首先，我们需要配置uart的GPIO口。这一步是确保UART能够正常工作的基础。我们可以通过以下代码来完成：
```c void UART1_GPIO_Configuration(void) { GPIO_InitTypeDef GPIO_InitStructure; // 将USART1的发送端配置为复用推挽输出 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_Init(GPIOA, &GPIO_InitStructure);
// 将USART1的接收端配置为浮空输入 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_Init(GPIOA, &GPIO_InitStructure); } ```
接下来，是串口参数的配置。这一步决定了串口的工作方式和通信参数。以下代码展示了如何设置串口的波特率、数据位、停止位等参数：
```c void USART_Configuration(void) { USART_InitTypeDef USART_InitStructure; USART_ClockInitTypeDef USART_ClockInitStructure;
Uart1_GPIO_Configuration(); // 同步参数配置 USART_ClockInitStructure.USART_Clock = USART_Clock_Disable; USART_ClockInitStructure.USART_CPOL = USART_CPOL_Low; USART_ClockInitStructure.USART_CPHA = USART_CPHA_2Edge; USART_ClockInitStructure.USART_LastBit = USART_LastBit_Disable; USART_ClockInit(USART1, &USART_ClockInitStructure);
// 基本参数配置 USART_InitStructure.USART_BaudRate = 9600; 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(USART1, &USART_InitStructure);
// 启用接收中断 USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); // 启用串口 USART_Cmd(USART1, ENABLE); } ```
为了使串口中断能够正常工作，还需要对中断控制器NVIC进行配置，并修改串口中断处理函数。以下是配置NVIC的示例代码：
```c void NVIC_Configuration(void) { NVIC_InitTypeDef NVIC_InitStructure;
#ifdef VECT_TAB_RAM NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0); #else NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0); #endif
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0); NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQChannel; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); } ```
在串口中断处理函数中，我们需要根据不同的情况处理接收到的数据或者发送数据：
```c void USART1_IRQHandler(void) { // 处理接收到的数据 if(USART_GetITStatus(USART1, USART_IT_RXNE) != reset) { USART_ClearITPendingBit(USART1, USART_IT_RXNE); }
// 发送中断 if (USART_GetITStatus(USART1, USART_IT_TXE) != RESET) { USART_SendData(USART1, Send_Data[Send_Length++]); if (Send_Length == SEND_LENGTH) { USART_ClearITPendingBit(USART1,USART_IT_TXE); USART_ITConfig(USART1, USART_IT_TXE, DISABLE); USART_ITConfig(USART1, USART_IT_TC, ENABLE); } }
// 发送完成 if (USART_GetITStatus(USART1, USART_IT_TC) != RESET) { USART_ClearITPendingBit(USART1,USART_IT_TC); USART_ITConfig(USART1, USART_IT_TC, DISABLE); } } ```
最后，在需要发送数据的地方，只需设置好数据数组`Send_Data`和发送长度，然后调用以下函数即可启动发送：
```c void Send_to_PC(void) { USART_ITConfig(USART1, USART_IT_TXE, ENABLE); } ```
通过以上步骤，STM32的串口就可以顺利地工作起来，实现数据的接收和发送。在实际应用中，根据具体的通信需求，可能还需要对代码进行适当的调整和优化。
STM32的串口中断配置,也是很简单的.
首先是配置UART的GPIO口
首先是配置UART的GPIO口
/**********************************************
* Name : UART1_GPIO_Configuration
* Deion : Configures the uart1 GPIO ports.
* Input : None
* Output : None
* Return : None
**********************************************************/
void UART1_GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
// Configure USART1_Tx as alterNATe push-pull
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
// Configure USART1_Rx as input floating
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}
然后是配置串口参数
/*******************************************************
* Name : UART1_Configuration
* Deion : Configures the uart1
* Input : None
* Output : None
* Return : None
*********************************************/
void USART_Configuration(void)
{
USART_InitTypeDef USART_InitStructure;
USART_ClockInitTypeDef USART_ClockInitStructure;
Uart1_GPIO_Configuration();
USART_ClockInitStructure.USART_Clock = USART_Clock_Disable;
USART_ClockInitStructure.USART_CPOL = USART_CPOL_Low;
USART_ClockInitStructure.USART_CPHA = USART_CPHA_2Edge;
USART_ClockInitStructure.USART_LastBit = USART_LastBit_Disable;
/* Configure the USART1 synchronous paramters */
USART_ClockInit(USART1, &USART_ClockInitStructure);
USART_InitStructure.USART_BaudRate = 9600;
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;
/* Configure USART1 bASIC and asynchronous paramters */
USART_Init(USART1, &USART_InitStructure);
/* Enable USART1 Receive interrupts */
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
/* Enable USART1 */
USART_Cmd(USART1, ENABLE);
}
然后是在中断设置,需要修改stm32f10x_it.c 中的串口中断函数 并且需要修改void NVIC_Configuration(void)函数
修改NVIC_Configuration函数
/***********************************************************
* Name : NVIC_Configuration
* Deion : Configures NVIC and Vector Table base location.
* Input : None
* Output : None
* Return : None
***************************************************/
void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
#ifdef VECT_TAB_RAM
/* Set the Vector Table base location at 0x20000000 */
NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
#else /* VECT_TAB_FLASH */
/* Set the Vector Table base location at 0x08000000 */
NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
#endif
/* Configure the NVIC Preemption Priority Bits */
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
/* Enable the USART1 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQChannel;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
//串口中断
void USART1_IRQHandler(void)
{
//处理接收到的数据
if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
{
/* Clear the USART1 Receive interrupt */
USART_ClearITPendingBit(USART1, USART_IT_RXNE);
}
//发送中断
if (USART_GetITStatus(USART1, USART_IT_TXE) != RESET)
{
USART_SendData(USART1, Send_Data[Send_Length++]);
if (Send_Length==SEND_LENGTH)
{
//发送字节结束
USART_ClearITPendingBit(USART1,USART_IT_TXE);
USART_ITConfig(USART1, USART_IT_TXE, DISABLE);
USART_ITConfig(USART1, USART_IT_TC, ENABLE);
}
}
//发送完成
if (USART_GetITStatus(USART1, USART_IT_TC) != RESET)
{
USART_ClearITPendingBit(USART1,USART_IT_TC);
USART_ITConfig(USART1, USART_IT_TC, DISABLE);
}
}
在需要发送的程序里Send_Data[SEND_LENGTH]和发送长度设置好,
void Send_to_PC(void)
{
//设置好Send_Data[SEND_LENGTH]数组
//打开发送中断
USART_ITConfig(USART1, USART_IT_TXE, ENABLE);
}
至此 串口就可以工作起来了！~
