rct6的DA生成三角波，不断改变值，但是波形却是电容充放电的波形不是标准的三角波,有谁测过吗？

吴海 · 发表于 2015-12-9 11:34:05

rct6的DA生成三角波，不断改变值，但是波形却是电容充放电的波形不是标准的三角波,有谁测过吗？

wuhanhongshanqu · 发表于 2015-12-9 12:10:22

源代码贴上来

吴海 · 发表于 2015-12-9 13:50:09

回复【2楼】wuhanhongshanqu:
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void Timerx_Init(u16 arr,u16 psc)
{
    TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

TIM_TimeBaseStructure.TIM_Period = arr; //?è???????????ü??????×°????????×?????×°???????÷???????? ??????5000??500ms
TIM_TimeBaseStructure.TIM_Prescaler =psc; //?è??????×÷??TIMx?±?????????????¤·?????  10Khz??????????
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //?è???±??·???:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIM?ò??????????
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //?ù??TIM_TimeBaseInitStruct?????¨????????????TIMx???±???ù??????

/* TIM IT enable */
TIM_ITConfig(  //?????ò???§?????¨??TIM????
TIM3, //TIM2
TIM_IT_Update  |  //TIM ??????
TIM_IT_Trigger,   //TIM ??·???????
ENABLE  //????
);
// TIM3->DIER&=0xfe;   //bu???í?ü??????
/* Enable the TIM3 global Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;  //TIM3????
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;  //??????????0??
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;  //????????3??
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ?¨??±?????
NVIC_Init(&NVIC_InitStructure);  //?ù??NVIC_InitStruct?????¨???????????????èNVIC?????÷

TIM_Cmd(TIM3, ENABLE);  //????TIMx???è

}
extern u16 dacval;
extern u16 flag;
void TIM3_IRQHandler(void)   //TIM3????
{

if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET) //?ì?é???¨??TIM????·??ú??·?:TIM ??????
{
      if(flag==0)
{
dacval+=4;
    DAC_SetChannel1Data(DAC_Align_12b_R,dacval);
if(dacval==4000) flag=1;
}
else
{
  dacval-=4;
     DAC_SetChannel1Data(DAC_Align_12b_R,dacval);
  if(dacval==0)  flag=0;
}

TIM_ClearITPendingBit(TIM3, TIM_IT_Update  );  //????TIMx???????????í??:TIM ??????
/*

in

D.02 toggling with frequency = 10KHz */
//GPIO_WriteBit(GPIOD, GPIO_Pin_2, (BitAction)(1 - GPIO_ReadOutputDataBit(GPIOD, GPIO_Pin_2)));
}
}