STM32F407ADC多通道+定时器触发+DMA模式设置
#include "adc.h" /* 数据定义 */ u8 UpdataTIM = 0; //更新TIM2定时器标志 u16 CurrentFreq = 500;//默认市电频率,单位为0.1hz ADBASE_TYPE uAD_Buff_A[ADC_CHANNEL]; //ADC采集缓存A ADBASE_TYPE uAD_Buff_B[ADC_CHANNEL]; //ADC采集缓存B //考虑到可能出现的数据处理时间较长的问题,临时添加缓存 //u16 uAD_IN_BUFF[ADC_BUFFSIZE][ADC_CHANNEL]; ADBASE_TYPE *CurrentBuffPtr = NULL; //当前缓存指针 /* * Function : static void ADCInit_GPIO(void) * Description : ADCGPIO初始化 * Arguments : 无 * Returns : 无 * Other : */ static void ADCInit_GPIO(void) { GPIO_InitTypeDef GPIO_InitStructure; RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOF, ENABLE);//使能GPIOF时钟 //ADC通道初始化 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7|GPIO_Pin_8| \ GPIO_Pin_9|GPIO_Pin_10; //PF3,PF4,PF5,PF6,PF7,PF8,PF9,PF10 ADC通道 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN; //模拟输入 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; //不带上下拉 GPIO_Init(GPIOF, &GPIO_InitStructure); //初始化 } /* * Function : static void ADCInit_ADC(void) * Description : ADC模式初始化 * Arguments : 无 * Returns : 无 * Other : */ static void ADCInit_ADC(void) { ADC_CommonInitTypeDef ADC_CommonInitStructure; ADC_InitTypeDef ADC_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC3, ENABLE); //使能ADC3时钟 RCC_APB2PeriphResetCmd(RCC_APB2Periph_ADC3,ENABLE); //ADC3复位 RCC_APB2PeriphResetCmd(RCC_APB2Periph_ADC3,DISABLE); //复位结束 ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;//独立模式 ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles; //两个采样阶段之间的延迟5个时钟(三重模式或双重模式下使用) ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled; //DMA失能(对于多个ADC模式) 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;//扫描模式(多通道ADC采集要用扫描模式) ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;//关闭连续转换 // ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None; //软件触发 ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_Rising; //上升沿触发 ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T2_TRGO; //定时器事件2触发ADC ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;//右对齐 ADC_InitStructure.ADC_NbrOfConversion = ADC_CHANNEL; //8个转换在规则序列中 ADC_Init(ADC3, &ADC_InitStructure);//ADC初始化 //连续模式下,通道的配置 ADC_RegularChannelConfig(ADC3, ADC_Channel_9, 1, ADC_SampleTime_15Cycles); //PF3,VIN1,通道9,UA,rank=1,表示连续转换中第一个转换的通道,采样时间15个周期(如果数据不稳定可以延时采样时间) ADC_RegularChannelConfig(ADC3, ADC_Channel_14, 2, ADC_SampleTime_15Cycles); //PF4,VIN2,通道14,UB ADC_RegularChannelConfig(ADC3, ADC_Channel_15, 3, ADC_SampleTime_15Cycles); //PF5,VIN3,通道15,AC220 ADC_RegularChannelConfig(ADC3, ADC_Channel_4, 4, ADC_SampleTime_15Cycles); //PF6,VIN4,通道4,I0 ADC_RegularChannelConfig(ADC3, ADC_Channel_5, 5, ADC_SampleTime_15Cycles); //PF7,VIN5,通道5,IA ADC_RegularChannelConfig(ADC3, ADC_Channel_6, 6, ADC_SampleTime_15Cycles); //PF8,VIN6,通道6,IB ADC_RegularChannelConfig(ADC3, ADC_Channel_7, 7, ADC_SampleTime_15Cycles); //PF9,VIN7,通道7,IC ADC_RegularChannelConfig(ADC3, ADC_Channel_8, 8, ADC_SampleTime_15Cycles); //PF10,VIN8,通道8,暂时未接入信号 ADC_DMARequestAfterLastTransferCmd(ADC3, ENABLE); //连续使能DMA ADC_DMACmd(ADC3, ENABLE); //使能ADC_DMA ADC_Cmd(ADC3, ENABLE);//开启AD转换器 } /* * Function : static void ADCInit_DMA(void) * Description : ADC使能DMA模式 * Arguments : 无 * Returns : 无 * Other : */ static void ADCInit_DMA(void) { DMA_InitTypeDef DMA_InitStructure; //时钟 RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE); //DMA设置 DMA_InitStructure.DMA_Channel = DMA_Channel_2; //选择通道号 DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&(ADC3->DR); //外围设备地址,ADC_DR_DATA规则数据寄存器 DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)(u16 *)uAD_Buff_A; //DMA存储器地址,自己设置的缓存地址 DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory; //传输方向,外设->存储器 DMA_InitStructure.DMA_BufferSize = ADC_BUFFSIZE * ADC_CHANNEL; //DMA缓存大小,数据传输量32*8 DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外设是否为增量模式 DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //存储器是否为增量模式 DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; //外设数据长度半个字(16位) DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; //存储器数据长度半字(16位) DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; //DMA模式,普通模式、循环模式,还有双缓冲模式,需要特殊设置 DMA_InitStructure.DMA_Priority = DMA_Priority_High; //DMA优先级,高优先级 DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable; //不使用FIFO DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull; //FIFO阈值 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(DMA2_Stream0, &DMA_InitStructure); //初始化DMA2_Stream0,对应为ADC3 //双缓冲模式设置 DMA_DoubleBufferModeConfig(DMA2_Stream0,(uint32_t)(u16 *)(uAD_Buff_B),DMA_Memory_0); //DMA_Memory_0首先被传输 DMA_DoubleBufferModeCmd(DMA2_Stream0,ENABLE); //设置DMA中断 DMA_ClearITPendingBit(DMA2_Stream0, DMA_IT_TC); //清除中断标志 DMA_ITConfig(DMA2_Stream0, DMA_IT_TC, ENABLE); //传输完成中断 DMA_Cmd(DMA2_Stream0, ENABLE); //使能DMA } /* * Function : void ADCInit_Timer(void) * Description : ADC触发定时器的设置 * Arguments : 无 * Returns : 无 * Other : */ void ADCInit_Timer(void) { TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; //时钟 RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); //失能定时器 TIM_Cmd(TIM2, DISABLE); TIM_TimeBaseStructInit(&TIM_TimeBaseStructure); //初始化定时器 //定时器设置,T=(84 * 625) / 84M = 625us = 20ms/32,50Hz信号,每周期采样32个点,采样频率1600 TIM_TimeBaseStructure.TIM_Prescaler = 84-1; //分频系数,TIM2时钟在分频系数不为1时,时钟是APB1时钟的两倍84M TIM_TimeBaseStructure.TIM_Period = 312500/CurrentFreq - 1; //周期值1M/32=31250,CurrentFreq单位为0.1hz,因此需扩大10倍 TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //时钟分频因子 TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up ; //向上计数模式 TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure); //初始化定时器2 //使能定时器中断 TIM_ARRPreloadConfig(TIM2, ENABLE); //允许TIM2定时重载 TIM_SelectOutputTrigger(TIM2, TIM_TRGOSource_Update); //选择TIM2的UPDATA事件更新为触发源 // TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE); //配置TIM2中断类型 //使能TIM2 TIM_Cmd(TIM2, ENABLE); DebugLog("Enable TIM2, Set frequency is %d.", CurrentFreq); } /* * Function : void ADCInit_Nvic(void) * Description : 中断初始化 * Arguments : 无 * Returns : 无 * Other : */ static void ADCInit_Nvic(void) { NVIC_InitTypeDef NVIC_InitStructure; //定时器中断设置 NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn; //定时器TIM2中断通道 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1; //抢占优先级0 NVIC_InitStructure.NVIC_IRQChannelSubPriority =1; //子优先级1 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能 NVIC_Init(&NVIC_InitStructure); //根据指定的参数初始化NVIC寄存器 //DMA中断设置 NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream0_IRQn; //DMA2_Stream0中断 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0; //抢占优先级1 NVIC_InitStructure.NVIC_IRQChannelSubPriority =1; //子优先级1 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能 NVIC_Init(&NVIC_InitStructure); //根据指定的参数初始化NVIC寄存器 } /* * Function : void ADCInit(void) * Description : ADC初始化函 * Arguments : 无 * Returns : 无 * Other : */ void ADCInit(void) { ADCInit_GPIO(); ADCInit_DMA(); ADCInit_ADC(); ADCInit_Nvic(); DebugLog("ADC Init is finish."); } /* * Function : void TIM2_IRQHandler(void) * Description : TIM2中断触发函数 * Arguments : 无 * Returns : 无 * Other : */ void TIM2_IRQHandler(void) { OSIntEnter(); //进入中断 if(TIM_GetITStatus(TIM2, TIM_IT_Update)) //判断发生update事件中断 { TIM_ClearITPendingBit(TIM2, TIM_IT_Update); //清除update事件中断标志 // ADC_SoftwareStartConv(ADC1); } OSIntExit(); //退出中断 } /* * Function : void DMA2_Stream0_IRQHandler(void) * Description : DMA2_Stream0中断 * Arguments : 无 * Returns : 无 * Other : */ void DMA2_Stream0_IRQHandler(void) { u16 period = 0; OSIntEnter(); //进入中断 if(DMA_GetITStatus(DMA2_Stream0, DMA_IT_TCIF0)) //判断DMA传输完成中断 { DMA_ClearITPendingBit(DMA2_Stream0, DMA_IT_TCIF0); // DMA_Cmd(DMA2_Stream0, ENABLE); //使能DMA,连续模式下不需要该使能 //数据转移程序 if(DMA_GetCurrentMemoryTarget(DMA2_Stream0) == DMA_Memory_0) { CurrentBuffPtr = uAD_Buff_A; } else { CurrentBuffPtr = uAD_Buff_B; } //遥测任务等待该信号量 OSSemPost(SemAD); //判断是否更新TIM2 if(UpdataTIM) { period = 312500/CurrentFreq - 1; //计算采样频率1M/32=31250;32为采样点数,31250/freq=采样周期 TIM_ARRPreloadConfig(TIM2, DISABLE); //关闭TIM2定时重载 TIM2->ARR = period ; //更新定时器周期 TIM_ARRPreloadConfig(TIM2, ENABLE); //打开TIM2定时重载 } } OSIntExit(); //退出中断 }
另外还是双缓存机制，代码已经注释的很清楚了，以后有问题了可以再回过头来看看。
