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標(biāo)題: STM32F373的ADC采樣問題，必須采樣轉(zhuǎn)換2次才有數(shù)據(jù)，什么原因？ [打印本頁]

作者: abnsl 時(shí)間: 2019-7-23 15:42
標(biāo)題: STM32F373的ADC采樣問題，必須采樣轉(zhuǎn)換2次才有數(shù)據(jù)，什么原因？
本帖最后由 abnsl 于 2019-7-23 15:45 編輯

STM32F373的ADC采樣問題，必須采樣轉(zhuǎn)換2次才有數(shù)據(jù)，什么原因？

void AI_ADCInit(void)
{

GPIO_InitTypeDef GPIO_InitStruct;
ADC_InitTypeDef ADC_InitStruct;
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
RCC_ADCCLKConfig(RCC_PCLK2_Div6);//72M/6=12, ADC²ÉÑù×î¸ßÆµÂÊ14MHz

GPIO_InitStruct.GPIO_Pin=GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3;
GPIO_InitStruct.GPIO_Mode=GPIO_Mode_AN;
//GPIO_InitStruct.GPIO_Speed=GPIO_Speed_50MHz;
//GPIO_InitStruct.GPIO_OType=GPIO_OType_PP;
//GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOA, &GPIO_InitStruct);
//=======================================

ADC_DeInit(ADC1);
ADC_StructInit(&ADC_InitStruct);

/* initialize the ADC_ScanConvMode member */
  ADC_InitStruct.ADC_ScanConvMode = DISABLE;
  /* Initialize the ADC_ContinuousConvMode member */
  ADC_InitStruct.ADC_ContinuousConvMode = DISABLE;
  /* Initialize the ADC_ExternalTrigConv member */
  ADC_InitStruct.ADC_ExternalTrigConv =ADC_ExternalTrigConv_T19_TRGO;
  /* Initialize the ADC_DataAlign member */
  ADC_InitStruct.ADC_DataAlign = ADC_DataAlign_Right;
  /* Initialize the ADC_NbrOfChannel member */
  ADC_InitStruct.ADC_NbrOfChannel = 1;
  ADC_Init(ADC1,&ADC_InitStruct);

void AI_excute(void)
{
uint16_t i=0,j=0,num=0;

if((num=Order[1]&0x02))
{
      printf("AI2 in !\r\n");
      ADC_RegularChannelConfig(ADC1,ADC_Channel_3,1,ADC_SampleTime_239Cycles5);

ADC_Cmd(ADC1,ENABLE);

ADC_ResetCalibration(ADC1);
  while(ADC_GetResetCalibrationStatus(ADC1));
  ADC_StartCalibration(ADC1);
  while(ADC_GetCalibrationStatus(ADC1));

ADC_Cmd(ADC1,ENABLE);//使能第二次

ADC_ClearFlag(ADC1,ADC_FLAG_STRT);
ADC_SoftwareStartConv(ADC1);
while(ADC_GetFlagStatus(ADC1,ADC_FLAG_STRT));
while(ADC_GetFlagStatus(ADC1,ADC_FLAG_EOC));
Aivalue=ADC_GetConversionValue(ADC1);
delay_nms(200);

Aivalue=(Aivalue/4096)*3.3;
ADC_ClearFlag(ADC1,ADC_FLAG_EOC);//ADC_FLAG_EOC/ADC_FLAG_STR

printf("AI2 value is %f !\r\n",Aivalue);//--------------到這里輸出還是0 ，這一次采樣值為0

ADC_ClearFlag(ADC1,ADC_FLAG_STRT);
ADC_SoftwareStartConv(ADC1);
while(ADC_GetFlagStatus(ADC1,ADC_FLAG_STRT));
while(ADC_GetFlagStatus(ADC1,ADC_FLAG_EOC));
Aivalue=ADC_GetConversionValue(ADC1);
delay_nms(200);

Aivalue=(Aivalue/4096)*3.3;//-------------------到這里采樣就正常了，考慮過是否是采樣時(shí)間延時(shí)不夠，但好像不是這個(gè)問題。

}

作者: abnsl 時(shí)間: 2019-7-23 15:44
void AI_ADCInit(void)
{

GPIO_InitTypeDef GPIO_InitStruct;
ADC_InitTypeDef ADC_InitStruct;
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
RCC_ADCCLKConfig(RCC_PCLK2_Div6);//72M/6=12, ADC²ÉÑù×î¸ßÆµÂÊ14MHz

GPIO_InitStruct.GPIO_Pin=GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3;
GPIO_InitStruct.GPIO_Mode=GPIO_Mode_AN;
//GPIO_InitStruct.GPIO_Speed=GPIO_Speed_50MHz;
//GPIO_InitStruct.GPIO_OType=GPIO_OType_PP;
//GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOA, &GPIO_InitStruct);
//=======================================

ADC_DeInit(ADC1);
ADC_StructInit(&ADC_InitStruct);

/* initialize the ADC_ScanConvMode member */
  ADC_InitStruct.ADC_ScanConvMode = DISABLE;
  /* Initialize the ADC_ContinuousConvMode member */
  ADC_InitStruct.ADC_ContinuousConvMode = DISABLE;
  /* Initialize the ADC_ExternalTrigConv member */
  ADC_InitStruct.ADC_ExternalTrigConv =ADC_ExternalTrigConv_T19_TRGO;
  /* Initialize the ADC_DataAlign member */
  ADC_InitStruct.ADC_DataAlign = ADC_DataAlign_Right;
  /* Initialize the ADC_NbrOfChannel member */
  ADC_InitStruct.ADC_NbrOfChannel = 1;
  ADC_Init(ADC1,&ADC_InitStruct);

這是初始化內(nèi)容

作者: abnsl 時(shí)間: 2019-8-9 16:12

沒有人回答?

作者: abnsl 時(shí)間: 2019-11-25 21:48

還沒有解決

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