STM32的串口采用DMA方式发送数据测试

发送USART_DMACmd(USART1,USART_DMAReq_Tx,ENABLE);//启动串口 USART_Cmd(USART1, ENABLE); //设置IO口时钟 RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE); //串口1的管脚初始化 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //管脚9 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz; //选择GPIO响应速度 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出 GPIO_Init(GPIOA, &GPIO_InitStructure); //TX初始化 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; //管脚10 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz; //选择GPIO响应速度 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //浮空输入 GPIO_Init(GPIOA, &GPIO_InitStructure); //RX初始化 //设置IO口时钟 RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0; //管脚9 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz; //选择GPIO响应速度 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
中断函数：

//串口1DMA方式发送中断void DMA1_Channel4_IRQHandler(void){//清除标志位DMA_ClearFlag(DMA1_FLAG_TC4);//DMA_ClearITPendingBit(DMA1_FLAG_TC4);//DMA1->IFCR |= DMA1_FLAG_TC4;//关闭DMADMA_Cmd(DMA1_Channel4,DISABLE);//DMA1_Channel4->CCR &= ~(1<0);//允许再次发送Flag_Uart_Send = 0;}

发送测试：

//串口DMA发送测试Uart_Send_Buffer[0] = 1;Uart_Send_Buffer[1] = 2;Uart_Send_Buffer[2] = 3;Uart_Send_Buffer[3] = 4;Uart_Send_Buffer[4] = 5;i = 1;while (1){//检查串口是否可以发送while (Flag_Uart_Send);Flag_Uart_Send = 1;//设置传输数据长度DMA_SetCurrDataCounter(DMA1_Channel4,i);//打开DMADMA_Cmd(DMA1_Channel4,ENABLE);i++;if (i > 5){i = 1;}}