AD采集区段出现0

橙One · 发表于 2018-5-16 13:46:39

用STM32F103C8T6的AD采集处理音频信号，在我不对麦克风说话时一切正常，对着发出声音后间接的有0出现找不出是什么问题
[mw_shl_code=c,true]int q,h,z;
   u8 tmp_buf[4],i;
void TIME_INIT(void)
{
  TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
  TIM_OCInitTypeDef  TIM_OCInitStructure;
GPIO_InitTypeDef GPIO_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE); //ê±Öóê1Äü

  TIM_DeInit(TIM1);
  TIM_OCStructInit(&TIM_OCInitStructure);
  TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
  GPIO_StructInit(&GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  TIM_TimeBaseStructure.TIM_Prescaler = 0x00;
  TIM_TimeBaseStructure.TIM_Period = 0x3FF;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
  TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);

  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
  TIM_OCInitStructure.TIM_Pulse = 0x200;
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
  TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
  TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
  TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
  TIM_OC1Init(TIM1, &TIM_OCInitStructure);

  TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);
  TIM_ARRPreloadConfig(TIM1, ENABLE);
TIM_Cmd(TIM1, ENABLE);
  TIM_CtrlPWMOutputs(TIM1, ENABLE);

}

//í¨óÃ¶¨ê±Æ÷3ÖD¶Ï3õê¼»ˉ
//Õaàïê±ÖóÑ¡ÔñÎaAPB1μÄ2±¶￡¬¶øAPB1Îa36M
//arr￡o×Ô¶ˉÖØ×°Öμ¡￡
//psc￡oê±ÖóÔ¤·ÖÆμêy
//Õaàïê1óÃμÄêÇ¶¨ê±Æ÷3!
void TIM3_Int_Init(u16 arr,u16 psc)
{
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //ê±Öóê1Äü

//¶¨ê±Æ÷TIM33õê¼»ˉ
TIM_TimeBaseStructure.TIM_Period = arr; //éèÖÃÔúÏÂò»¸ö¸üDÂêÂ¼t×°èë»î¶ˉμÄ×Ô¶ˉÖØ×°ÔØ¼Ä′æÆ÷ÖüÆúμÄÖμ
TIM_TimeBaseStructure.TIM_Prescaler =psc; //éèÖÃóÃà′×÷ÎaTIMxê±ÖóÆμÂê3yêyμÄÔ¤·ÖÆμÖμ
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //éèÖÃê±Öó·Ö¸î:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIMÏòéÏ¼ÆêyÄ￡ê½
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //¸ù¾YÖ¸¶¨μÄ2Îêy3õê¼»ˉTIMxμÄê±¼ä»ùêyμ￥Î»

TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE ); //ê1ÄüÖ¸¶¨μÄTIM3ÖD¶Ï,ÔêDí¸üDÂÖD¶Ï

//ÖD¶ÏóÅÏè¼¶NVICéèÖÃ
NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;  //TIM3ÖD¶Ï
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;  //ÏèÕ¼óÅÏè¼¶0¼¶
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;  //′óóÅÏè¼¶3¼¶
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQí¨μà±»ê1Äü
NVIC_Init(&NVIC_InitStructure);  //3õê¼»ˉNVIC¼Ä′æÆ÷

TIM_Cmd(TIM3, ENABLE);  //ê1ÄüTIMx
TIME_INIT();
}
//¶¨ê±Æ÷3ÖD¶Ï·tÎñ3ìDò
void TIM3_IRQHandler(void) //TIM3ÖD¶Ï
{

if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET)  //¼ì2éTIM3¸üDÂÖD¶Ï·￠éúóë·ñ
{

TIM_ClearITPendingBit(TIM3, TIM_IT_Update);  //Çå3yTIMx¸üDÂÖD¶Ï±êÖ¾

z=Get_Adc(1);
   // printf("%d\r\n",z);
q=z/100;
h=z%100;

tmp_buf[0]=q;
tmp_buf[1]=h;
printf("%d\r\n",q*100+h);
//NRF24L01_TxPacket(tmp_buf);
// printf("%d%d\r\n",tmp_buf[0],tmp_buf[1]);
// TIM1->CCR1 =z; //PWMêä3ö

}
}

[/mw_shl_code]

ADC的初始化
[mw_shl_code=c,true]void  Adc_Init(void)
{
ADC_InitTypeDef ADC_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA |RCC_APB2Periph_ADC1 , ENABLE );    //ê1ÄüADC1í¨μàê±Öó

RCC_ADCCLKConfig(RCC_PCLK2_Div6); //éèÖÃADC·ÖÆμòò×ó6 72M/6=12,ADC×î′óê±¼ä2»Äü3¬1y14M

//PA1 ×÷ÎaÄ￡Äaí¨μàêäèëòy½Å
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; //Ä￡Äaêäèëòy½Å
GPIO_Init(GPIOA, &GPIO_InitStructure);

ADC_DeInit(ADC1);  //¸′Î»ADC1

ADC_InitStructure.ADC_Mode = ADC_Mode_Independent; //ADC1¤×÷Ä￡ê½:ADC1oíADC21¤×÷Ôú¶àá￠Ä￡ê½
ADC_InitStructure.ADC_ScanConvMode = DISABLE; //Ä￡êy×a»»1¤×÷Ôúμ￥í¨μàÄ￡ê½
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE; //Ä￡êy×a»»1¤×÷Ôúμ￥′Î×a»»Ä￡ê½
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None; //×a»»óéèí¼t¶ø2»êÇía2¿′￥·￠Æô¶ˉ
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //ADCêy¾Yóò¶ÔÆë
ADC_InitStructure.ADC_NbrOfChannel = 1; //Ë3Dò½øDD1æÔò×a»»μÄADCí¨μàμÄêyÄ¿
ADC_Init(ADC1, &ADC_InitStructure); //¸ù¾YADC_InitStructÖDÖ¸¶¨μÄ2Îêy3õê¼»ˉíaéèADCxμÄ¼Ä′æÆ÷


ADC_Cmd(ADC1, ENABLE); //ê1ÄüÖ¸¶¨μÄADC1

ADC_ResetCalibration(ADC1); //ê1Äü¸′Î»D￡×¼

while(ADC_GetResetCalibrationStatus(ADC1)); //μè′y¸′Î»D￡×¼½áêø

ADC_StartCalibration(ADC1);    //¿aÆôADD￡×¼

while(ADC_GetCalibrationStatus(ADC1));    //μè′yD￡×¼½áêø

// ADC_SoftwareStartConvCmd(ADC1, ENABLE); //ê1ÄüÖ¸¶¨μÄADC1μÄèí¼t×a»»Æô¶ˉ1|Äü

}
//»ñμÃADCÖμ
//ch:í¨μàÖμ 0~3
u16 Get_Adc(u8 ch)
{

    //éèÖÃÖ¸¶¨ADCμÄ1æÔò×éí¨μà￡¬ò»¸öDòáD￡¬2éÑùê±¼ä

ADC_RegularChannelConfig(ADC1, ch, 1, ADC_SampleTime_13Cycles5 ); //ADC1,ADCí¨μà


ADC_SoftwareStartConvCmd(ADC1, ENABLE); //ê1ÄüÖ¸¶¨μÄADC1μÄèí¼t×a»»Æô¶ˉ1|Äü

while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC ));//μè′y×a»»½áêø

return ADC_GetConversionValue(ADC1); //·μ»Ø×î½üò»′ÎADC11æÔò×éμÄ×a»»½á1û
}

u16 Get_Adc_Average(u8 ch,u8 times)
{
u32 temp_val=0;
u8 t;
for(t=0;t<times;t++)
{
temp_val+=Get_Adc(ch);
delay_ms(5);
}
return temp_val/times;
}    [/mw_shl_code]

QQ图片20180516134603.png