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采用stm32f1開(kāi)發(fā)板，使用ADC的定時(shí)器觸發(fā)ADC轉(zhuǎn)換的功能，然后使用DMA進(jìn)行數(shù)據(jù)的搬運(yùn)。采用TIM2定時(shí)器的觸發(fā)間隔，實(shí)現(xiàn)ADC定時(shí)采樣轉(zhuǎn)換的功能，然后可以在程序的死循環(huán)中一直檢測(cè)DMA轉(zhuǎn)換完成標(biāo)志，然后進(jìn)行數(shù)據(jù)的讀取，或者使能DMA轉(zhuǎn)換完成中斷，這樣每次轉(zhuǎn)換完成就會(huì)產(chǎn)生中斷。
## 定時(shí)器2初始化函數(shù)
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
TIM_TimeBaseStructure.TIM_Period = arr; //設(shè)置在下一個(gè)更新事件裝入活動(dòng)的自動(dòng)重裝載寄存器周期的值
TIM_TimeBaseStructure.TIM_Prescaler =psc; //設(shè)置用來(lái)作為T(mén)IMx時(shí)鐘頻率除數(shù)的預(yù)分頻值
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //設(shè)置時(shí)鐘分割:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上計(jì)數(shù)模式
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure); //根據(jù)指定的參數(shù)初始化TIMx的時(shí)間基數(shù)單位
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //選擇定時(shí)器模式:TIM脈沖寬度調(diào)制模式1
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比較輸出使能
TIM_OCInitStructure.TIM_Pulse = 1000;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //輸出極性:TIM輸出比較極性低
TIM_OC2Init(TIM2, & TIM_OCInitStructure); //初始化外設(shè)TIM2_CH2
TIM_Cmd(TIM2, ENABLE); //使能TIMx
TIM_CtrlPWMOutputs(TIM2, ENABLE);
## DMA配置
DMA_InitTypeDef DMA_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1,ENABLE); //使能ADC1通道時(shí)鐘
DMA_DeInit(DMA1_Channel1);
DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address; //ADC1地址
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&ADC_ConvertedValue; //內(nèi)存地址
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; //方向(從外設(shè)到內(nèi)存)
DMA_InitStructure.DMA_BufferSize = 1; //傳輸內(nèi)容的大小
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外設(shè)地址固定
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable; //內(nèi)存地址固定
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord ; //外設(shè)數(shù)據(jù)單位
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord ; //內(nèi)存數(shù)據(jù)單位
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular ; //DMA模式：循環(huán)傳輸
DMA_InitStructure.DMA_Priority = DMA_Priority_High ; //優(yōu)先級(jí)：高
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; //禁止內(nèi)存到內(nèi)存的傳輸
DMA_Init(DMA1_Channel1, &DMA_InitStructure); //配置DMA1
DMA_ITConfig(DMA1_Channel1,DMA_IT_TC, ENABLE); //使能傳輸完成中斷
NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
DMA_Cmd(DMA1_Channel1,ENABLE);
## GPIO配置
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //使能GPIOA時(shí)鐘
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOA, &GPIO_InitStructure);
## ADC初始化
ADC_InitTypeDef ADC_InitStructure;
TIM2_Init(30000,7199); //72000000/7200=10000Hz，每3s采集一次
DMA1_Init();
ADC_GPIO_Configuration();
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE); //使能ADC1通道時(shí)鐘
ADC_InitStructure.ADC_Mode = ADC_Mode_Independent; //獨(dú)立ADC模式
ADC_InitStructure.ADC_ScanConvMode = DISABLE; //關(guān)閉掃描方式
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE; //關(guān)閉連續(xù)轉(zhuǎn)換模式
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T2_CC2; //使用外部觸發(fā)模式
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //采集數(shù)據(jù)右對(duì)齊
ADC_InitStructure.ADC_NbrOfChannel = 1; //要轉(zhuǎn)換的通道數(shù)目
ADC_Init(ADC1, &ADC_InitStructure);
## 注意事項(xiàng)
一定要在程序最前面定義ADC的采樣數(shù)據(jù)和地址
volatile uint16_t ADC_ConvertedValue; //ADC采樣的數(shù)據(jù)
#define ADC1_DR_Address ((u32)0x4001244C) //ADC1的地址
全部資料51hei下載地址：
定時(shí)器觸發(fā)ADC實(shí)驗(yàn).7z
(221.91 KB, 下載次數(shù): 48)
2020-6-4 21:00 上傳
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