stm32f103zet6 串口5无法接收数据

Question

stm32f103zet6 串口5无法接收数据
相同配置下串口3和串口1能够收发数据
不能进入中断函数

/* UART3 Buffer Defines */
#define USART5_RX_BUFFER_SIZE 64     /* 2,4,8,16,32,64,128 or 256 bytes */
#define USART5_TX_BUFFER_SIZE 256     /* 2,4,8,16,32,64,128 or 256 bytes */
#define USART5_RX_BUFFER_MASK ( USART5_RX_BUFFER_SIZE - 1 )
#define USART5_TX_BUFFER_MASK ( USART5_TX_BUFFER_SIZE - 1 )


UartRxBuffer  USART5_Rx_Buffer;

void UartInit(void)
{
    UartBufferInit();
    Uart5Init();
    UartNVIC();  
}

void UartBufferInit()
{      
    USART5_Rx_Buffer.buffer = (u8*)malloc(USART5_RX_BUFFER_SIZE);
    memset(USART5_Rx_Buffer.buffer,0,USART5_RX_BUFFER_SIZE);
    USART5_Rx_Buffer.index = 0;
    USART5_Rx_Buffer.maxSize = USART5_RX_BUFFER_SIZE; 
}

void Uart5Init(void)
{
   RCC_APB1PeriphClockCmd（RCC_APB1 Periph_UART5，ENABLE）；
    USART_InitTypeDef USART_InitStructure;
    USART_InitStructure.USART_BaudRate = 115200;
    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(UART5, &USART_InitStructure);    
    USART_ITConfig(UART5, USART_IT_RXNE, ENABLE);
      USART_Cmd(UART5, ENABLE);
      USART_ClearFlag(UART5, USART_FLAG_TC);  
}

 void UartNVIC(void)
{    
        NVIC_InitTypeDef NVIC_InitStructure;
    NVIC_InitStructure.NVIC_IRQChannel = UART5_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
}

void UART5_IRQHandler(void)
{
    u8 res;
    if(USART_GetFlagStatus(UART5,USART_FLAG_ORE)==SET)
    {
        USART_ClearFlag(UART5,USART_FLAG_ORE);                         
        res = USART_ReceiveData(UART5);
        if(USART5_Rx_Buffer.index < USART5_Rx_Buffer.maxSize)
        {
            USART5_Rx_Buffer.buffer[USART5_Rx_Buffer.index] = res;
            USART5_Rx_Buffer.index ++;
        }
    }    
    if(USART_GetITStatus(UART5, USART_IT_RXNE) != RESET)  
    {
        res =USART_ReceiveData(UART5);    
        if(USART5_Rx_Buffer.index < USART5_Rx_Buffer.maxSize)
        {
            USART5_Rx_Buffer.buffer[USART5_Rx_Buffer.index] = res;
            USART5_Rx_Buffer.index ++;
        }
    } 
    if(USART_GetITStatus(UART5, USART_FLAG_TC) != RESET)
    {
        return ;
    }
}

void IoInit(void)  
{
    //PORTA
     GPIO_InitTypeDef  GPIO_InitStructure;
     RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOC|RCC_APB2Periph_GPIOE|RCC_APB2Periph_GPIOG|RCC_APB2Periph_GPIOF|
     RCC_APB2Periph_GPIOD|RCC_APB2Periph_GPIOB|RCC_APB2Periph_AFIO, ENABLE);     
     GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable, ENABLE);    
    
         
     GPIO_InitStructure.GPIO_Pin= GPIO_Pin_12;
     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
     GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
     GPIO_Init(GPIOC, &GPIO_InitStructure);
     
     GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
     GPIO_Init(GPIOD, &GPIO_InitStructure);
    
}

Answer 1

引自免费微信小程序-皆我百晓生，希望对题主有所帮助，如有帮助，还望采纳。

---

在你提供的代码中，我发现了一些问题。

首先，你没有在代码中实现串口数据的发送功能。在你的UartBufferInit()函数中，你只初始化了接收缓冲区，但没有初始化发送缓冲区。你需要添加以下代码来初始化发送缓冲区：

UartTxBuffer USART5_Tx_Buffer;

void UartBufferInit()
{      
    USART5_Rx_Buffer.buffer = (u8*)malloc(USART5_RX_BUFFER_SIZE);
    memset(USART5_Rx_Buffer.buffer, 0, USART5_RX_BUFFER_SIZE);
    USART5_Rx_Buffer.index = 0;
    USART5_Rx_Buffer.maxSize = USART5_RX_BUFFER_SIZE; 

    USART5_Tx_Buffer.buffer = (u8*)malloc(USART5_TX_BUFFER_SIZE);
    memset(USART5_Tx_Buffer.buffer, 0, USART5_TX_BUFFER_SIZE);
    USART5_Tx_Buffer.index = 0;
    USART5_Tx_Buffer.maxSize = USART5_TX_BUFFER_SIZE; 
}

然后，你的中断服务程序中有一些错误。当USART5_Rx_Buffer.index等于USART5_Rx_Buffer.maxSize时，你不应该继续接收数据，否则可能会导致缓冲区溢出。你需要添加一个条件来检查缓冲区是否已满，并在缓冲区满时停止接收数据。你可以按照以下代码修改你的中断服务程序：

void UART5_IRQHandler(void)
{
    u8 res;
    if(USART_GetFlagStatus(UART5,USART_FLAG_ORE)==SET)
    {
        USART_ClearFlag(UART5,USART_FLAG_ORE);                         
        res = USART_ReceiveData(UART5);
        if(USART5_Rx_Buffer.index < USART5_Rx_Buffer.maxSize)
        {
            USART5_Rx_Buffer.buffer[USART5_Rx_Buffer.index] = res;
            USART5_Rx_Buffer.index ++;
        }
    }    
    if(USART_GetITStatus(UART5, USART_IT_RXNE) != RESET && USART5_Rx_Buffer.index < USART5_Rx_Buffer.maxSize)  
    {
        res = USART_ReceiveData(UART5);    
        USART5_Rx_Buffer.buffer[USART5_Rx_Buffer.index] = res;
        USART5_Rx_Buffer.index ++;
    } 
    if(USART_GetITStatus(UART5, USART_FLAG_TC) != RESET)
    {
        return ;
    }
}

此外，由于UartNVIC()函数中没有包含NVIC_InitStructure的定义和初始化，你需要在该函数之前添加以下代码：

NVIC_InitTypeDef NVIC_InitStructure;

最后，你需要在你的main()函数中调用UartInit()和IoInit()函数来初始化串口和IO口。