STM32 AD交替触发模式程序

简介：今天配置了STM32 AD的交替触发模式，采样基本做到1us一个样本了。通道10 1.5周期，使用交替模式，采样时间小于7.5 ADCclock 。

void Adc_Init(u16 period)

{

GPIO_InitTypeDef GPIO_InitStruct;

TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC,ENABLE);

GPIO_InitStruct.GPIO_Pin=GPIO_Pin_0;

GPIO_InitStruct.GPIO_Speed=GPIO_Speed_50MHz;

GPIO_InitStruct.GPIO_Mode=GPIO_Mode_AIN;

GPIO_Init(GPIOC,&GPIO_InitStruct);

RCC->APB2ENR|=1<<9; //ADC1时钟使能

RCC->APB2ENR|=1<<10; //ADC2时钟使能

RCC->APB2RSTR|=1<<9; //ADC1复位

RCC->APB2RSTR&=~(1<<9);//复位结束

RCC->APB2RSTR|=1<<10; //ADC2复位

RCC->APB2RSTR&=~(1<<10);//复位结束

RCC->CFGR&=~(3<<14); //分频因子清零

RCC->CFGR|=2<<14; //SYSCLK/DIV2=12M ADC时钟设置为12M,ADC最大时钟不能超过14M!

ADC1->CR1=0x00070000;

ADC1->CR2=0x00180100;

ADC1->SQR3=0x0000000A;

ADC1->SMPR1=0x00000000;

ADC1->SMPR2=0x00000000;

ADC2->CR1=0x00000000;

ADC2->CR2=0x00180100;

ADC2->SQR3=0x0000000A;

ADC2->SMPR1=0x00000000; //通道10 1.5周期，使用交替模式，采样时间小于7.5 ADCclock

ADC2->SMPR2=0x00000000;

ADC1_DMA_Config((u32)&(ADC_conver),320);

ADC1->CR2|=1<<0; //开启AD转换器

ADC1->CR2|=1<<3; //使能复位校准

while(ADC1->CR2&1<<3); //等待校准结束

ADC1->CR2|=1<<2; //开启AD校准

while(ADC1->CR2&1<<2); //等待校准结束

ADC2->CR2|=1<<0; //开启AD转换器

ADC2->CR2|=1<<3; //使能复位校准

while(ADC2->CR2&1<<3); //等待校准结束

ADC2->CR2|=1<<2; //开启AD校准

while(ADC2->CR2&1<<2); //等待校准结束

TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);

TIM_TimeBaseStructure.TIM_Period =period-1; //计数器值

TIM_TimeBaseStructure.TIM_Prescaler =0;//预分频值，1分频

TIM_TimeBaseStructure.TIM_ClockDivision =0x0; //采样分频72mhz

TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上计数

TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);//初始化定时器结构体

TIM_SelectOutputTrigger(TIM3, TIM_TRGOSource_Update);

TIM_Cmd(TIM3,ENABLE);

}

void ADC1_DMA_Config(u32 MemoryAddress,u16 num)

{

DMA_InitTypeDef DMA_InitStructure;

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1,ENABLE);

DMA_DeInit(DMA1_Channel1);

DMA_InitStructure.DMA_PeripheralBaseAddr=0x40012400+0x4c;

DMA_InitStructure.DMA_MemoryBaseAddr=MemoryAddress;

DMA_InitStructure.DMA_DIR=DMA_DIR_PeripheralSRC;

DMA_InitStructure.DMA_BufferSize=num;

DMA_InitStructure.DMA_M2M=DMA_M2M_Disable;

DMA_InitStructure.DMA_Priority=DMA_Priority_VeryHigh;

DMA_InitStructure.DMA_PeripheralDataSize=DMA_PeripheralDataSize_Word;

DMA_InitStructure.DMA_MemoryDataSize=DMA_MemoryDataSize_Word;

DMA_InitStructure.DMA_PeripheralInc=DMA_PeripheralInc_Disable;

DMA_InitStructure.DMA_MemoryInc=DMA_MemoryInc_Enable;

DMA_InitStructure.DMA_Mode=DMA_Mode_Circular;

DMA_Init(DMA1_Channel1,&DMA_InitStructure);

DMA_Cmd(DMA1_Channel1 ,ENABLE);

}

50k时的波形

100k时

10k时