typedef struct {
uint32_t USART_BaudRate;
uint16_t USART_WordLength;
uint16_t USART_StopBits;
uint16_t USART_Parity;
uint16_t USART_Mode;
uint16_t USART_HardwareFlowControl;
} USART_InitTypeDef;

// 串口中断服务函数
void USART1_IRQHandler(void)
{uint8_t ucTemp;if(USART_GetITStatus(USART1,USART_IT_RXNE)!=RESET){    ucTemp = USART_ReceiveData(USART1);}
}

//发送一个字节
void Usart_SendByte(USART_TypeDef * pUSARTx, uint8_t ch)
{//发送一个字节数据到USARTUSART_SendData(pUSARTx,ch);//等待发送数据寄存器为空，即发送完成while (USART_GetFlagStatus(pUSARTx, USART_FLAG_TXE) == RESET);
}
//发送一个数组
void Usart_SendArray(USART_TypeDef * pUSARTx, uint8_t *array, uint16_t num)
//发送字符串
void Usart_SendString(USART_TypeDef * pUSARTx, char *str)

void NVIC_Configuration(void)
{NVIC_InitTypeDef NVIC_InitStructure;/* 嵌套向量中断控制器组选择 */NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);/* 配置USART为中断源 */NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;/* 抢断优先级*/NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;/* 子优先级 */NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;/* 使能中断 */NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;/* 初始化配置NVIC */NVIC_Init(&NVIC_InitStructure);
}void USART_Config(uint32_t baudrate)
{GPIO_InitTypeDef GPIO_InitStructure;USART_InitTypeDef USART_InitStructure;// 打开串口GPIO的时钟RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);// 打开串口外设的时钟RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);// 将USART Tx的GPIO配置为推挽复用模式GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(GPIOA, &GPIO_InitStructure);// 将USART Rx的GPIO配置为浮空输入模式GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;GPIO_Init(GPIOA, &GPIO_InitStructure);// 配置串口的工作参数// 配置波特率USART_InitStructure.USART_BaudRate = baudrate;// 配置 帧数据字长USART_InitStructure.USART_WordLength = USART_WordLength_8b;// 配置停止位USART_InitStructure.USART_StopBits = USART_StopBits_1;// 配置校验位USART_InitStructure.USART_Parity = USART_Parity_No ;// 配置硬件流控制USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;// 配置工作模式，收发一起USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;// 完成串口的初始化配置USART_Init(USART1, &USART_InitStructure);// 串口中断优先级配置NVIC_Configuration();// 使能串口接收中断USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);// 使能串口USART_Cmd(USART1, ENABLE);
}//发送一个字节
void Usart_SendByte(USART_TypeDef * pUSARTx, uint8_t ch)
{//发送一个字节数据到USARTUSART_SendData(pUSARTx,ch);//等待发送数据寄存器为空，即发送完成while (USART_GetFlagStatus(pUSARTx, USART_FLAG_TXE) == RESET);
}//发送数组
void Usart_SendArray(USART_TypeDef * pUSARTx, uint8_t *array, uint16_t num)
{uint8_t i;for(i = 0; i < num; i++){/* 发送一个字节数据到USART */Usart_SendByte(pUSARTx, array[i]);}/* 等待发送完成 */while(USART_GetFlagStatus(pUSARTx, USART_FLAG_TC)==RESET);
}//发送字符串
void Usart_SendString(USART_TypeDef * pUSARTx, char *str)
{uint32_t k = 0;do{Usart_SendByte(pUSARTx, *(str + k));k++;} while(*(str + k)!='0');/* 等待发送完成 */while(USART_GetFlagStatus(pUSARTx,USART_FLAG_TC)==RESET);
}//发送16位数
void Usart_SendHalfWord(USART_TypeDef * pUSARTx, uint16_t ch)
{uint8_t temp_h, temp_l;/* 取出高八位 */temp_h = (ch & 0xFF00) >> 8;/* 取出低八位 */temp_l = ch & 0xFF;/* 发送高八位 */USART_SendData(pUSARTx, temp_h);while (USART_GetFlagStatus(pUSARTx, USART_FLAG_TXE) == RESET);/* 发送低八位 */USART_SendData(pUSARTx, temp_l);while (USART_GetFlagStatus(pUSARTx, USART_FLAG_TXE) == RESET);
}// 串口中断服务函数
void USART1_IRQHandler(void)
{uint8_t ucTemp;if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET){ucTemp = USART_ReceiveData(USART1);USART_SendData(USART1, ucTemp);}
}int main(void)
{USART_Config(9600);Usart_SendString(USART1, "Hello World!n");while(1){}
}