STM32利用DMA实现多通道ADC转换程序实例

1、网上很多类似资料，总结就是要么给出不完整的一部分，要么就是没有标注说明之类的，鞋面我给大家贴出实用型的，包括如何配置DMA和ADC，如何采集数据，如何处理数据/系统时钟使用72MHZunsigned short AD_Value5=0;/定义成半字节数组void RCC_Config(void)ErrorStatus HSEStartUpStatus;/定义枚举型变量RCC_DeInit();RCC_HSEConfig(RCC_HSE_ON);HSEStartUpStatus = RCC_WaitForHSEStartUp();if(HSEStartUpStatus=SUCCESS)RCC_H

2、CLKConfig(RCC_SYSCLK_Div1);RCC_PCLK2Config(RCC_HCLK_Div1);RCC_PCLK1Config(RCC_HCLK_Div2);FLASH_SetLatency(FLASH_Latency_2);FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);RCC_PLLConfig(RCC_PLLSource_HSE_Div1,RCC_PLLMul_9);RCC_PLLCmd(ENABLE);while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY)=RESET);RCC_SY

3、SCLKConfig(RCC_SYSCLKSource_PLLCLK);while(RCC_GetSYSCLKSource()!=0x08);/-打开设备时钟-/RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB|RCC_APB2Periph_GPIOF,ENABLE);/RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);/开串口1和ADC1的时钟void ADC_Start(void)DMA_Cmd(DMA1_Channel1, ENABLE); /启动DMA

4、通道ADC_SoftwareStartConvCmd(ADC1, ENABLE);/软件启动转换void DMA_ADC_Config(void)ADC_InitTypeDef ADC_InitStructure;DMA_InitTypeDef DMA_InitStructure;GPIO_InitTypeDef GPIO_InitStructure;GPIO_InitStructure.GPIO_Pin = (GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7);GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; /

5、设置成模拟输入GPIO_Init(GPIOA, &GPIO_InitStructure);GPIO_InitStructure.GPIO_Pin = (GPIO_Pin_0);GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; /设置成模拟输入GPIO_Init(GPIOB, &GPIO_InitStructure);RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1,ENABLE);/开ADC1的时钟RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1,ENABLE); /开DMA时钟RCC

6、_ADCCLKConfig(RCC_PCLK2_Div8);/配置ADC时钟，为PCLK2的8分频，即9MHzDMA_DeInit(DMA1_Channel1);/ADC挂接在DMA的通道1上DMA_InitStructure.DMA_PeripheralBaseAddr = ADC_DR_ADDRESS; /DMA外设ADC基地址DMA_InitStructure.DMA_MemoryBaseAddr = (u32)&AD_Value;DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; /内存作为数据传输的目的地DMA_InitStructu

7、re.DMA_BufferSize = 5; /DMA通道的DMA缓存的大小 系统用5个通道DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; /外设地址寄存器不变 即地址ADC1-DR不变DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; /内存地址寄存器递增 即数组AD_Value地址增加DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; /数据宽度为16

8、位，这里尤其注意因为选择的是半字节的，所以定义数组的时候也要定义成半字节数组，否则采集数据出乱，很多人是贴出资料来了，但是根本没有把这些注意点写明DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; /数据宽度为16位DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; /工作在循环缓存模式DMA_InitStructure.DMA_Priority = DMA_Priority_High; /DMA通道 x拥有高优先级DMA_InitStructure.DMA_M2M

9、= DMA_M2M_Disable; /DMA通道x设置为非内存到内存传输DMA_Init(DMA1_Channel1, &DMA_InitStructure);/DMA_ITConfig(DMA1_Channel1,DMA_IT_TC,ENABLE);ADC_DeInit(ADC1);ADC_InitStructure.ADC_Mode = ADC_Mode_Independent; /ADC工作模式:ADC1和ADC2工作在独立模式ADC_InitStructure.ADC_ScanConvMode =ENABLE; /模数转换工作在扫描模式ADC_InitStructure.ADC_Co

10、ntinuousConvMode = ENABLE;/连续转换/ADC_InitStructure.ADC_ContinuousConvMode = DISABLE; /注意不要使用持续转换模式，否则只要触发一次后续的转换就会永不停歇（除非CONT清0），这样第一次以后的ADC，就不是由TIM1_CC1来触发了 ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; /ADC数据右对齐ADC_InitStru

11、cture.ADC_NbrOfChannel = 5; /顺序进行规则转换的ADC通道的数目ADC_Init(ADC1, &ADC_InitStructure); /根据ADC_InitStruct中指定的参数初始化外设ADCx的寄存器/设置指定ADC的规则组通道，设置它们的转化顺序和采样时间ADC_RegularChannelConfig(ADC1, ADC_Channel_4, 1, ADC_SampleTime_239Cycles5);ADC_RegularChannelConfig(ADC1, ADC_Channel_5, 2, ADC_SampleTime_239Cycles5);A

12、DC_RegularChannelConfig(ADC1, ADC_Channel_6, 3, ADC_SampleTime_239Cycles5);ADC_RegularChannelConfig(ADC1, ADC_Channel_7, 4, ADC_SampleTime_239Cycles5);ADC_RegularChannelConfig(ADC1, ADC_Channel_8, 5, ADC_SampleTime_239Cycles5);ADC_ExternalTrigInjectedConvCmd(ADC1,DISABLE);ADC_DMACmd(ADC1, ENABLE); /

13、 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_Cmd(ADC1, ENABLE); /使能指定的ADC1ADC_ResetCalibration(ADC1);/复位校准寄存器while(ADC_GetResetCalibrationStatus(ADC1); /获取ADC1复位校准寄存器的状态,设置状态则等待ADC_StartCalibration(ADC1); /开始指定ADC1的校准状态while(ADC_GetCalibrationStatus(ADC1); /获取指定ADC1的校准程序,设置状态则等待ADC_Start();/数据采集处理void A

14、DC_DateProcess(void)unsigned char i,k,h;unsigned int Buf=0;/递推 先进先出原理ADCCollect.PVVoltageBuf9=get_ChannelVale(ADC_Channel_4)&0xfff;ADCCollect.BatteryVoltageBuf9=get_ChannelVale(ADC_Channel_5)&0xfff;ADCCollect.CirTem1Buf9=get_ChannelVale(ADC_Channel_6)&0xfff;ADCCollect.BatteryChargeCurrentBuf9=get_Ch

15、annelVale(ADC_Channel_7)&0xfff;ADCCollect.BatteryDisChargeCurrentBuf9=get_ChannelVale(ADC_Channel_8)&0xfff;for(i=0;i9;i+)ADCCollect.PVVoltageBufi=ADCCollect.PVVoltageBuf1+i;ADCCollect.BatteryVoltageBufi=ADCCollect.BatteryVoltageBuf1+i;ADCCollect.CirTem1Bufi=ADCCollect.CirTem1Buf1+i;ADCCollect.Batter

16、yChargeCurrentBufi=ADCCollect.BatteryChargeCurrentBuf1+i; ADCCollect.BatteryDisChargeCurrentBufi=ADCCollect.BatteryDisChargeCurrentBuf1+i;/排序for(k=0; k9; k+ )/for(h=0 ; h ADCCollect.PVVoltageBufh+1)Buf = ADCCollect.PVVoltageBufh+1;ADCCollect.PVVoltageBufh+1 = ADCCollect.PVVoltageBufh;ADCCollect.PVVo

17、ltageBufh = Buf;Buf=0;if(ADCCollect.BatteryVoltageBufh ADCCollect.BatteryVoltageBufh+1)Buf = ADCCollect.BatteryVoltageBufh+1;ADCCollect.BatteryVoltageBufh+1 = ADCCollect.BatteryVoltageBufh;ADCCollect.BatteryVoltageBufh = Buf;Buf=0;if(ADCCollect.CirTem1Bufh ADCCollect.CirTem1Bufh+1)Buf = ADCCollect.C

18、irTem1Bufh+1;ADCCollect.CirTem1Bufh+1 = ADCCollect.CirTem1Bufh;ADCCollect.CirTem1Bufh = Buf;Buf=0;if(ADCCollect.BatteryChargeCurrentBufh ADCCollect.BatteryChargeCurrentBufh+1)Buf = ADCCollect.BatteryChargeCurrentBufh+1;ADCCollect.BatteryChargeCurrentBufh+1 = ADCCollect.BatteryChargeCurrentBufh;ADCCo

19、llect.BatteryChargeCurrentBufh = Buf;ADCCollect.CirTem1=0;ADCCollect.BatteryChargeCurrent=0;ADCCollect.BatteryDisChargeCurrent=0;ADCCollect.BatteryVoltage=0;ADCCollect.PVVoltage=0;/去掉最大值和最小值 取平均值for(i=3;i7;i+)/ADCCollect.CirTem1+=ADCCollect.CirTem1Bufi;ADCCollect.BatteryChargeCurrent+=ADCCollect.Bat

20、teryChargeCurrentBufi;ADCCollect.BatteryDisChargeCurrent+=ADCCollect.BatteryDisChargeCurrentBufi;ADCCollect.BatteryVoltage+=ADCCollect.BatteryVoltageBufi;ADCCollect.PVVoltage+=ADCCollect.PVVoltageBufi;ADCCollect.CirTem1=ADCCollect.CirTem1/4;ADCCollect.BatteryChargeCurrent=ADCCollect.BatteryChargeCurrent/4;ADCCollect.BatteryDisChargeCurrent=ADCCollect.BatteryDisChargeCurrent/4;ADCCollect.BatteryVoltage=ADCCollect.BatteryVoltage/4;ADCCollect.PVVoltage=ADCCollect.PVVoltage/4;/充电电流ADCCollect.BatteryChargeCurrent=(ADCCollect.BatteryChargeCurrent*33)/4096;ADCCollect.BatteryC