STM32F051C8T6 使用串口2开启中断接收，程序就卡在启动代码中

wzchenzhe · 发表于 2015-12-16 23:36:44

STM32F051c8t6 使用串口2 不开启接收中断程序可以正常运行，只要开启接收中断程序就不运行用硬件仿真查了一下卡在了启动代码中的
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求各位高手解答

xingnaipeng · 发表于 2015-12-16 23:36:45

faguoduifangui 发表于 2016-8-20 15:40
最后解决了了吗楼主，怎么解决的

解决了。
是因为RCC_APB1Periph_USART2弄错了

wzchenzhe · 发表于 2015-12-16 23:46:06

回复【2楼】yklstudent:
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那怎么解决这个问题呢

wzchenzhe · 发表于 2015-12-16 23:49:11

回复【2楼】yklstudent:
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我不开串口2接收中断程序就不会卡主，难道串口2中断不行吗

lx911gt · 发表于 2015-12-17 08:55:27

USART2我用过啊，没问题的，要么是你配置有问题，要么是中断函数有问题

三叶草 · 发表于 2015-12-17 10:19:15

配置出现的问题

wzchenzhe · 发表于 2015-12-17 10:25:00

回复【5楼】lx911gt:
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你的配置是怎么样的能发来看看吗

wzchenzhe · 发表于 2015-12-17 10:26:43

回复【6楼】三叶草:
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void uart_init2(void){
    //GPIO端口设置
  GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_AHBPeriphClockCmd( RCC_AHBPeriph_GPIOA, ENABLE);
   RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE );
GPIO_PinAFConfig(GPIOA,GPIO_PinSource3,GPIO_AF_1);


    //USART2_RX

A.3
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
   //Usart2 NVIC 配置

    NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPriority = 3;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
   //USART 初始化设置


USART_InitStructure.USART_BaudRate = 2400;//一般设置为2400;
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_Init(USART2, &USART_InitStructure);
USART_Cmd(USART2, ENABLE);                    //使能串口
  USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);//开启中断

wzchenzhe · 发表于 2015-12-17 10:27:39

回复【5楼】lx911gt:
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void  UART2_IRQHandler (void)                 //串口2中断服务程序
{
uint8_t Res;

FM_ON;
if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET)  //接收中断(接收到的数据必须是0x0d 0x0a结尾)
{

Res=USART_ReceiveData(USART2);
if(Res==0xaa)
{
receCount=0;
USART_RX_BUF[receCount]=Res;
}else {
      receCount++;
      USART_RX_BUF[receCount]=Res;
      }

     }
}

wzchenzhe · 发表于 2015-12-17 10:28:41

这是初始化程序
void uart_init2(void){
    //GPIO端口设置
  GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_AHBPeriphClockCmd( RCC_AHBPeriph_GPIOA, ENABLE);
   RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE );
GPIO_PinAFConfig(GPIOA,GPIO_PinSource3,GPIO_AF_1);


    //USART2_RX

A.3
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
   //Usart2 NVIC 配置

    NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPriority = 3;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
   //USART 初始化设置


USART_InitStructure.USART_BaudRate = 2400;//一般设置为2400;
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_Init(USART2, &USART_InitStructure);
USART_Cmd(USART2, ENABLE);                    //使能串口
  USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);//开启中断

}

这是中断程序
void  UART2_IRQHandler (void)                 //串口2中断服务程序
{
uint8_t Res;

FM_ON;
if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET)  //接收中断(接收到的数据必须是0x0d 0x0a结尾)
{

Res=USART_ReceiveData(USART2);
if(Res==0xaa)
{
receCount=0;
USART_RX_BUF[receCount]=Res;
}else {
      receCount++;
      USART_RX_BUF[receCount]=Res;
      }

     }
}

lx911gt · 发表于 2015-12-17 13:12:38

回复【9楼】wzchenzhe:
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这是哪个版本的库？有的没看过，是3.0么？我用的是3.5，不知道里面区别大不大

RX脚我觉得是不是应该设置能浮空输入呢？3.5是GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

还有 GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; 、 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; 没有见过不太明白意思

还可以验证是否真的卡在了usart2接收中断里，板子上有没有LED，或者引出的空引脚，就在中断里将这个引脚设置为某个电平，假如是高电平，不在中断的时候为低电平，或者你自己随便想个办法，这种东西是很好验证的