分别配置的代码如下: staticvoidUSART1_Tx_DMA_Config(void){ DMA_InitTypeDef DMA_InitStructure; NVIC_InitTypeDef NVIC_InitStructure; NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel4_IRQn;// 配置DMA1_Channel4中断NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority =1; NVIC_InitStructure.NVIC_IRQChannelSubP...
DMA_InitStructure.DMA_BufferSize = CKS_UART_TX_RX_BUFF; DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryData...
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte; DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh; DMA_Ini...
DMA TX request */USART_DMACmd(LUMMOD_UART, USART_DMAReq_Tx, ENABLE); // 开启串口DMA发送...
USART_DMAReq：指定DMA请求。USART_DMAReq_Tx:USART DMA发送请求。USART_DMAReq_Rx:USART DMA接收请求...
我们知道使用串口发送数据是比较占用CPU时间的,STM32支持DMA方式发送和接收串口数据,以解放CPU,提高串口的效率,而USART的DMA模式发送和接收信息的使能位是在CR3中。 USART的库函数应用 配置步骤 将涉及到的模块时钟使能(USARTn和GPIO) USART1和GPIO都在APB2(PCLK2)时钟下,USART2~5都在APB1(PCLK1)时钟下。
其次，也要设置USART使其支持DMA方式：复制 USARTx->CR3 |= USART_DMAReq_Tx;
{ uint16_t i; USART_Config(); //初始化USART1 DMA_Config(); //初始化DMA for(i=0;i<SENDBUFF_SIZE;i++) //初始化DMA传输数据源存储区 { Send_Buff [i] = 'Z'; } /*使能USART1的DMA发送,启动DMA数据传输*/ USART_DMACmd(USART1, USART_DMAReq_Tx,ENABLE); //关键 while(1); //无...
NVIC_InitStructure.NVIC_IRQChannel = LUMMOD_UART_Tx_DMA_IRQ; // 发送DMA通道的中断配置 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; // 优先级设置 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; ...
指向buffer1DMA_DoubleBufferModeCmd(DMAx_Streamx,ENABLE);//双缓冲模式开启DMA_ITConfig(DMAx_Streamx,DMA_IT_TC,ENABLE);//开启传输完成中断USART_DMACmd(DEBUG_USART,USART_DMAReq_Tx,ENABLE);//开启串口对DMA发送请求DMA_Cmd(DMAx_Streamx,DISABLE);//为了验证,DMA到底是先从哪个缓冲区拿数据,先不着急开启...