嵌入式系统应用ADC模拟电压采集肖迎春9课件

嵌入式系统应用肖迎春Email:QQ:787522366Tel：1目录任务1:ADC--模拟电压采集STM32ADC介绍2STM32的A/D转换器STM32单片机有2个独立的ADC控制器，有18个通道，可测量16个外部信号和2个内部信号源：内部温度传感器和内部参考电压(Bandgapvoltage)。ADC电源要求:2.4Vto3.6V。ADC输入范围:VREF-≤VIN≤VREF+(VREF+andVREF-availableonlyinLQFP100package)精度：12位。结果可按左对齐或右对齐的方式存放在16位寄存器中。A/D转换的过程：采用、保持、量化、编程。采样时间越长，转换结果越稳定。采样时间可设置为：1.5个/7.5个/13.5个/28.5个ADC时钟周期。ADC转换时间采用时间+转换时间转换时间：12.5个时钟周期。3STM32的A/D转换器转换模式：

单次/连续/扫描/间断/双重。

扫描模式如果没有启动，则启动一次AD转换只会转换第一个通道；扫描模式如果启动，则启动一次AD转换会对所有通道进行转换。如果是单次模式，启动后一次转换完成后不再转换，如果是连续模式，则一次转换完后继续反复转换。 STM32的16个外部ADC通道可分为两组:规则的和注入的。每个组可以是这16个通道中的任意一些通道以任意顺序进行的组合。规则组最多有16个通道，通道和转换顺序在ADC规则系列寄存器x(ADC_JSQR)中选择。注入组最多有4个通道。通道和转换顺序在ADC注入系列寄存器(ADC_JSQR)中选择。5STM32的A/D转换器ADC端口： PA0~PA7:ADC_IN0~ADC_IN7PB0~PB1:ADC_IN8~ADC_IN9 PC0~PC5:ADC_IN10~ADC_IN15输入信号量程：VREF-~VREF+(0~3.3V)本电路板的模拟电压（电位器）连在PC0端口。

6任务1:ADC模拟电压采集任务：编程从STM32的ADC采集电位器上的模拟电压，通过串口输出到PC上，串口终端接收显示出来目的：掌握STM32ADC的应用及库函数的使用步骤：建立自己的项目文件夹建立Keil工程项目，命名为ADC.uvproj,保存到MDK目录下项目中添加main.c、retarget.c和标准外设库STM32StdPeriphLib.lib配置好C/C++头文件路径和调试工具参数将实验板上的跳线J61,J62接到RS232&RS485端，跳线J59,J60接到RS232端；连接好仿真器和实验板编译、下载程序打开PC机上的串口终端，选择正确的端口和波特率调整电位R2，观察串口接收窗口的数据修改代码，将ADC的数值转换为实际电压值，通过串口将结果发回PC，同时在电压值<1.0V时LED闪烁，电压值>2.5V时蜂鸣器报警；7任务1：配置Debug配置：1、Debug配置9任务1：配置下载工具配置：1、下载工具配置2、设置3、添加下载算法：Stm32F10xConnectivityLine10ADC库函数功能描述USART标准库函数的说明参考课本p335表C.9在软件开发时，adc标准库函数的参数使用，可以参考头文件stm32f10x.h、stm32f10x_adc.h11使用STM32ADC的步骤ADC_Init()初始化,ADC_RegularChannelConfig()设置通道和转化顺序及时间，ADC_Cmd()使能 /*ADC1configuration------------------------------------------------------*/ 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=1; ADC_Init(ADC1,&ADC_InitStructure); /*ADC1regularchannel10configuration*/ ADC_RegularChannelConfig(ADC1,ADC_Channel_10,1,ADC_SampleTime_55Cycles5); /*EnableADC1*/ ADC_Cmd(ADC1,ENABLE);

13使用STM32ADC的步骤重置校验寄存器，等待重置完成，开始校验，等待校验完成 /*EnableADC1resetcalibarationregister*/ ADC_ResetCalibration(ADC1); /*ChecktheendofADC1resetcalibrationregister*/ while(ADC_GetResetCalibrationStatus(ADC1)); /*StartADC1calibaration*/ ADC_StartCalibration(ADC1); /*ChecktheendofADC1calibration*/ while(ADC_GetCalibrationStatus(ADC1));

/*StartADC1SoftwareConversion*/ ADC_SoftwareStartConvCmd(ADC1,ENABLE);调用ADC_GetConversionValue获取结果

AD_value=ADC_GetConversionValue(ADC1);14ADC库函数voidADC_DeInit(ADC_TypeDef*ADCx);voidADC_Init(ADC_TypeDef*ADCx,ADC_InitTypeDef*ADC_InitStruct);voidADC_StructInit(ADC_InitTypeDef*ADC_InitStruct);voidADC_Cmd(ADC_TypeDef*ADCx,FunctionalStateNewState);voidADC_DMACmd(ADC_TypeDef*ADCx,FunctionalStateNewState);voidADC_ITConfig(ADC_TypeDef*ADCx,uint16_tADC_IT,FunctionalStateNewState);voidADC_ResetCalibration(ADC_TypeDef*ADCx);FlagStatusADC_GetResetCalibrationStatus(ADC_TypeDef*ADCx);voidADC_StartCalibration(ADC_TypeDef*ADCx);FlagStatusADC_GetCalibrationStatus(ADC_TypeDef*ADCx);voidADC_SoftwareStartConvCmd(ADC_TypeDef*ADCx,FunctionalStateNewState);FlagStatusADC_GetSoftwareStartConvStatus(ADC_TypeDef*ADCx);voidADC_DiscModeChannelCountConfig(ADC_TypeDef*ADCx,uint8_tNumber);voidADC_DiscModeCmd(ADC_TypeDef*ADCx,FunctionalStateNewState);15ADC库函数voidADC_SetInjectedOffset(ADC_TypeDef*ADCx,uint8_tADC_InjectedChannel,uint16_tOffset);uint16_tADC_GetInjectedConversionValue(ADC_TypeDef*ADCx,uint8_tADC_InjectedChannel);voidADC_AnalogWatchdogCmd(ADC_TypeDef*ADCx,uint32_tADC_AnalogWatchdog);voidADC_AnalogWatchdogThresholdsConfig(ADC_TypeDef*ADCx,uint16_tHighThreshold,uint16_tLowThreshold);voidADC_AnalogWatchdogSingleChannelConfig(ADC_TypeDef*ADCx,uint8_tADC_Channel);voidADC_TempSensorVrefintCmd(FunctionalStateNewState);FlagStatusADC_GetFlagStatus(ADC_TypeDef*ADCx,uint8_tADC_FLAG);voidADC_ClearFlag(ADC_TypeDef*ADCx,uint8_tADC_FLAG);ITStatusADC_GetITStatus(ADC_TypeDef*ADCx,uint16_tADC_IT);voidADC_ClearITPendingBit(ADC_TypeDef*ADCx,uint16_tADC_IT);*函数说明参考课本附录C表C.9，p335页17STM32的ADC介绍ADC转换率达1MHz，精度为12位ADC电源要求:2.4Vto3.6VADC输入范围:VREF-≤VIN≤VREF+(VREF+andVREF-availableonlyinLQFP100package)Dualmode(ondeviceswith2ADCs):8conversionmode多达18个通道:

16externalchannels2internalchannels:与温度传感器和内部参考电压连接(Bandgapvoltage)Channelsconversiongroups:Upto16channelsregulargroupUpto4channelsinjectedgroupSingleandcontinuousconversionmodes18STM32的ADC介绍自动从通道0到通道‘n’进行转换的扫描模式ChannelbychannelprogrammablesamplingtimeandconversionorderDiscontinuousmodeonregularandinjectedgroupsSelf-calibrationLeftorrightDataalignmentwithinbuiltdatacoherencyAnalogWatchdogonhighandlowthresholdsInterruptgenerationon:EndofConversionEndofInjectedconversionAnalogwatchdogDMAcapability(onlyonADC1)19ADCRegularchannelsgroupProgrammablenumberofregularchannels:Upto16channelsProgrammablesampletimeandorderofeachchannelintheconversionsequenceConversionstartedby:SoftwarethroughstartbitExternaltriggergeneratedby:Timer1CC1Timer1CC2Timer1CC3Timer2CC2Timer3TRGOTimer4CC4EXTILine1121ADCInjectedchannelsgroupProgrammablenumberofinjectedchannels:Upto4channelsProgrammablesampletimeandorderofeachchannelintheconversionsequenceConversionstartedby:JAUTO:automaticinjectedconversionafterregularchannelsconversionSoftwarethroughstartbitExternaltriggergeneratedby:Timer1TRGOTimer1CC4Timer2TRGOTimer2CC1Timer3CC4Timer4TRGOEXTILine1522AnalogsampletimeADCCLK,upto14MHz,takenfromPCLK2throughaprescaler(Div2,Div4,Div6andDiv8)Threebitsprogrammablesampletimecyclesforeachchannel:1.5cycles7.5cycles13.5cycles28.5cycles41.5cycles55.5cycles71.5cycles239.5cyclesTotalconversion=Sampletime+12.5cycles(fixedtime)@14MHzandSampletime=1.5cycletotalconversion:1µs(14cycles)ADCADCCLKADCPrescalers:Div2,Div4,Div6andDiv8PCLK255.5cycles7.5cycles71.5cycles41.5cycles13.5cycles28.5cycles1.5cycles239.5cyclesSampleTimeSelectionSMPx[2:0]23ADCdiscontinuousconversionmodeSplitchannelsconversionsequenceintosub-sequencesAvailableforbothregularandinjectedgroups:Upto8conversionforregularchannel1conversionforinjectedchannelExample:-Conversionofchannels:0,1,2,4,5,8,9,11,12,13,14and15-DiscontinuousmodeNumberofchannelis3Channel0Channel1Channel2Channel4Channel5Channel8Channel9Channel11Channel12Channel13Channel14Channel151sttrigger2ndtrigger3rdtrigger4thtriggerEndofConversionChannel0Channel1Channel25thtrigger…Note:

Donotusediscontinuousmodeforbothregularandinjectedtogether.Itcanbeusedonlyforonegroupchannel25ADCDataalignmentOnebitdataalignselection:rightorleftForinjectedchannelconversionnegativevalueaftersubtractionoftheoffsetthesignisextendedinrightalignmentSEXTSEXTSEXTSEXTD11D10D9D8D7D6D5D4D3D2D1D0Rightalignment0000D11D10D9D8D7D6D5D4D3D2D1D0SEXT000D11D10D9D8D7D6D5D4D3D2D1D0Leftalignment0000D11D10D9D8D7D6D5D4D3D2D1D0RegulargroupInjectedgroupRegulargroupInjectedgroup26ADCdualmodes(1/9)AvailableindeviceswithtwoADCs:ADC1masterandADC2slaveADC1andADC2triggersaresynchronizedinternallyforregularandinjectedchannelsconversion8ADCdualmodesGPIOPortsTempSensorVREFINTUpto4injectedchannelsUpto16regularchannelsADC_IN0ANALOGMUX…ADC_IN1ADC_IN15ADC1AnalogADC2AnalogDigitalMasterDigitalSlaveExternaleventsynchronizationExternalevent(Regulargroup)Externalevent(Injectedgroup)DataregisterEOC/JEOC…29ADCdualmodes(2/9)

InjectedsimultaneousmodeCH0CH1CH2CH3CH15CH13CH1CH2ConvertsaninjectedchannelgroupTheexternaltriggersource,whichstarttheconversion,comesfromADC1(simultaneoustriggerprovidedtoADC2)AnendofinjectedconversionisgeneratedattheendofallchannelsconversionResultsstoredoninjecteddataregistersofeachADC.Note:

DonotconvertthesamechannelonthetwoADCsADC2ADC1Injectedsimultaneousmodeon4injectedchannelsSamplingConversionTriggerforinjectedchannelsEndofInjectedConversiononADC1andADC230ADCdualmodes(3/9)

RegularsimultaneousmodeCH0CH1CH2CH3CH15CH14CH13CH12ConvertsaregularchannelgroupTheexternaltriggersource,whichstarttheconversion,comesfromADC1(simultaneoustriggerprovidedtoADC2)AnendofconversionisgeneratedattheendofallchannelsconversionResultsstoredonADC1regulardataregister(32bits)Note:

DonotconvertthesamechannelonthetwoADCsADC2ADC1Regularsimultaneousmodeon16regularchannelsSamplingConversionTriggerforregularchannelsEndofConversiononADC1andADC2……CH15CH031ADCdualmodes(4/9)

FastInterleavedmodeCH0CH0Convertsaregularchannelgroup(usuallyonechannel)Theexternaltriggersource,whichstarttheconversion,comesfromADC1:ADC2startsimmediatelyonADC1triggerADC1startsafteradelayof7ADCclockcyclesAnendofconversionisgeneratedattheendofallchannelsconversionResultsstoredonADC1regulardataregister(32bits)ADC2ADC1FastInterleavedmodeon1regularchannelincontinuousconversionmodeSamplingConversionTriggerforregularchannelsEndofConversiononADC17ADCCLKcycles……CH0CH0CH0CH0EndofConversiononADC2Note:-Themaximumsamplingtimeallowedislessthan7ADCclockcycles32ADCdualmodes(5/9)

SlowInterleavedmodeCH0CH0Convertsaregularchannelgroup(onlyonechannel)Theexternaltriggersource,whichstarttheconversion,comesfromADC1:ADC2startsimmediatelyonADC1triggerADC1startsafteradelayof14ADCclockcyclesAnendofconversionisgeneratedattheendofallchannelsconversionResultsstoredonADC1regulardataregister(32bits)AnewADC2startisautomaticallygeneratedafter28ADCclockcyclesNote:-Themaximumsamplingtimeallowedislessthan14ADCclockcycles-ContinuousconversionmodeisnotsupportedADC2ADC1SlowInterleavedmodeon1regularchannelSamplingConversionTriggerforregularchannelEndofConversiononADC114ADCCLKcyclesCH0CH028ADCCLKcyclesEndofConversiononADC133ADCdualmodes(6/9)

AlternateTriggermodeCH0ConvertsaninjectedchannelgroupTheexternaltriggersource,whichstarttheconversion,comesfromADC1(incaseofinjecteddiscontinuousmodeenabled):On1sttrigger,thefirstinjectedgroupchannelinADC1isconvertedOn2ndtrigger,thefirstinjectedgroupchannelinADC2isconvertedOn3rdtrigger,thesecondinjectedgroupchannelinADC1isconverted…AnendofinjectedconversionisgeneratedattheendofallchannelsconversionResultsstoredoninjecteddataregistersofeachADC.ADC1ADC2AlternateTriggermodeon4injectedchannels(injecteddiscontinuousmodeenabled)SamplingConversion2ndTriggerJEOConADC2CH11CH1CH12CH13CH2CH31stTrigger4thTrigger6thTrigger8thTrigger3rdTrigger5thTrigger7thTriggerCH10JEOConADC134ADCdualmodes(7/9)

CombinedRegular/Injectedsimultaneousmode

CH0CH1CH1CH2CH3CH2CH2CH1ConvertsaninjectedandaregularchannelsgroupsTheexternaltriggerssources,whichstarttheconversions,comesfromADC1(simultaneoustriggerprovidedtoADC2):injectedsimultaneousmodecaninterrupttheotheroneAnendofinjectedconversionisgeneratedattheendofallinjectedchannelsconversionandanendofconversionisgeneratedattheendofallregularchannelsResultsofinjectedchannelsstoredoninjecteddataregistersofeachADC,andregularchannelsonADC1dataregister(32bits)Note:

DonotconvertthesamechannelonthetwoADCsADC2ADC1CombinedRegular/Injectedsimultaneousmodeon4regularchannelsand2injectedchannelsSamplingConversionTriggerforregularchannelsEndofConversiononADC1andADC2CH10CH11CH15CH14ADC2ADC1TriggerforinjectedchannelsEndofInjectedConversiononADC1andADC2regularsimultaneousmodeinterruptedbyinjectedsimultaneousoneCH3CH035ADCdualmodes(8/9)

CombinedRegularsimultaneous+AlternateTriggermode

CH0CH1CH1CH3CH3CH2CH2CH0ConvertsaninjectedandregularchannelsgroupsTheexternaltriggerssources,whichstarttheconversions,comesfromADC1(simultaneoustriggerprovidedtoADC2):alternatetriggermodecaninterrupttheotheroneAnendofinjectedconversionisgeneratedattheendofallinjectedchannelsconversionandanendofconversionisgeneratedattheendofallregularchannelsResultsofinjectedchannelsstoredoninjecteddataregistersofeachADC,andregularchannelsonADC1dataregister(32bits)Note:

DonotconvertthesamechannelonthetwoADCsforregularsimultaneousmodeADC1ADC2CombinedRegula