本帖最后由 suebillt 于 2015-11-19 17:36 编辑
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debug看到USART->DR里面是有数据的,IDLE中断也能进去,但是貌似DMA不工作
[size=1em][size=1em]DMA_GetCurrDataCounter(DMA2_Stream2);一直是0</pre>
[size=1em]串口配置如下
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[size=1em]- void UART1_Config(u32 bound)
- {
- RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE); //开GPIOA时钟
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);//开USART1时钟
- //串口1对应引脚复用映射
- GPIO_PinAFConfig(GPIOA,GPIO_PinSource9,GPIO_AF_USART1); //GPIOA9¸复用为USART1
- GPIO_PinAFConfig(GPIOA,GPIO_PinSource10,GPIO_AF_USART1); //GPIOA10
-
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10; //GPIOA9与GPIOA10
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;//复用功能
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //IO速度50M
- GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //推免复用输出
- GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; //上拉
- GPIO_Init(GPIOA,&GPIO_InitStructure); //初始化IO
- //USART1 初始化
- USART_InitStructure.USART_BaudRate = bound;//波特率设置
- USART_InitStructure.USART_WordLength = USART_WordLength_8b;//8bit
- USART_InitStructure.USART_StopBits = USART_StopBits_1;//停止位
- USART_InitStructure.USART_Parity = USART_Parity_No;//无奇偶校验
- USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件流控制
- USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //打开发送和接收
- USART_Init(USART1, &USART_InitStructure); //初始化串口1
-
- USART_Cmd(USART1, ENABLE); //开启串口1
- USART_DMACmd(USART1, USART_DMAReq_Rx, ENABLE);
-
- //USART_ClearFlag(USART1, USART_FLAG_TC);
- //中断设置
- USART_ITConfig(USART1, USART_IT_IDLE, ENABLE);//空闲中断
- NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;//串口1中断通道
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;//抢占优先级3
- NVIC_InitStructure.NVIC_IRQChannelSubPriority =0; //子优先级3
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能
- NVIC_Init(&NVIC_InitStructure); //初始化
- //DMA使能
- RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_DMA2, ENABLE); //Ǵ֯DMAʱד
- DMA_DeInit(DMA2_Stream2); //DeInit
-
- DMA_InitStructure.DMA_Channel = DMA_Channel_4; //通道选择
- DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)(&(USART1->DR));//源地址
- DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)Uart_Rx1; //目的地址
- DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory; //外设到内存
- DMA_InitStructure.DMA_BufferSize = UART1_RX_LEN; //数据传输量
- DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//外设非增量模式
- DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //内存增量模式
- DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;//数据长度8bit
- DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte; //存储器数据长度8bit
- DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; //普通模式
- DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh; // 优先级高
- DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Enable;
- DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
- DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;//存储器突发单次传输
- DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;//外设突发单次传输
- DMA_Init(DMA2_Stream2, &DMA_InitStructure);//初始化
- DMA_Cmd(DMA2_Stream2,ENABLE); //使能
- }
复制代码
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RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_DMA2, ENABLE); //Ǵ֯DMAʱד
谢谢,看的真仔细,F4与F1有不同之处就是下面一句不能重装填了,还有啥好办法
可以重载啊,一样的先disabled然后重载再enable。
我这么写的,只能传输一次
好吧,循环模式可以
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
能用就行。
谢谢你的耐心解答