STM32 ADC结合DMA数据采样与软件滤波处理

传感器）
void ADC1_Configuration(void)
{
ADC_InitTypeDef ADC_InitStructure;

ADC_InitStructure.ADC_Mode = ADC_Mode_Independent; //转换模式为独立，还有交叉等非常多样的选择
ADC_InitStructure.ADC_ScanConvMode = ENABLE;
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;//连续转换开启
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfChannel = 3; //设置转换序列长度为3，三通道
ADC_Init(ADC1, &ADC_InitStructure);

//ADC内置温度传感器使能（要使用片内温度传感器，切忌要开启它）
ADC_TempSensorVrefintCmd(ENABLE);

//常规转换序列1：通道10
ADC_RegularChannelConfig(ADC1, ADC_Channel_10, 1, ADC_SampleTime_239Cycles5);
//常规转换序列2：通道16（内部温度传感器），采样时间>2.2us,(239cycles)
ADC_RegularChannelConfig(ADC1, ADC_Channel_16, 2, ADC_SampleTime_239Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 3, ADC_SampleTime_239Cycles5);
//输入参数：ADC外设，ADC通道，转换序列顺序，采样时间
// Enable ADC1
ADC_Cmd(ADC1, ENABLE);
// 开启ADC的DMA支持（要实现DMA功能，还需独立配置DMA通道等参数）
ADC_DMACmd(ADC1, ENABLE);

// 下面是ADC自动校准，开机后需执行一次，保证精度
// Enable ADC1 reset calibaration register
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));
// ADC自动校准结束---------------
ADC_SoftwareStartConvCmd(ADC1, ENABLE); //ADC启动
}
DMA配置：（无软件滤波）
void DMA_Configuration(void)
{
DMA_InitTypeDef DMA_InitStructure;

DMA_DeInit(DMA1_Channel1);
DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address; //DMA外设地址，在头部定义
DMA_InitStructure.DMA_MemoryBaseAddr = (u32)&AD_Value; //内存地址
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; //外设至内存模式
//BufferSize=2，因为ADC转换序列有2个通道
//如此设置，使序列1结果放在AD_Value[0]，序列2结果放在AD_Value[1]
DMA_InitStructure.DMA_BufferSize = 3; //一次转换三个
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //接受一次后，设备地址不后移
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //接受一次后，内存地址后移
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; //每次传输半字
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
//循环模式开启，Buffer写满后，自动回到初始地址开始传输
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);
//配置完成后，启动DMA通道
DMA_Cmd(DMA1_Channel1, ENABLE);
}
此DMA例程用于单次ADC转换，配合软件滤波可做如下改动：
全局声明：
vu16 AD_Value[30][3]; //AD采样值
vu16 After_filter[3]; //AD滤波后
DMA部分：(带中断滤波)
void DMA_Configuration(void)
{
DMA_InitTypeDef DMA_InitStructure;

DMA_DeInit(DMA1_Channel1);
DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address;
DMA_InitStructure.DMA_MemoryBaseAddr = (u32)&AD_Value;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
//BufferSize=2，因为ADC转换序列有2个通道
//如此设置，使序列1结果放在AD_Value[0]，序列2结果放在AD_Value[1]
DMA_InitStructure.DMA_BufferSize = 90;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
//循环模式开启，Buffer写满后，自动回到初始地址开始传输
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);
//配置完成后，启动DMA通道
DMA_Cmd(DMA1_Channel1, ENABLE);
DMA_ITConfig(DMA1_Channel1, DMA_IT_TC, ENABLE); //使能DMA传输完成中断

}
NVIC部分：
NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel1_IRQChannel;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure); // Enable the DMA Interrupt
stm32f10x_it.c文件：
void DMA1_Channel1_IRQHandler(void)
{
if(DMA_GetITStatus(DMA1_IT_TC1) != RESET)
{
filter();
DMA_ClearITPendingBit(DMA1_IT_TC1);
}
}
滤波部分：（均值滤波）
#define N 30
void filter(void)
{
intsum = 0;
u8 count,i;
for(i=0;i<2;i++)
{
for ( count=0;count{
sum += AD_Value[count][i];
}
After_filter[i]=sum/N;
sum=0;
}

}
采样数据与实际电压/温度转换：
u16 GetTemp(u16 advalue)
{
u32 Vtemp_