STM32 DMA学习

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_V3.1.2\Project\STM32F10x_StdPeriph_Examples\DMA\FLASH_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);