STM32 DMA学习
发布时间：2020-12-15 06:15:49 所属栏目：百科 来源：网络整理
导读：一个简单的例子 transfer? a word data buffer from FLASH memory to embedded SRAM memory. 在V3.1.2库的位置 STM32F10x_StdPeriph_Lib_V3.1.2ProjectSTM32F10x_StdPeriph_ExamplesDMAFLASH_RAM /* DMA1 channel6 configuration */ DMA_DeInit(DMA1_Cha
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一个简单的例子 transfer? a word data buffer from FLASH memory to embedded SRAM memory.
在V3.1.2库的位置 STM32F10x_StdPeriph_Lib_V3.1.2ProjectSTM32F10x_StdPeriph_ExamplesDMAFLASH_RAM /* DMA1 channel6 configuration */ DMA_DeInit(DMA1_Channel6); ? //peripheral base address DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)SRC_Const_Buffer; ? //memory base address?? DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)DST_Buffer; ? //数据传输方向??? Peripheral is source ?? ? ??? ??? ?? DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; //缓冲区大小 Number of data to be transferred (0 up to 65535).数据传输数目? ?? ? DMA_InitStructure.DMA_BufferSize = BufferSize; ?? // the Peripheral address register is incremented? ?? ??? DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Enable; ? //the memory address register is incremented DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //the Peripheral data width? ?? ??? DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word; DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word; DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; DMA_InitStructure.DMA_Priority = DMA_Priority_High; //the DMAy Channelx will be used in memory-to-memory transfer //DMA通道的操作可以在没有外设请求的情况下进行，这种操作就是存储器到存储器模式。 DMA_InitStructure.DMA_M2M = DMA_M2M_Enable;?? DMA_Init(DMA1_Channel6,&DMA_InitStructure); /* Enable DMA1 Channel6 Transfer Complete interrupt */ DMA_ITConfig(DMA1_Channel6,DMA_IT_TC,ENABLE); /* Enable DMA1 Channel6 transfer */ DMA_Cmd(DMA1_Channel6,ENABLE); ======================================================================= 外设的DMA请求映像
要使DMA与外设建立有效连接，这不是DMA自身的事情，是各个外设的事情，每个外设都有 一个 xxx_DMACmd(XXXx,Enable )函数，如果使DMA与ADC建立有效联系，就使用 ADC_DMACmd (ADC1,Enable); （这里我启用了ADC中的ADC1模块）。 /* DMA1 channel1 configuration ----------------------------------------------*/ DMA_DeInit(DMA1_Channel1); DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address; DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&AD_Value;?? //u16? AD_Value[2];?? 不加&应该也可以? 数组名 代表地址 DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; DMA_InitStructure.DMA_BufferSize = 2;??? ? //############## 改了 DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;? //##############??? ?改了 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_Channel1,&DMA_InitStructure); /* Enable DMA1 channel 1 */ DMA_Cmd(DMA1_Channel1,ENABLE); /* ADC1 configuration ------------------------------------------------------*/ ADC_InitStructure.ADC_Mode = ADC_Mode_Independent; ADC_InitStructure.ADC_ScanConvMode = ENABLE; ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None; ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; ADC_InitStructure.ADC_NbrOfChannel = 2;??? ? //##############??? ?改了 ADC_Init(ADC1,&ADC_InitStructure); //内部温度传感器? 添加这一句 /* Enable the temperature sensor and vref internal channel */ ADC_TempSensorVrefintCmd(ENABLE); //##############??? ?改了 //################ Channel 10(电位器) ADC_RegularChannelConfig(ADC1,ADC_Channel_10,1,ADC_SampleTime_13Cycles5); //###### 内部温度传感器? Channel 16 ################### ADC_RegularChannelConfig(ADC1,ADC_Channel_16,2,ADC_SampleTime_55Cycles5); ? /* Enable ADC1 DMA */ 使能ADC1的DMA请求映像 ? ADC_DMACmd(ADC1,ENABLE); /* Enable ADC1 */ ADC_Cmd(ADC1,ENABLE); /* Enable ADC1 reset calibaration register */?? //使用之前一定要校准 ADC_ResetCalibration(ADC1); /* Check the end of ADC1 reset calibration register */ while(ADC_GetResetCalibrationStatus(ADC1)); /* Start ADC1 calibaration */ ADC_StartCalibration(ADC1); /* Check the end of ADC1 calibration */ while(ADC_GetCalibrationStatus(ADC1)); /* Start ADC1 Software Conversion */ ADC_SoftwareStartConvCmd(ADC1,ENABLE); （编辑：李大同） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |
