时钟
/* 关闭UART中断、复位UART、复位GPIO */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, DISABLE);
GPIO_PinAFConfig(GPIOC, GPIO_PinSource5, GPIO_AF_0);
USART_ITConfig(USART3, USART_IT_RXNE, DISABLE);
USART_Cmd(USART3, DISABLE);
GPIO_DeInit(GPIOC);
USART_DeInit(USART3);
//USART3_TX PC4 //USART3_RX PC5
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOC, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5; //按键PC5
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN; //输入模式
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN; //下拉输入
GPIO_Init(GPIOC, &GPIO_InitStructure);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE); //使能系统时钟配置
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOC, EXTI_PinSource5); //连接EXTI5给GPIOC5
EXTI_InitStruct.EXTI_Line = EXTI_PinSource5; //中断线标号5
EXTI_InitStruct.EXTI_Mode = EXTI_Mode_Interrupt; //外部中断模式
EXTI_InitStruct.EXTI_Trigger = EXTI_Trigger_Falling; //下降沿中断EXTI_Trigger_Falling
EXTI_InitStruct.EXTI_LineCmd = ENABLE; //中断线使能
EXTI_Init(&EXTI_InitStruct);
NVIC_InitStruct.NVIC_IRQChannel = EXTI4_15_IRQn;
NVIC_InitStruct.NVIC_IRQChannelPriority = 0x00;
NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStruct);
}
/***************************************
* 函数描述:外部中断初始化
* 输入参数:No
* 返 回 值:No
* 说 明:
* 修改记录:
****************************************/
void EXTI_KEY_Init(void)
{
EXTI_InitTypeDef EXTI_InitStruct;
NVIC_InitTypeDef NVIC_InitStruct;
GPIO_InitTypeDef GPIO_InitStruct;
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOC, ENABLE);
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_12; //按键PC12
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN; //输入模式
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_Level_2;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_DOWN; //下拉输入
GPIO_Init(GPIOC, &GPIO_InitStruct);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE); //使能系统时钟配置
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOC, EXTI_PinSource12); //连接EXTI0给GPIOC0
EXTI_InitStruct.EXTI_Line = EXTI_Line12; //中断线标号0
EXTI_InitStruct.EXTI_Mode = EXTI_Mode_Interrupt; //外部中断模式
EXTI_InitStruct.EXTI_Trigger = EXTI_Trigger_Falling; //下降沿中断EXTI_Trigger_Falling
EXTI_InitStruct.EXTI_LineCmd = ENABLE; //中断线使能
EXTI_Init(&EXTI_InitStruct);
NVIC_InitStruct.NVIC_IRQChannel = EXTI4_15_IRQn;
NVIC_InitStruct.NVIC_IRQChannelPriority = 0x00;
NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStruct);
}
/***************************************
* 函数描述:外部中断12服务程序
* 输入参数:No
* 返 回 值:No
* 说 明:
* 修改记录:
****************************************/
void EXTI4_15_IRQHandler(void)
{
if(EXTI_GetITStatus(EXTI_Line5) != RESET)//判断线5上的中断是否发生,可以理解为标志位
{
EXTI_ClearITPendingBit(EXTI_Line5);//清除LINE5上的中断标志位
}
if(EXTI_GetITStatus(EXTI_Line12) != RESET)//判断线12上的中断是否发生,可以理解为标志位
{
EXTI_ClearITPendingBit(EXTI_Line12);//清除LINE12上的中断标志位
}
}
/*****************************************************
* 函数:对应的串口三初始化
* 参数:baud---波特率设置
* 功能:按照设置初始化串口三
* 备注:
*****************************************************/
void USART3_Init(uint32_t baud)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOC, ENABLE); // GPIOC时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE); //串口3时钟使能
GPIO_PinAFConfig(GPIOC, GPIO_PinSource4, GPIO_AF_1);//PC4-USART3_Tx
GPIO_PinAFConfig(GPIOC, GPIO_PinSource5, GPIO_AF_1);//PC5-USART3_Rx
USART_DeInit(USART3); //复位串口3
//USART3_TX PC4 //USART3_RX PC5
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5; //
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; //复用推挽输出
GPIO_Init(GPIOC, &GPIO_InitStructure); //
USART_InitStructure.USART_BaudRate = baud;//波特率;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字长为8位数据格式
USART_InitStructure.USART_StopBits = USART_StopBits_1;//一个停止位
USART_InitStructure.USART_Parity = USART_Parity_No;//无奇偶校验位
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件数据流控制
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //收发模式
USART_ITConfig(USART3, USART_IT_RXNE, ENABLE); //开启接收中断
// USART_ITConfig(USART3, USART_IT_TXE, ENABLE); //开启发送中断
USART_Init(USART3, &USART_InitStructure); //初始化串口3
//设置中断优先级
NVIC_InitStructure.NVIC_IRQChannel = USART3_6_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPriority = 0x02; //抢占优先级2
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能
NVIC_Init(&NVIC_InitStructure); //根据指定的参数初始化VIC寄存
USART_Cmd(USART3, ENABLE); //使能串口
}
|