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求教！在写STM32F405 DMA+空闲中断接收，用的是USART3，看了网上很多分享的帖子了，但是都不行，出现的现象是：
1）我设置的BufferSize是16，必须要满足16个数后，才能触发我的空闲中断，且继续发送数据，偶尔会触发中断，但是接收DMA可正常工作，但是DMA_GetCurrDataCounter(DMA1_Stream1)与实际发送数据不符！
2）调整配置顺序，如先使能DMA，再配置USART，每次可以进中断，但是DMA不接收数据，接收寄存器一直为0，DR寄存器里显示是我发的一帧数据的第一个；
我的源程序如下，请帮我找找原因，我已经调了很多天了，但是这个一直困扰我！谢谢谢谢谢谢！
void USART3_Configuration(void) // 串口配置函数
{
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
USART_InitTypeDef USART_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC,ENABLE); //使能GPIOC时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE);//使能USART3时钟，挂在APB1上
GPIO_PinAFConfig(GPIOC,GPIO_PinSource10,GPIO_AF_USART3); //GPIOC10复用USART3_TX
GPIO_PinAFConfig(GPIOC,GPIO_PinSource11,GPIO_AF_USART3); //GPIOC11复用USART3_RX
//发送TXPIN
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);
//接收RXPIN
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; //上拉
GPIO_Init(GPIOC, &GPIO_InitStructure);
USART_InitStructure.USART_BaudRate = 115200;//波特率设置
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字长为8位数据格式
USART_InitStructure.USART_StopBits = USART_StopBits_1;//1个停止位
USART_InitStructure.USART_Parity = USART_Parity_No;//无奇偶校验位
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件数据流控制
USART_InitStructure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx; //收发模式
USART_Init(USART3, &USART_InitStructure); //初始化串口3
USART_ITConfig(USART3, USART_IT_IDLE, ENABLE);
USART_DMACmd(USART3, USART_DMAReq_Rx, ENABLE);
NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn; //串口3中断通道
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3;//抢占优先级2
NVIC_InitStructure.NVIC_IRQChannelSubPriority =3; //子优先级0
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能
NVIC_Init(&NVIC_InitStructure); //根据指定的参数初始化VIC寄存器
USART_Cmd(USART3, ENABLE); //使能串口3
}
void DMA_Usart_Init()
{
DMA_InitTypeDef DMA_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE); // 开启DMA1时钟
DMA_InitStructure.DMA_Channel = DMA_Channel_4; //外设的接收通道
DMA_InitStructure.DMA_PeripheralBaseAddr = (int32_t)&USART3->DR; //source buf
DMA_InitStructure.DMA_Memory0BaseAddr = (int32_t)&USART3_R_BUF; //target buf
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory; //外设寄存器 -> 内存缓冲区?
DMA_InitStructure.DMA_BufferSize = 18; //BuffSize;
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_Mode_Circular; //DMA_Mode_Normal; //接收设计为循环收，否则接收一次后，无法正常接收到数据
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull; //指定FIFO阈值水平
// DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;// DMA_MemoryBurst_Single; //指定Burst转移配置内存传输，单次传输
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single; // 指定的burst转移配置外围转移
DMA_Init(DMA1_Stream1, &DMA_InitStructure);
DMA_Cmd(DMA1_Stream1, ENABLE);
}
void USART3_IRQHandler(void)
{
uint32_t temp = 0;
uint16_t i = 0;
unsigned char r = 0;
if((USART_GetFlagStatus(USART3,USART_IT_IDLE)) != RESET)
{
DMA_Cmd(DMA1_Stream1, DISABLE);
temp = USART3->SR;
temp = USART3->DR;
i = 16 - DMA_GetCurrDataCounter(DMA1_Stream1);
DMA_ClearFlag(DMA1_Stream1,DMA_FLAG_TCIF1 | DMA_FLAG_FEIF1 | DMA_FLAG_DMEIF1 | DMA_FLAG_TEIF1 | DMA_FLAG_HTIF1);//清除DMA1_Steam1传输完成标志
DMA_SetCurrDataCounter(DMA1_Stream1, 16);
receive_flag = 1; //????????1DMA_Cmd(DMA1_Stream1, ENABLE);
}
}
配置程序和中断服务函数如上，请大家帮我看看！或者大家一起讨论一下呀！我真的已经试了很多很多种方案！
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发表于 2016-11-8 19:44:01
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