2018年10月06日 | STM32F407ADC多通道+定时器触发+DMA模式设置

#include "adc.h"

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

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     

}

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    

}

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

}

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);

}

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    

}

void ADCInit(void)

{

    ADCInit_GPIO();

    ADCInit_DMA();

    ADCInit_ADC();

    ADCInit_Nvic();

    DebugLog("ADC Init is finish.");

}    

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  

}

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  

}