原文地址：https://www.cnblogs.com/longbiao831/p/6688006.html
#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
}
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