STM32F103 UART3使用DMA空闲检测接收不定长数据使用困惑

Jurry · 发表于 2018-1-13 21:44:31

本帖最后由 Jurry 于 2018-1-13 22:27 编辑

先上代码：

VOID Usart3Init(UINT32 udBound)
{
            GPIO_InitTypeDef GPIO_InitStructure;
            USART_InitTypeDef USART_InitStructure;
            NVIC_InitTypeDef NVIC_InitStructure;
            DMA_InitTypeDef DMA_InitStructure;

            RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
            //RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB|RCC_APB2Periph_AFIO, ENABLE);
            RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
            RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
            /* UART3 Port remap */
            //GPIO_PinRemapConfig(GPIO_FullRemap_USART3,ENABLE);

            /* USART3_TX, GPIOB.10 */
            GPIO_InitStructure.GPIO_Pin = PinUsartTx3;
            GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
            GPIO_Init(PortUSART3, &GPIO_InitStructure);

            /* USART3_RX, GPIOB.11 */
            GPIO_InitStructure.GPIO_Pin = PinUsartRx3;
            GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
            GPIO_Init(PortUSART3, &GPIO_InitStructure);

            USART_InitStructure.USART_BaudRate = udBound;
            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(USART3, &USART_InitStructure);

            USART_ITConfig(USART3, USART_IT_IDLE, ENABLE);
            USART_Cmd(USART3, ENABLE);
            USART_ClearFlag(USART3, USART_FLAG_TC);

            DMA_DeInit(DMA1_Channel7);
            DMA_InitStructure.DMA_PeripheralBaseAddr = (UINT32)(&USART3->DR);
            DMA_InitStructure.DMA_MemoryBaseAddr = (UINT32)pcRcvUART3->Data_RX_BUF;
            DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
            DMA_InitStructure.DMA_BufferSize = lenUsartRcv;
            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_MemoryDataSize_Byte;
            DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
            DMA_InitStructure.DMA_Priority = DMA_Priority_Low;
            DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
            DMA_Init(DMA1_Channel7,&DMA_InitStructure);
            /* DMA_IT_TC  DMA_IT_TE */
            DMA_ITConfig(DMA1_Channel7, DMA_IT_TC, ENABLE);
            DMA_ITConfig(DMA1_Channel7, DMA_IT_TE, ENABLE);
            USART_DMACmd(USART3,USART_DMAReq_Rx,ENABLE);
            DMA_Cmd(DMA1_Channel7,ENABLE);

            /* USART3-NVICÅäÖÃ￡¬ÇàÕ¼óÅÏè¼¶2￡¬×óóÅÏè¼¶3 */
            NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
            NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
            NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
            NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
            NVIC_Init(&NVIC_InitStructure);

            /* DMA-NVICÅäÖÃ￡¬ÇàÕ¼óÅÏè¼¶2￡¬×óóÅÏè¼¶2  */
//             NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel7_IRQn;
//             NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
//             NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
//             NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
//             NVIC_Init(&NVIC_InitStructure);

}

void USART3_IRQHandler( void )
{
      UINT16 udDataTmp;

            if(RESET != USART_GetITStatus(USART3,USART_IT_IDLE))
            {
                              udDataTmp = USART3->SR;
                              udDataTmp = USART3->DR;
                              DMA_Cmd(DMA1_Channel7,DISABLE);
                        pcRcvUART3->InfBit.FramLength = lenUsartRcv - DMA_GetCurrDataCounter(DMA1_Channel7);
                              printf("UART3 Receive Data length is: %d\r\n",pcRcvUART3->InfBit.FramLength);

                              USART_ClearITPendingBit(USART3,USART_IT_IDLE);
                              DMA_SetCurrDataCounter(DMA1_Channel7,lenUsartRcv);
                              DMA_Cmd(DMA1_Channel7,ENABLE);

                              /* UART3 receive done! UART1_FSM start */
                              pcRcvUART3->InfBit.FramFinishFlag = 1;

                        //TcpClosedFlag = strstr ( pcRcvUART3->Data_RX_BUF, "CLOSED\r\n" ) ? 1 : 0;
            }

}

VOID DMA1_Channel7_IRQHandler(VOID)
{
            DMA_Cmd(DMA1_Channel7,DISABLE);
            pcRcvUART3->InfBit.FramLength = lenUsartRcv - DMA_GetCurrDataCounter(DMA1_Channel7);
            printf("UART3-1 Receive Data length is: %d\r\n",pcRcvUART3->InfBit.FramLength);

            DMA_ClearITPendingBit(DMA1_IT_TC7);
            DMA_ClearITPendingBit(DMA1_IT_TE7);

         DMA1_Channel7->CNDTR = lenUsartRcv;
         DMA_Cmd(DMA1_Channel7, ENABLE);
}

/*****************************************************************************************************************
********************************************分割线****************************************************************
*****************************************************************************************************************/
状况描述：             UART1  UART2使用同样的代码结构可以进行正常收发
   但对于UART3, 发送没有啥问题，可以正常发送数据
   但是接收出现了问题，进入接收中断时：
   pcRcvUART3->InfBit.FramLength = lenUsartRcv - DMA_GetCurrDataCounter(DMA1_Channel7);
   DMA_GetCurrDataCounter(DMA1_Channel7)值一直不变，大小为lenUsartRcv
这种情况一般是DMA没有进行数据搬运吧，但是DMA配置检查了好多遍也感觉没啥问题
UART3的两个GPIO口，GPIOB_10  GPIOB_11
与IIC是复用的，但是我实际中并没有使用IIC
困扰了一天，还是没有解决
恳请哪位高人指点，谢谢啦