int main(void) { uint8_t a=0;//LED高低电压控制 /* System Clocks Configuration */ RCC_Configuration(); //系统时钟设置 /*嵌套向量中断控制器 说明了USART1抢占优先级级别0(最多1位) ,和子优先级级别0(最多7位) */ NVIC_Configuration(); //中断源配置 /*对控制LED指示灯的IO口进行了初始化,将端口配置为推挽上拉输出,口线速度为50Mhz。PA9,PA10端口复用为串口1的TX,RX。 在配置某个口线时,首先应对它所在的端口的时钟进行使能。否则无法配置成功,由于用到了端口B, 因此要对这个端口的时钟 进行使能,同时由于用到复用IO口功能用于配置串口。因此还要使能AFIO(复用功能IO)时钟。*/ GPIO_Configuration(); //端口初始化 USART_Config(USART1); //串口1初始化 while (1) { if(rec_f == 1) { //判断是否收到一帧有效数据 rec_f = 0; for(i=0; i
); Delay(0x0000ff0); } /*for(i=0;i); } */ if(a==0) { GPIO_SetBits(GPIOD, GPIO_Pin_2); //LED1 明暗闪烁 a=1; } else { GPIO_ResetBits(GPIOD, GPIO_Pin_2); a=0; } } }}
main函数如上。
相关变量
uint8_t TxBuffer1[] = "USART Interrupt Example: This is USART1 DEMO";uint8_t RxBuffer1[], rec_f, tx_flag, i;__IO uint8_t TxCounter1 = 0x00;__IO uint8_t RxCounter1 = 0x00;uint32_t Rec_Len; 串口中断函数配置如下所示:
//--------------------------------------------------------------------------------------void USART_SendChar(USART_TypeDef* USARTx,uint8_t data) { USART_SendData(USARTx,data); while(USART_GetFlagStatus(USARTx,USART_FLAG_TC)==RESET);}//--------------------------------------------------------------------------------------void USART_Config(USART_TypeDef* USARTx) { USART_InitStructure.USART_BaudRate = 19200; //速率19200bps USART_InitStructure.USART_WordLength = USART_WordLength_8b; //数据位8位 USART_InitStructure.USART_StopBits = USART_StopBits_1; //停止位1位 USART_InitStructure.USART_Parity = USART_Parity_No; //无校验位 USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; //无硬件流控 USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //收发模式 /* Configure USARTx */ USART_Init(USARTx, &USART_InitStructure); //配置串口参数函数 /* Enable USARTx Receive and Transmit interrupts */ USART_ITConfig(USARTx, USART_IT_RXNE, ENABLE); //使能接收中断 USART_ITConfig(USARTx, USART_IT_TXE, ENABLE); //使能发送缓冲空中断 /* Enable the USARTx */ USART_Cmd(USARTx, ENABLE);}//--------------------------------------------------------------------------------------void Delay(__IO uint32_t nCount) { for(; nCount!=0; nCount--);}/*--------------------------------------------------------------------------------------系统时钟配置为72MHZ+外设时钟配置*/void RCC_Configuration(void) { SystemInit(); RCC_APB2PeriphClockCmd( RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOD |RCC_APB2Periph_GPIOA, ENABLE);}//--------------------------------------------------------------------------------------void GPIO_Configuration(void) { GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; //LED1控制--PD2 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //推挽输出 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOD, &GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //USART1 TX GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出 GPIO_Init(GPIOA, &GPIO_InitStructure); //A端口 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; //USART1 RX GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //复用开漏输入 GPIO_Init(GPIOA, &GPIO_InitStructure); //A端口}//--------------------------------------------------------------------------------------void NVIC_Configuration(void) { /* 结构声明*/ NVIC_InitTypeDef NVIC_InitStructure; /* Configure the NVIC Preemption Priority Bits */ /* Configure one bit for preemption priority */ /* 优先级组 说明了抢占优先级所用的位数,和子优先级所用的位数 在这里是1, 7 */ NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0); NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn; //设置串口1中断 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //抢占优先级 0 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //子优先级为0 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //使能 NVIC_Init(&NVIC_InitStructure);} 在中断服务函数中编写usart函数。
//串口1 中断服务程序void USART1_IRQHandler(void) { unsigned int i; //判断读寄存器是否非空 if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET) { //将读寄存器的数据缓存到接收缓冲区里 RxBuffer1[RxCounter1++] = USART_ReceiveData(USART1); //判断结束标志是否是0x0d 0x0a if(RxBuffer1[RxCounter1-2] == 0x0d && RxBuffer1[RxCounter1-1] == 0x0a) { for(i=0; i< RxCounter1; i++) TxBuffer1 = RxBuffer1; //将接收缓冲器的数据转到发送缓冲区,准备转发 //接收成功标志 rec_f = 1; //发送缓冲区结束符 TxBuffer1[RxCounter1] = 0; TxCounter1 = RxCounter1; RxCounter1 = 0; } } //这段是为了避免STM32 USART 第一个字节发不出去的BUG if(USART_GetITStatus(USART1, USART_IT_TXE) != RESET) { //禁止发缓冲器空中断, USART_ITConfig(USART1, USART_IT_TXE, DISABLE); }} 运行结果如下,在发送去不填写任何字符,直接发送,显示RT Interrupt Example: This is USART1 DEMO,说明前三个字符已经被占用替换了。
试验平台alienteck mini stm32V1.9 stm32f103rbt6
int main(void) { uint8_t a=0;//LED高低电压控制 /* System Clocks Configuration */ RCC_Configuration(); //系统时钟设置 /*嵌套向量中断控制器 说明了USART1抢占优先级级别0(最多1位) ,和子优先级级别0(最多7位) */ NVIC_Configuration(); //中断源配置 /*对控制LED指示灯的IO口进行了初始化,将端口配置为推挽上拉输出,口线速度为50Mhz。PA9,PA10端口复用为串口1的TX,RX。 在配置某个口线时,首先应对它所在的端口的时钟进行使能。否则无法配置成功,由于用到了端口B, 因此要对这个端口的时钟 进行使能,同时由于用到复用IO口功能用于配置串口。因此还要使能AFIO(复用功能IO)时钟。*/ GPIO_Configuration(); //端口初始化 USART_Config(USART1); //串口1初始化 while (1) { if(rec_f == 1) { //判断是否收到一帧有效数据 rec_f = 0; for(i=0; i
); Delay(0x0000ff0); } /*for(i=0;i); } */ if(a==0) { GPIO_SetBits(GPIOD, GPIO_Pin_2); //LED1 明暗闪烁 a=1; } else { GPIO_ResetBits(GPIOD, GPIO_Pin_2); a=0; } } }}
main函数如上。
相关变量
uint8_t TxBuffer1[] = "USART Interrupt Example: This is USART1 DEMO";uint8_t RxBuffer1[], rec_f, tx_flag, i;__IO uint8_t TxCounter1 = 0x00;__IO uint8_t RxCounter1 = 0x00;uint32_t Rec_Len; 串口中断函数配置如下所示:
//--------------------------------------------------------------------------------------void USART_SendChar(USART_TypeDef* USARTx,uint8_t data) { USART_SendData(USARTx,data); while(USART_GetFlagStatus(USARTx,USART_FLAG_TC)==RESET);}//--------------------------------------------------------------------------------------void USART_Config(USART_TypeDef* USARTx) { USART_InitStructure.USART_BaudRate = 19200; //速率19200bps USART_InitStructure.USART_WordLength = USART_WordLength_8b; //数据位8位 USART_InitStructure.USART_StopBits = USART_StopBits_1; //停止位1位 USART_InitStructure.USART_Parity = USART_Parity_No; //无校验位 USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; //无硬件流控 USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //收发模式 /* Configure USARTx */ USART_Init(USARTx, &USART_InitStructure); //配置串口参数函数 /* Enable USARTx Receive and Transmit interrupts */ USART_ITConfig(USARTx, USART_IT_RXNE, ENABLE); //使能接收中断 USART_ITConfig(USARTx, USART_IT_TXE, ENABLE); //使能发送缓冲空中断 /* Enable the USARTx */ USART_Cmd(USARTx, ENABLE);}//--------------------------------------------------------------------------------------void Delay(__IO uint32_t nCount) { for(; nCount!=0; nCount--);}/*--------------------------------------------------------------------------------------系统时钟配置为72MHZ+外设时钟配置*/void RCC_Configuration(void) { SystemInit(); RCC_APB2PeriphClockCmd( RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOD |RCC_APB2Periph_GPIOA, ENABLE);}//--------------------------------------------------------------------------------------void GPIO_Configuration(void) { GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; //LED1控制--PD2 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //推挽输出 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOD, &GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //USART1 TX GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出 GPIO_Init(GPIOA, &GPIO_InitStructure); //A端口 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; //USART1 RX GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //复用开漏输入 GPIO_Init(GPIOA, &GPIO_InitStructure); //A端口}//--------------------------------------------------------------------------------------void NVIC_Configuration(void) { /* 结构声明*/ NVIC_InitTypeDef NVIC_InitStructure; /* Configure the NVIC Preemption Priority Bits */ /* Configure one bit for preemption priority */ /* 优先级组 说明了抢占优先级所用的位数,和子优先级所用的位数 在这里是1, 7 */ NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0); NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn; //设置串口1中断 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //抢占优先级 0 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //子优先级为0 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //使能 NVIC_Init(&NVIC_InitStructure);} 在中断服务函数中编写usart函数。
//串口1 中断服务程序void USART1_IRQHandler(void) { unsigned int i; //判断读寄存器是否非空 if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET) { //将读寄存器的数据缓存到接收缓冲区里 RxBuffer1[RxCounter1++] = USART_ReceiveData(USART1); //判断结束标志是否是0x0d 0x0a if(RxBuffer1[RxCounter1-2] == 0x0d && RxBuffer1[RxCounter1-1] == 0x0a) { for(i=0; i< RxCounter1; i++) TxBuffer1 = RxBuffer1; //将接收缓冲器的数据转到发送缓冲区,准备转发 //接收成功标志 rec_f = 1; //发送缓冲区结束符 TxBuffer1[RxCounter1] = 0; TxCounter1 = RxCounter1; RxCounter1 = 0; } } //这段是为了避免STM32 USART 第一个字节发不出去的BUG if(USART_GetITStatus(USART1, USART_IT_TXE) != RESET) { //禁止发缓冲器空中断, USART_ITConfig(USART1, USART_IT_TXE, DISABLE); }} 运行结果如下,在发送去不填写任何字符,直接发送,显示RT Interrupt Example: This is USART1 DEMO,说明前三个字符已经被占用替换了。
试验平台alienteck mini stm32V1.9 stm32f103rbt6
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