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这里使用STM32F407实现adc的多通道采集，使用的传感器为灰度传感器与红外传感器，在面放出代码，具体的解释在注释中都写的很详细。
传感器的IO口配置
void DMA_GPIO_config()
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE); //使能GPIOA时钟
//先初始化ADC1通道IO口（灰度）
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | //灰度传感器暂时保留2个接口
GPIO_Pin_2 | GPIO_Pin_3 | //红外传感器PA端口
GPIO_Pin_4 | GPIO_Pin_5 |
GPIO_Pin_6 | GPIO_Pin_7 ;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN; //模拟输入
GPIO_Init(GPIOA, &GPIO_InitStructure); //初始化
//先初始化ADC1通道IO口（红外）
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 |
GPIO_Pin_2 | GPIO_Pin_3 ; //红外传感器PA端口
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_Init(GPIOC, &GPIO_InitStructure);
}adc初始化配置
void DMA_ADC_config()
{
ADC_CommonInitTypeDef ADC_CommonInitStructure;
ADC_InitTypeDef ADC_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE); //使能ADC1时钟
RCC_APB2PeriphResetCmd(RCC_APB2Periph_ADC1,ENABLE); //ADC1复位
RCC_APB2PeriphResetCmd(RCC_APB2Periph_ADC1,DISABLE); //复位结束
ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent; //独立模式
ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_10Cycles; //两个采样阶段之间的延迟x个时钟
ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_1; //DMA使能（DMA传输下要设置使能）
ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div4; //预分频4分频。ADCCLK=PCLK2/4=84/4=21Mhz,ADC时钟最好不要超过36Mhz
ADC_CommonInit(&ADC_CommonInitStructure); //初始化
ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b; //12位模式
ADC_InitStructure.ADC_ScanConvMode =ENABLE; //扫描（开启DMA传输要设置扫描）
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; //开启连续转换（开启DMA传输要设置连续转换）
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None; //禁止触发检测，使用软件触发
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //右对齐
ADC_InitStructure.ADC_NbrOfConversion = 12; //有几个通道传输就写几 （DMA传输下要设置为通道数）
ADC_Init(ADC1, &ADC_InitStructure); //ADC初始化
ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_144Cycles); //res[0]
ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 2, ADC_SampleTime_144Cycles); //res[1]
ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 3, ADC_SampleTime_144Cycles); //res[2]
ADC_RegularChannelConfig(ADC1, ADC_Channel_3, 4, ADC_SampleTime_144Cycles); //res[3]
ADC_RegularChannelConfig(ADC1, ADC_Channel_4, 5, ADC_SampleTime_144Cycles); //res[4]
ADC_RegularChannelConfig(ADC1, ADC_Channel_5, 6, ADC_SampleTime_144Cycles); //res[5]
ADC_RegularChannelConfig(ADC1, ADC_Channel_6, 7, ADC_SampleTime_144Cycles); //res[6]
ADC_RegularChannelConfig(ADC1, ADC_Channel_7, 8, ADC_SampleTime_144Cycles); //res[7]
ADC_RegularChannelConfig(ADC1, ADC_Channel_10, 9, ADC_SampleTime_144Cycles); //res[8]-PC0
ADC_RegularChannelConfig(ADC1, ADC_Channel_11, 10, ADC_SampleTime_144Cycles); //res[9]-PC1
ADC_RegularChannelConfig(ADC1, ADC_Channel_12, 11, ADC_SampleTime_144Cycles); //res[8]-PC2
ADC_RegularChannelConfig(ADC1, ADC_Channel_13, 12, ADC_SampleTime_144Cycles); //res[9]-PC3
ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);
ADC_DMACmd(ADC1, ENABLE);
ADC_Cmd(ADC1, ENABLE); //开启AD转换器
}DMA各通道配置
//DMAx的各通道配置
//这里的传输形式是固定的,这点要根据不同的情况来修改
//从存储器->外设模式/8位数据宽度/存储器增量模式
//DMA_Streamx:DMA数据流,DMA1_Stream0~7/DMA2_Stream0~7
//chx:DMA通道选择,@ref DMA_channel DMA_Channel_0~DMA_Channel_7
//par:外设地址
//mar:存储器地址
//ndtr:数据传输量
void DMA_config(DMA_Stream_TypeDef *DMA_Streamx, u32 chx, u32 par, u32 mar, u16 ndtr)
{
DMA_InitTypeDef DMA_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
if((u32)DMA_Streamx>(u32)DMA2) //得到当前stream是属于DMA2还是DMA1
{
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2,ENABLE); //DMA2时钟使能
}else
{
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1,ENABLE); //DMA1时钟使能
}
DMA_DeInit(DMA_Streamx);
while (DMA_GetCmdStatus(DMA_Streamx) != DISABLE){} //等待DMA可配置
/* 配置 DMA Stream */
DMA_InitStructure.DMA_Channel = chx; //通道选择
DMA_InitStructure.DMA_PeripheralBaseAddr = par; //DMA外设地址
DMA_InitStructure.DMA_Memory0BaseAddr = mar; //DMA 存储器0地址
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory; //存储器到外设模式
DMA_InitStructure.DMA_BufferSize = ndtr; //数据传输量
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外设非增量模式
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //存储器增量模式
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; //外设数据长度:8位
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; //存储器数据长度:8位
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; //使用普通模式
DMA_InitStructure.DMA_Priority = DMA_Priority_Medium; //中等优先级
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single; //存储器突发单次传输
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single; //外设突发单次传输
DMA_Init(DMA_Streamx, &DMA_InitStructure); //初始化DMA Stream
DMA_ClearFlag(DMA2_Stream0,DMA_IT_TC);
DMA_ITConfig(DMA2_Stream0,DMA_IT_TC,ENABLE);
NVIC_InitStructure.NVIC_IRQChannel=DMA2_Stream0_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0x01; //抢占优先级
NVIC_InitStructure.NVIC_IRQChannelSubPriority=0x01; //响应优先级
NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
NVIC_Init(&NVIC_InitStructure);
while (DMA_GetCmdStatus(DMA2_Stream0) != DISABLE){}
DMA_Cmd(DMA2_Stream0, ENABLE);
}
整体的配置函数
void MYDMA_Config(DMA_Stream_TypeDef *DMA_Streamx, u32 chx, u32 par, u32 mar, u16 ndtr)
{
DMA_GPIO_config();
DMA_ADC_config();
DMA_config(DMA_Streamx, chx, par, mar, ndtr);
}
将采集到的adc值放入数组中保存
#define PER 12 //外设数量
#define NUM 10 //采集次数u16 res[PER];
u16 fir[NUM][PER];extern u16 res[PER];
extern u16 fir[NUM][PER];
void filter(void)
{
register u16 sum=0;
u8 count=0,i=0,j=0;
for(;i<PER;i++)
{
while(j<NUM)
{//865
if(fir[j][i]<0){}
else
{
sum+=fir[j][i];
count++;
}
j++;
}
res[i]=sum/count;
sum=0;count=0;j=0;
}
}DMA传输开启函数
//开启一次DMA传输
//DMA_Streamx:DMA数据流,DMA1_Stream0~7/DMA2_Stream0~7
//ndtr:数据传输量
void DMA2_Stream0_IRQHandler(void)
{
if (DMA_GetFlagStatus(DMA2_Stream0, DMA_IT_TCIF0) == SET)
{
filter();
DMA_ClearFlag(DMA2_Stream0, DMA_IT_TCIF0);
}
}
最后在主函数中调用以下两句即可开启传输
MYDMA_Config(DMA2_Stream0, DMA_Channel_0, (u32)&ADC1->DR, (u32)fir, NUM*PER);
ADC_SoftwareStartConv(ADC1); //开启DMA