ADC采集正弦波，DAM采用循环模式和一般模式数据不对

只看该作者 · 2020-3-15 11:31

本帖最后由 1769731564 于 2020-3-15 11:33 编辑

什么原因呢
程序：
void TIM_Init()
{
TIM_TimeBaseInitTypeDef    TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
GPIO_InitTypeDef GPIO_InitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);

// GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_9 ;
// GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
// GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
// GPIO_Init(GPIOB, &GPIO_InitStructure);

TIM_TimeBaseStructure.TIM_Period = 600-1;       //µ±¶¨Ê±Æ÷´Ó0¼ÆÊýµ½255£¬¼´Îª266´Î£¬ÎªÒ»¸ö¶¨Ê±ÖÜÆÚ
TIM_TimeBaseStructure.TIM_Prescaler =0;         //ÉèÖÃÔ¤·ÖÆµ£º
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1 ; //ÉèÖÃÊ±ÖÓ·ÖÆµÏµÊý£º²»·ÖÆµ(ÕâÀïÓÃ²»µ½)
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;    //ÏòÉÏ¼ÆÊýÄ£Ê½
TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 100;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;

TIM_OC4Init(TIM4, &TIM_OCInitStructure);
TIM_OC4PreloadConfig(TIM4, TIM_OCPreload_Enable);

TIM_ARRPreloadConfig(TIM4, ENABLE);
TIM_Cmd(TIM4, ENABLE);
}

void DMA_init(void)
{
DMA_InitTypeDef  DMA_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

DMA_DeInit(DMA1_Channel1);
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)(&( ADC1->DR ));      //ADCµØÖ·
DMA_InitStructure.DMA_MemoryBaseAddr = (u32)ADC1_Buf; //ÄÚ´æµØÖ·
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize = 256;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //ÍâÉèµØÖ·¹Ì¶¨
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;    //ÄÚ´æµØÖ·¹Ì¶¨
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word; //°ë×Ö
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word;
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; //Ñ»·´«Êä
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel1, &DMA_InitStructure);
DMA_Cmd(DMA1_Channel1, ENABLE);

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_ITConfig(DMA1_Channel1, DMA_IT_TC , ENABLE);    //¿ªÆô×ª»»Íê³ÉÖÐ¶Ï
}
void ADC_Configuration(void)
{