串口

1 相关串口库函数

/* Exported macro ------------------------------------------------------------*/
/* Exported functions --------------------------------------------------------*/  

/*  Function used to set the USART configuration to the default reset state ***/
void USART_DeInit(USART_TypeDef* USARTx);

/* Initialization and Configuration functions *********************************/
void USART_Init(USART_TypeDef* USARTx, USART_InitTypeDef* USART_InitStruct);
void USART_StructInit(USART_InitTypeDef* USART_InitStruct);
void USART_ClockInit(USART_TypeDef* USARTx, USART_ClockInitTypeDef* USART_ClockInitStruct);
void USART_ClockStructInit(USART_ClockInitTypeDef* USART_ClockInitStruct);
void USART_Cmd(USART_TypeDef* USARTx, FunctionalState NewState);
void USART_SetPrescaler(USART_TypeDef* USARTx, uint8_t USART_Prescaler);
void USART_OverSampling8Cmd(USART_TypeDef* USARTx, FunctionalState NewState);
void USART_OneBitMethodCmd(USART_TypeDef* USARTx, FunctionalState NewState);

/* Data transfers functions ***************************************************/
void USART_SendData(USART_TypeDef* USARTx, uint16_t Data);
uint16_t USART_ReceiveData(USART_TypeDef* USARTx);

/* Multi-Processor Communication functions ************************************/
void USART_SetAddress(USART_TypeDef* USARTx, uint8_t USART_Address);
void USART_WakeUpConfig(USART_TypeDef* USARTx, uint16_t USART_WakeUp);
void USART_ReceiverWakeUpCmd(USART_TypeDef* USARTx, FunctionalState NewState);

/* LIN mode functions *********************************************************/
void USART_LINBreakDetectLengthConfig(USART_TypeDef* USARTx, uint16_t USART_LINBreakDetectLength);
void USART_LINCmd(USART_TypeDef* USARTx, FunctionalState NewState);
void USART_SendBreak(USART_TypeDef* USARTx);

/* Half-duplex mode function **************************************************/
void USART_HalfDuplexCmd(USART_TypeDef* USARTx, FunctionalState NewState);

/* Smartcard mode functions ***************************************************/
void USART_SmartCardCmd(USART_TypeDef* USARTx, FunctionalState NewState);
void USART_SmartCardNACKCmd(USART_TypeDef* USARTx, FunctionalState NewState);
void USART_SetGuardTime(USART_TypeDef* USARTx, uint8_t USART_GuardTime);

/* IrDA mode functions ********************************************************/
void USART_IrDAConfig(USART_TypeDef* USARTx, uint16_t USART_IrDAMode);
void USART_IrDACmd(USART_TypeDef* USARTx, FunctionalState NewState);

/* DMA transfers management functions *****************************************/
void USART_DMACmd(USART_TypeDef* USARTx, uint16_t USART_DMAReq, FunctionalState NewState);

/* Interrupts and flags management functions **********************************/
void USART_ITConfig(USART_TypeDef* USARTx, uint16_t USART_IT, FunctionalState NewState);
FlagStatus USART_GetFlagStatus(USART_TypeDef* USARTx, uint16_t USART_FLAG);
void USART_ClearFlag(USART_TypeDef* USARTx, uint16_t USART_FLAG);
ITStatus USART_GetITStatus(USART_TypeDef* USARTx, uint16_t USART_IT);
void USART_ClearITPendingBit(USART_TypeDef* USARTx, uint16_t USART_IT);

2 配置步骤

使能串口时钟，GPIO时钟使能
串口复位
设置串口端口模式
串口参数初始化使能串口
中断处理

void USART1_IRQHandler(void)                    //串口1中断服务程序
{
    u8 Res;
#if SYSTEM_SUPPORT_OS         //如果SYSTEM_SUPPORT_OS为真，则需要支持OS
    OSIntEnter();    
#endif
    if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)  //接收中断（接收到的数据必须是0x0d 0x0a结尾）
    {
        Res =USART_ReceiveData(USART1);//(USART1->DR);    //读取接收到的数据

        if((USART_RX_STA&0x8000)==0)//接收未完成
        {
            if(USART_RX_STA&0x4000)//接收到ll了0x0d
            {
                if(Res!=0x0a)USART_RX_STA=0;//接收错误，重新开始
                else USART_RX_STA|=0x8000;    //接收完成了
            }
            else //还没有接收到0x0D
            {    
                if(Res==0x0d)USART_RX_STA|=0x4000;
                else
                {
                    USART_RX_BUF[USART_RX_STA&0X3FFF]=Res ;
                    USART_RX_STA++;
                    if(USART_RX_STA>(USART_REC_LEN-1))USART_RX_STA=0;//接收数据错误，重新开始接收
                }        
            }
        }           
  }

主函数处理部分

    while(1)
    {
        if(USART_RX_STA&0x8000)
        {                       
            len=USART_RX_STA&0x3fff;
            printf("\r\nÄ666:\r\n");
            for(t=0;t<len;t++)
            {
                USART_SendData(USART1, USART_RX_BUF[t]);  //向串口1发送数据
                while(USART_GetFlagStatus(USART1,USART_FLAG_TC)!=SET);//等待发送结束
            }
            printf("\r\n\r\n");//插入换行
            USART_RX_STA=0;
        }else
        {
            times++;
            if(times%5000==0)
            {
                printf("\r\n串口实验：\r\n");
                printf("666\r\n\r\n\r\n");
            }
            if(times%200==0)printf("输入数据，以回车结束\r\n");  
            if(times%30==0)LED0=!LED0;//LED闪烁，提示系统正在运行
            delay_ms(10);   
        }
    }

STM32F4开发板----串口（002）

1 相关串口库函数

2 配置步骤

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