STM32ADC多通道采样的例子

1、STM32ADC多通道转换描述：用ADC连续采集11路模拟信号，并由DMA传输到内存。ADC配置为扫描并且连续转换模式，ADC的时钟配置为12MHZo在每次转换结束后，由DMA循环将转换的数据传输到内存中。ADC可以连续采集N次求平均值。最后通过串II传输出最后转换的结果。程序如下:1ncludestiii32flOx.h这个头文件包括STM32F10X所有外閑寄存器、位、内存映射的定义1nclude”eval.h”头文件（包括串丨1、按键、LED的函数声明）1ncludeSysTickDelay.il1ncludeUART_INTERFACE.h1nclude#defineN50每通道采50

2、次特defineM12为12个通道ul6AD_ValueNM;用来存放ADC转换结果，也是DMA的目标地址nl6Aftei_filteiM;/用來冇放求平均值之后的结果lilti;voidGPIO_Configuration(void)GPIO_ImtTypeDefGPIO_IiiitStiiicture;GPIO_hutSu-uctuie.GPIO_Pin=GPIO_Pin_9;GPIO_ImtSuuctuie.GPIO_Mode=GPIO_Mode_AF_PP;因为USART1管脚是以复用的形式接到GPIOLI上的，所以使用复用推挽式输出GPIO_IiutSuuctuie.GPIO_Spe

3、ed=GPIO_Speed_50MHz;GPIO_Imt(GPIOA,&GPIO_InitStmcture);GPIO_IiutSti-uctuie.GPIO_Pin=GPIO_Pm_10;GPIO_IiutStmctuie.GPIO_Mode=GPIO_ModjIN_FLOATING;GPIO_Imt(GPIOA,&GPIO_InitStnicture);/PAO/1/2作为模拟通道输入引脚GPIOIiutStiuctuie.GPIOPin=GPIOPin0|GPIOPinllGPIOPin2IGPIOPin3;GPIO_ImtSuuctuie.GPIO_Mode=GPIO_ModjAIN;

4、模拟输入引脚GPIO_Imt(GPIOA,&GPIOJnitStnicture);/PB0/1作为模拟通道输入引脚GPIO_IiutSti-uctuie.GPIO_Pin=GPIO_Pm_0|GPIO_Pm_l;GPIO_ImtSuuctuie.GPIO_Mode=GPIO_ModjAIN;/模拟输入引脚GPIO_Imt(GPIOB,&GPIO_InitStmctme);/PCO/1/2/3/4/5作为模拟通道输入引脚GPIO_InitStiiictuie.GPIO_PinGPIOPinOlGPIOPin1IGPIOPin2|GPIOPin3IGPIOPin4IGPIOPin5;GPIO_Im

5、tSuuctuie.GPIO_Mode=GPIO_ModjAIN;模拟输入引脚GPIO_Imt(GPIOC,&GPIO_InitStRictuie);voidRCC_Coiifiguiation(void)EnorStatusHSEStartUpStatus;RCC.DelnitQ；/KCC系统复位RCC_HSEConfig(RCC_HSE_ON);开启HSEHSEStartUpStatus=RCC.WaitForHSEStaitUp();/等待HSE准备好if(HSEStartUpStatus=SUCCESS)FLASH_PrefetchBuffeiCmd(FLASH_PiefetcliBu

6、ffer-Enable);/EnablePrefetchBufferFLASH_SetLatencv(FLASH_Latencv_2);/Set2LatencycyclesRCC_HCLKConfig(RCCSYSCLK_Div1);/AHBclock=SYSCLKRCC_PCLK2Config(RCC_HCLK_Divl);/APB2clock=HCLKRCC_PCLKlConfig(RCC_HCLK_Div2);/APB1clock=HCLK2RCC_PLLConfig(RCC_PLLSource_HSE_Div1,RCC_PLLMul_6);/PLLCLK=12MHz*6=72MHzRC

7、C_PLLCmd(ENABLE);/EnablePLLwhileCRCC.GetFlagStatusCRCC.FLAG.PLLRDY)RESET);/WaittillPLLisreadyRCC_SYSCLKConfig(RCC_SYSCLKSouice_PLLCLK);/SelectPLLassystemclocksourcewhile(RCC_GetSYSCLKSouice()!=0 x08);/WaittillPLLisusedassystemclocksourceRCC.APB2PenphClockCmd(RCC_APB2Penph_GPIOA|RCC.APB2Periph_GPIOB|

8、RCC_APB2Periph.GPIOC|RCC_APB2Penph_ADC1|RCC_APB2Penph_AFIO|RCC_APB2Penph.USART1,ENABLE);使能ADC!通道时钟，各个管脚时钟RCC.ADCCLKConfig(RCC_PCLK2_Div6);/72M/6=12.ADC最人时间不能超过14MRCC.AHBPeiiphClockCmd(RCC.AHBPenpli_DMA1.ENABLE);/使能DMA传输voidADCl_Configuiation(void)ADC_InitTypeDefADC_InitStnicnire;ADC_DeInit(ADCl);/W外

9、设ADC1的全部寄存器重设为缺省值ADCJmtStnicture.ADC.Mode=ADC.ModeJndependent;/ADC工作模式【ADC1和ADC2工作在独立模式ADCJnitStnicture.ADC.ScanConvMode=ENABLE;/模数转换丁作在扫描模式ADC_InitStmcture.ADC_ContinuousConvMode=ENABLE;模数转换匸作在连续转换模式ADC_InitStnictuie.ADC_ExternalTngConv=ADC_ExternalTngConv_None;外部触发转换关闭ADC_ImtStmctuie.ADC_DataAlign

10、=ADC_DataAlign_Right;/ADC数据右对齐ADCJnitStnicture.ADC-NbiOfChaimel=M;顺序进行规则转换的ADC通道的数目ADCJmt(ADCl,&ADC_InitSuuctuie);根据ADC_ImtStiiict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/ADC1,ADC通道x,规则采样顺序值为y,采样时间为239.5周期ADC_RegulaiChamielConfig(ADC1,ADC_ChaniieLO,1,ADC_SampleTime_239Cycles5);ADC_RegulaiCham

11、ielConfig(ADC1,ADC_ChaniieLl,2,ADC_SampleTime_239Cycles5);ADC_RegulaiChamielConfig(ADC1,ADC_ChaniieL2,3,ADC_SampleTime_239Cycles5);ADC_RegulaiChamielConfig(ADC1,ADC_ChaniieL3,4,ADC_SampleTime_239Cycles5);ADC_RegulaiChamielConfig(ADC1,ADC_ChaniieL8,5,ADC_SampleTime_239Cycles5);ADC_RegulaiChamielConfi

12、g(ADC1,ADC_ChaniieL9,6,ADC_SampleTime_239Cycles5);ADC_RegulaiChamielConfig(ADC1,ADC_ChaniieLl0,7,ADC_SampleTune_239Cvcles5);ADC_RegularChaiiiielConfig(ADC1,ADC_ChaniieLl1,&ADC_SampleTime_239Cycbs5);ADC_RegulaiChaniielConfig(ADC1,ADC_ChaniieL12,9,ADC_SampleTune_239Cvcles5);ADC_RegulaiChaimelConfig(AD

13、C1,ADC_ChaimeL13,10,ADC_SampleTime_239Cycbs5);ADC_RegulaiChamielConfig(ADC1,ADC_ChaniieL14,11,ADC_SampleTune_239Cvcles5);ADC_RegulaiChaimelConfig(ADC1,ADC_ChaimeLl5,12,ADC_SampleTime_239Cycbs5);/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);ADC_Cmd(ADCl,ENABLE);使能指定的ADC1ADC_ResetCalibi

14、ation(ADCl);/复位指定的ADC1的校准寄存器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.StartCalibiation(ADC1);开始指定ADC1的校准状态while(ADC_GetCalibrationStatus(ADCl);获取指定ADC1的校准程序，设置状态则等待voidDMA_Configuration(void)DNfA_InitTypeDefDMA_IintStRictuie;DMA_Denut(DNIACChaiinell);/将DMA的通道1寄存器重设为缺省値DM

15、A_InitSu-uctuie.DMA_PeripheialBaseAddi=(u32)&ADC1-DR;/DMA外设ADC基地址DMA_IiiitSti-uctuie.DMA_MemoiyBaseAddr=(u32)&AD_Value;/DMA内存基地址DMA_InitSuiictuie.DMA_DIR=DMA_DIR_PenpheialSRC;内存作为数据传输的目的地DNlA_InitSuiictuie.DNIA_BufferSize=N*M;/DMA通道的DMA缓存的人小DMA_InitSti-uctuie.DMA_PeripheialInc=DMA.Penpheiallnc.Disab

16、le;/外设地址寄存器不变DNlA_InitStnictuie.DNfA_MemoiyInc=DMA.MemoiyliicEnable;内存地址寄存器递增DMA_IiutSu-uctuie.DMA_PenpheialDataSize=DNIA_PenpheralDataSize_Half-7oid;数据宽度为16位DMA_IiiitSti-uctufe.DMA_MemoiyDataSize=DMA_MemoiyDataSize_HalfW7oid;/数据宽度为16位DMA_InitSti-uctuie.DMA_Mode=DMA_Mode_Cucular;匸作在循环缓存模式DNlA_InitSt

17、mcture.D2vIA_Pilontv=DMA_Piiority_High;/DMA通道x拥有高优先级DMA_InitSuuctuie.DNIA.M2M=DMA_M2M_Disable;/DMA通道x没有设置为内存到内存传输DMA_Imt(DMAl_Cluinnel1,&DMA_InitStnicture);根据DMA_LutStmct中指定的参数初始化DMA的通道配置所有外设voidImt_All_Penph(void)RCC_Configuration();GPIO_Configuiation();ADC1_Coiifiguiation();DMA_Configuiation();/US

18、ART1_Coiifiguiation();USART_Configuiation(9600);ul6GetVolt(ul6advalue)letuin(ul6)(advalue*330/4096);/求的结果扩人了100倍，方便卜而求出小数voidfilter(void)fimtsum=0;u8count;foi(i=0;i12;i+)fifoi(count=0;countN;count+)fisum+=AD_Valuecount1;Aftei_filteri=sunvN;sum=0;mtmam(void)ul6valueMJ;mit_All_PenpliQ;SysTick_Imtaize();ADC_SoftwaieStartConvCmd(ADC1.ENABLE);DMA_Cmd(DMA1.Channel1,ENABLE);启动DMA通道while(l)while(USART.GetFlagStatus(USART1,USART_FLAG.TXE)=RESET);/等待传输完成否则第一位数据容易丢失filterQ;fbi(i=0;i12;i-H-)v