探索者 DMA 存储器到存储器设置

[复制链接]

254|0

手机看帖

扫描二维码
随时随地手机跟帖

电梯直达

楼主

丑帅丑帅的|

楼主 | 2018-7-29 17:10 | 只看该作者回帖奖励

|倒序浏览 |阅读模式

DMA, 存储器, ST, ni, struct

小弟拿例程来改，稀里糊涂改出来了。鉴于网上M2M的例子不多，俺就分享一个，抛砖引玉，高人莫笑，有修改意见就更妙了。
      ss1[0]='1';
      ss1[1]='2';
      ss1[2]='3';
      ss1[3]='4';
      ss1[4]=0x00;
      ss2[0]='a';
      ss2[1]='b';
      ss2[2]='c';
      ss2[3]='d';
      ss2[4]=0x00;
                     MYDMA_Config(DMA2_Stream1,DMA_Channel_0,(u32)&ss2,(u32)ss1+1,1);/////ss2 到 ss1
                        MYDMA_Enable(DMA2_Stream1,2);
                        //delay_ms(100);
                  while(1)
                  {
                              if(DMA_GetFlagStatus(DMA2_Stream1,DMA_FLAG_TCIF1)!=RESET)//
                              {
                                    DMA_ClearFlag(DMA2_Stream1,DMA_FLAG_TCIF1);//
                                    break;
                     }
                  }
      LCD_ShowString(60,600,200,16,16,ss1);
      LCD_ShowString(60,700,200,16,16,ss2);

void MYDMA_Config(DMA_Stream_TypeDef *DMA_Streamx,u32 chx,u32 par,u32 mar,u16 ndtr)
{
      DMA_InitTypeDef  DMA_InitStructure;
      if((u32)DMA_Streamx>(u32)DMA2)//
      {
      RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2,ENABLE);//
      }else
      {
      RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1,ENABLE);//
      }
  DMA_DeInit(DMA_Streamx);
      while (DMA_GetCmdStatus(DMA_Streamx) != DISABLE){}//
  DMA_InitStructure.DMA_Channel = chx;
  DMA_InitStructure.DMA_PeripheralBaseAddr = par;//
  DMA_InitStructure.DMA_Memory0BaseAddr = mar;//
  DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToMemory;//
  DMA_InitStructure.DMA_BufferSize = ndtr;//
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Enable;//
  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_Medium;//
  DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
  DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
  DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;//
  DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;//
  DMA_Init(DMA_Streamx, &DMA_InitStructure);//
}

注释见例程。

使用特权

评论回复赏

探索者 DMA 存储器到存储器设置

相关下载

相关帖子