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标题: STM32 DMA_GetCurrDataCounter()函数值不变！ [打印本页]

作者: 辰晨 时间: 2012-7-22 15:12
标题: STM32 DMA_GetCurrDataCounter()函数值不变！
最近尝试用USART2的DMA模式来发送接收数据。接收的时候，发现DMA_GetCurrDataCounter()的值维持DMA_BufferSize的大小不变。若用while(DMA_GetFlagStatus(DMA1_FLAG_TC6)==RESET);则一直循环着。

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOD|RCC_APB2Periph_USART1,ENABLE);
  //启动DMA时钟
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);

void USART2_Configuration(void)
{
  USART_InitTypeDef USART_InitStructure;
  USART_InitStructure.USART_BaudRate = 115200;
  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_Tx | USART_Mode_Rx;
  USART_Init(USART2, &USART_InitStructure);
  USART_Cmd(USART2, ENABLE);
  USART_DMACmd(USART2,USART_DMAReq_Tx,ENABLE);
  USART_DMACmd(USART2,USART_DMAReq_Rx,ENABLE);
}
//接收部分
  DMA_DeInit(DMA1_Channel6);
  DMA_InitStructure.DMA_PeripheralBaseAddr = USART2_DR_Base;
  DMA_InitStructure.DMA_MemoryBaseAddr = (u32)SensorsData;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
  DMA_InitStructure.DMA_BufferSize = Counts;
  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_Normal;//正常或者循环。
  DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;
  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
  DMA_Init(DMA1_Channel6, &DMA_InitStructure);
  DMA_Cmd(DMA1_Channel6,ENABLE);
//发送正常

作者: ccw163165 时间: 2012-7-27 19:35
楼主DMA_GetCurrDataCounter()这个在哪里？？？

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