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工程师STM32单片机学习基础手记(4):用PWM实现荧火虫灯(六)

时间:05-11 来源:互联网 点击:

  



  DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;

  DMA_InitStructure.DMA_Priority = DMA_Priority_High;

  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;

  以下是stm32f10x_dma.c中有关DMA的初始化设置代码

  tmpreg |= DMA_InitStruct-》DMA_DIR | DMA_InitStruct-》DMA_Mode |

  DMA_InitStruct-》DMA_PeripheralInc | DMA_InitStruct-》DMA_MemoryInc |

  DMA_InitStruct-》DMA_PeripheralDataSize | DMA_InitStruct-》DMA_MemoryDataSize |

  DMA_InitStruct-》DMA_Priority | DMA_InitStruct-》DMA_M2M;

  /* Write to DMAy Channelx CCR */

  DMAy_Channelx-》CCR = tmpreg;

  /*--------------------------- DMAy Channelx CNDTR Configuration ---------------*/

  /* Write to DMAy Channelx CNDTR */

  DMAy_Channelx-》CNDTR = DMA_InitStruct-》DMA_BufferSize;

  


  /*--------------------------- DMAy Channelx CPAR Configuration ----------------*/

  /* Write to DMAy Channelx CPAR */

  DMAy_Channelx-》CPAR = DMA_InitStruct-》DMA_PeripheralBaseAddr;

  

  /*--------------------------- DMAy Channelx CMAR Configuration ----------------*/

  /* Write to DMAy Channelx CMAR */

  DMAy_Channelx-》CMAR = DMA_InitStruct-》DMA_MemoryBaseAddr;

  //内存地址送入CMAR寄存器

  


  说明:这个图从PDF截下来,图中那个DMA_CPARx写错了,应该是DMA_CMARx

  ------------------------------------------------------------------------------------------

  再来看一个DMA的例子

  /* DMA1 Channel5 configuration ----------------------------------------------*/

  DMA_DeInit(DMA1_Channel5);

  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)TIM1_CCR1_Address;

  DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)ADC1_DR_Address;

  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;

  DMA_InitStructure.DMA_BufferSize = 1;

  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;

  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable;

  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;

  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;

  DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;

  DMA_InitStructure.DMA_Priority = DMA_Priority_High;

  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;

  DMA_Init(DMA1_Channel5, DMA_InitStructure);

  /* Enable DMA1 Channel5 */

  DMA_Cmd(DMA1_Channel5, ENABLE);

  还有一些目前暂时还没有去搞清楚的,比如中断处理等,等到需要时再看吧。

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