热度 12
2014-3-1 10:59
7727 次阅读|
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最近需要用到两个ADC对电压电流进行同步采样,看了一下STM32的ADC介绍,发现STM32最多有3个独立ADC,有在双AD模式下可以进行同步测量,正好满足我的要求。参考官方给的例子在结合自己的需要写了一下配置程序。 程序1 根据官方例子写的: #include"adc.h" __IO uint32_t ADC_DualConvertedValueTab ; void ADC1_2_Init(void) { ADC_InitTypeDef ADC_InitStructure; DMA_InitTypeDef DMA_InitStructure; GPIO_InitTypeDef GPIO_InitStructure; RCC_ADCCLKConfig(RCC_PCLK2_Div4); RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1 | RCC_APB2Periph_ADC2 | RCC_APB2Periph_GPIOA, ENABLE); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1 | GPIO_Pin_4; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; GPIO_Init(GPIOA, GPIO_InitStructure); DMA_DeInit(DMA1_Channel1); //DMA通道1恢复到默认状态 DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_Address; //设置数据来源地址 DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)ADC_DualConvertedValueTab; //设置copy目标地址 DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; //设置copy方向 DMA_InitStructure.DMA_BufferSize = 16; //设置数组大小 DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //数据来源不变 DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //数据保存的数组地址自增 DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word; //DMA操作字长 32位 DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word; //DMA操作字长 32位 DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; //普通的DMA操作模式:当DMA操作转移够 数组大小 //所限定的数据总量后,则不再进行DMA操作 DMA_InitStructure.DMA_Priority = DMA_Priority_High; //DMA优先级 DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; //关闭mTM DMA_Init(DMA1_Channel1, DMA_InitStructure); //使能dma /* Enable DMA1 Channel1 */ DMA_Cmd(DMA1_Channel1, ENABLE); /* ADC1 configuration ------------------------------------------------------*/ ADC_InitStructure.ADC_Mode = ADC_Mode_RegSimult; //ADC1同步规则组模式 ADC_InitStructure.ADC_ScanConvMode = ENABLE; //启动扫描 ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; //连续转换 ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None; //无外部触发 ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //结果右对齐 ADC_InitStructure.ADC_NbrOfChannel = 1; //转换通道数2 ADC_Init(ADC1, ADC_InitStructure); //配置ADC1 /* ADC1 regular channels configuration */ ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 1, ADC_SampleTime_239Cycles5); //通道配置 /* Enable ADC1 DMA */ ADC_DMACmd(ADC1, ENABLE); /* ADC2 configuration ------------------------------------------------------*/ ADC_InitStructure.ADC_Mode = ADC_Mode_RegSimult; //ADC2同步规则组模式 ADC_InitStructure.ADC_ScanConvMode = ENABLE; //启动扫描 ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; //连续转换 ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None; //无外部触发 ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //结果右对齐 ADC_InitStructure.ADC_NbrOfChannel = 1; //转换通道数 ADC_Init(ADC2, ADC_InitStructure); //配置ADC2 /* ADC2 regular channels configuration */ ADC_RegularChannelConfig(ADC2, ADC_Channel_4, 1, ADC_SampleTime_239Cycles5); //通道配置 /* Enable ADC2 external trigger conversion */ ADC_ExternalTrigConvCmd(ADC2, ENABLE); //使能ADC2的外部触发模式 /* Enable ADC1 */ ADC_Cmd(ADC1, ENABLE); //使能ADC1 /* Enable Vrefint channel17 */ // ADC_TempSensorVrefintCmd(ENABLE); // 使能温度传感器内部参考电压通道 /* Enable ADC1 reset calibration register */ ADC_ResetCalibration(ADC1); //ADC1的校准 /* Check the end of ADC1 reset calibration register */ while(ADC_GetResetCalibrationStatus(ADC1)); /* Start ADC1 calibration */ ADC_StartCalibration(ADC1); /* Check the end of ADC1 calibration */ while(ADC_GetCalibrationStatus(ADC1)); /* Enable ADC2 */ ADC_Cmd(ADC2, ENABLE); //使能ADC2 /* Enable ADC2 reset calibration register */ ADC_ResetCalibration(ADC2); //ADC2的校准 /* Check the end of ADC2 reset calibration register */ while(ADC_GetResetCalibrationStatus(ADC2)); /* Start ADC2 calibration */ ADC_StartCalibration(ADC2); /* Check the end of ADC2 calibration */ while(ADC_GetCalibrationStatus(ADC2)); /* Start ADC1 Software Conversion */ //软件启动ADC1,开始转换 ADC_SoftwareStartConvCmd(ADC1, ENABLE); /* Test on DMA1 channel1 transfer complete flag */ //等待一组DMA存储转换完成 while(!DMA_GetFlagStatus(DMA1_FLAG_TC1)); /* Clear DMA1 channel1 transfer complete flag */ DMA_ClearFlag(DMA1_FLAG_TC1); DMA_Done = 1; } 两个ADC采出来的数据存在32位数组ADC_DualConvertedValueTab 中,其中ADC1对应低16位,ADC2对应高16位。可通过以下程序读出: uint16_t adc1_val ; uint16_t adc2_val ; for(i=0;i1000;i++) { adc1_val = ADC_DualConvertedValueTab ; adc2_val = ADC_DualConvertedValueTab 16; } 最后再附上自己写的用TIM3触发采样的程序,可以自己调用来设置采样率。 程序2: void ADC1_2_Config(u16 SampleFreq,u16 DMA_BufferSizer) { ADC_InitTypeDef ADC_InitStructure; DMA_InitTypeDef DMA_InitStructure; GPIO_InitTypeDef GPIO_InitStructure; TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; NVIC_InitTypeDef NVIC_InitStructure; RCC_ADCCLKConfig(RCC_PCLK2_Div2); RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1 | RCC_APB2Periph_ADC2, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1 | GPIO_Pin_4; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; GPIO_Init(GPIOA, GPIO_InitStructure); //定时器3控制采样率 TIM_TimeBaseStructure.TIM_Prescaler= 0; TIM_TimeBaseStructure.TIM_CounterMode= TIM_CounterMode_Up; TIM_TimeBaseStructure.TIM_Period= 72000000 / SampleFreq - 1; TIM_TimeBaseStructure.TIM_ClockDivision= 0; TIM_TimeBaseStructure.TIM_RepetitionCounter = 0; TIM_TimeBaseInit( TIM3, TIM_TimeBaseStructure); TIM_SelectOutputTrigger( TIM3, TIM_TRGOSource_Update ); TIM_ARRPreloadConfig(TIM3,ENABLE); TIM_Cmd( TIM3, ENABLE ); DMA_DeInit(DMA1_Channel1); //DMA通道1恢复到默认状态 DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_Address; //设置数据来源地址 DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)ADC_DualConvertedValueTab; //设置copy目标地址 DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; //设置copy方向 DMA_InitStructure.DMA_BufferSize = ADC_BufferLength; //设置数组大小 DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //数据来源不变 DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //数据保存的数组地址自增 DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word; //DMA操作字长 32位 DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word; //DMA操作字长 32位 DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; //普通的DMA操作模式:当DMA操作转移够 数组大小 //所限定的数据总量后,则不再进行DMA操作 DMA_InitStructure.DMA_Priority = DMA_Priority_High; //DMA优先级 DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; //关闭mTM DMA_Init(DMA1_Channel1, DMA_InitStructure); //使能dma /* Enable DMA1 Channel1 */ DMA_Cmd(DMA1_Channel1, ENABLE); /* DMA Transfer Complete Interrupt enable */ NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel1_IRQn; //通道 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1; //占先级 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //响应级 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //启动 NVIC_Init(NVIC_InitStructure); //初始化 DMA_ITConfig(DMA1_Channel1,DMA_IT_TC,ENABLE); /* ADC1 configuration ------------------------------------------------------*/ ADC_InitStructure.ADC_Mode = ADC_Mode_RegSimult; //ADC1同步规则组模式 ADC_InitStructure.ADC_ScanConvMode = ENABLE; //启动扫描 ADC_InitStructure.ADC_ContinuousConvMode = DISABLE; //连续转换 ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T3_TRGO; //无外部触发 ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //结果右对齐 ADC_InitStructure.ADC_NbrOfChannel = 1; //转换通道数2 ADC_Init(ADC1, ADC_InitStructure); //配置ADC1 /* ADC1 regular channels configuration */ ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 1, ADC_SampleTime_28Cycles5); //通道配置 /* Enable ADC1 DMA */ ADC_DMACmd(ADC1, ENABLE); /* ADC2 configuration ------------------------------------------------------*/ ADC_InitStructure.ADC_Mode = ADC_Mode_RegSimult; //ADC2同步规则组模式 ADC_InitStructure.ADC_ScanConvMode = ENABLE; //启动扫描 ADC_InitStructure.ADC_ContinuousConvMode = DISABLE; //连续转换 ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None; //无外部触发 ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //结果右对齐 ADC_InitStructure.ADC_NbrOfChannel = 1; //转换通道数 ADC_Init(ADC2, ADC_InitStructure); //配置ADC2 /* ADC2 regular channels configuration */ ADC_RegularChannelConfig(ADC2, ADC_Channel_4, 1, ADC_SampleTime_28Cycles5); //通道配置 /* Enable ADC2 external trigger conversion */ ADC_ExternalTrigConvCmd(ADC2, ENABLE); //使能ADC2的外部触发模式 /* Enable ADC1 */ ADC_Cmd(ADC1, ENABLE); //使能ADC1 /* Enable Vrefint channel17 */ // ADC_TempSensorVrefintCmd(ENABLE); // 使能温度传感器内部参考电压通道 /* Enable ADC1 reset calibration register */ ADC_ResetCalibration(ADC1); //ADC1的校准 /* Check the end of ADC1 reset calibration register */ while(ADC_GetResetCalibrationStatus(ADC1)); /* Start ADC1 calibration */ ADC_StartCalibration(ADC1); /* Check the end of ADC1 calibration */ while(ADC_GetCalibrationStatus(ADC1)); /* Enable ADC2 */ ADC_Cmd(ADC2, ENABLE); //使能ADC2 /* Enable ADC2 reset calibration register */ ADC_ResetCalibration(ADC2); //ADC2的校准 /* Check the end of ADC2 reset calibration register */ while(ADC_GetResetCalibrationStatus(ADC2)); /* Start ADC2 calibration */ ADC_StartCalibration(ADC2); /* Check the end of ADC2 calibration */ while(ADC_GetCalibrationStatus(ADC2)); /* Start ADC1 Software Conversion */ //软件启动ADC1,开始转换 ADC_SoftwareStartConvCmd(ADC1, ENABLE); // while(!DMA_GetFlagStatus(DMA1_FLAG_TC1)); // /* Clear DMA1 channel1 transfer complete flag */ // DMA_ClearFlag(DMA1_FLAG_TC1); // DMA_Done = 1; } void DMA1_Channel1_IRQHandler(void) { if(DMA_GetITStatus(DMA1_IT_TC1) != RESET) { DMA_ClearITPendingBit(DMA1_IT_TC1); DMA_ITConfig(DMA1_Channel1,DMA_IT_TC,DISABLE); ADC_Cmd(ADC1,DISABLE); ADC_Cmd(ADC2,DISABLE); DMA_Done =1; } } 调用方式:ADC1_2_Config(5120,512); 可以用作FFT分析前的采样。