stm32f103vet6一直进不了中断，求大神指点。不用中断串口可以正常使用...

qiuzhicheng · 发表于 2018-5-3 11:10:56

  这是串口中断程序：
void uart_init(u32 bound)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE);

//USART3_TX PB10
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOB, &GPIO_InitStructure);

//USART3_RX  PB11
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOB, &GPIO_InitStructure);

//Usart3 NVIC配置
  NVIC_InitStructure.NVIC_IRQChannel=USART3_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority=3;
  NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
  NVIC_Init(&NVIC_InitStructure);
  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);

//USART 配置
USART_InitStructure.USART_BaudRate = bound;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_Init(USART3, &USART_InitStructure);

USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);  //使能接收中断

USART_Cmd(USART3, ENABLE);
}

void USART3_IRQHandler()
{
u8 n;
static u8 cnt = 0;

if((USART3->SR & 1<<5))    //读数据寄存器非空
{
   n = USART3->DR;
   Uart3_RxBuf[cnt] = n;
if(n == '#')             //发送字符串结束标志
{
Uart3_RxBuf[cnt] = '\0';
Uart3_Rxflag = 1;
cnt = 0;
}
else
{
cnt++;
}
}
}

目前只使用了这一个中断，以前用同一块板子写的中断也不能使用，求各位大神指点迷津

qiuzhicheng · 发表于 2018-5-3 16:21:23

看了这个，解决了问题，谢谢各位的帮助
http://blog.sina.com.cn/s/blog_69ee7b300102v5m6.html

HXYDJ · 发表于 2018-5-3 11:10:57

[mw_shl_code=c,true]void UART3_Init(u32 bound)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
// 1、串口时钟使能 GPIO时钟使能
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);

// 2、串口复位
USART_DeInit(USART3);
// 3、GPIO端口设置
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; //PB10 TX
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;    //复用推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; //PB11 RX
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //浮空输入
GPIO_Init(GPIOB, &GPIO_InitStructure);
// 4、串口参数初始化
USART_InitStructure.USART_BaudRate = bound;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_Init(USART3, &USART_InitStructure);
// 5、初始化NVIC
NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
// 6、开启中断
USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);
// 7、使能串口
USART_Cmd(USART3, ENABLE);
USART_ClearFlag(USART3, USART_FLAG_TC);

}

void USART3_IRQHandler(void)
{
u8 res;
if(USART_GetITStatus(USART3, USART_IT_RXNE) != RESET)
{
      res = USART_ReceiveData(USART3);
      USART_SendData(USART3, res); //把接收到的数据发送出去
}

}[/mw_shl_code]