请教下STM32 用TIM 触发ADC

只看该作者 · 2012-7-18 19:51

例程给的是用ADC_ExternalTrigConv_T1_CC4作为触发源。
但是我想用ADC_ExternalTrigConv_T3_TRGO触发，谁有相关程序？可否发我一份，或者贴出相关代码也行。谢啦！
下面是我的代码，虽然ADC也能采样，但是采样时间间隔不是我设定的频率。

#include "stm32f0xx.h"

__IO uint16_t  ADC1ConvertedValue = 0, ADC1ConvertedVoltage = 0;
__IO uint32_t ADCmvoltp = 0 ;
ADC_InitTypeDef       ADC_InitStructure;
GPIO_InitTypeDef       GPIO_InitStructure;
void ADC_TIM_Config(void);

int main(void)
{
  ADC_TIM_Config();

  while (1)
  {
while(ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC) == RESET);
ADC1ConvertedValue =ADC_GetConversionValue(ADC1);
ADC1ConvertedVoltage = (ADC1ConvertedValue *3300)/0xFFF;
  }
}

void ADC_TIM_Config(void)
{
  /* GPIOC Periph clock enable */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOC, ENABLE);

  /* ADC1 and TIM1 Periph clock enable */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1  , ENABLE);
  /* Configure ADC Channel11 as analog input */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1 ;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
  GPIO_Init(GPIOC, &GPIO_InitStructure);


  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
  TIM_OCInitTypeDef       TIM_OCInitStructure;

  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3 , ENABLE);
  /* TIM1 Configuration */
  TIM_DeInit(TIM3);
  TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
  TIM_OCStructInit(&TIM_OCInitStructure);
  /* Time base configuration */
  TIM_TimeBaseStructure.TIM_Period = 0xFF;
  TIM_TimeBaseStructure.TIM_Prescaler = 0x0;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

  /* Output Compare PWM Mode configuration */
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; /* low edge by default */
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = 0x01;
  TIM_OC1Init(TIM3, &TIM_OCInitStructure);

  TIM_SelectOutputTrigger(TIM3, TIM_TRGOSource_Update);
  TIM_SelectMasterSlaveMode(TIM3, TIM_MasterSlaveMode_Enable);
  /* TIM1 enable counter */
  TIM_Cmd(TIM3, ENABLE);

  /* Main Output Enable */
  TIM_CtrlPWMOutputs(TIM3, ENABLE);

/* ADCs DeInit */
  ADC_DeInit(ADC1);

  /* Initialize ADC structure */
  ADC_StructInit(&ADC_InitStructure);

  /* Configure the ADC1 in continous mode withe a resolutuion equal to 12 bits  */
  ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
  ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
  ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_Rising;
  ADC_InitStructure.ADC_ExternalTrigConv =  ADC_ExternalTrigConv_T3_TRGO ;
  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
  ADC_InitStructure.ADC_ScanDirection = ADC_ScanDirection_Upward;
  ADC_Init(ADC1, &ADC_InitStructure);

  /* Convert the ADC1 Channel 11 with 239.5 Cycles as sampling time */
  ADC_ChannelConfig(ADC1, ADC_Channel_11 , ADC_SampleTime_239_5Cycles);

  /* ADC Calibration */
  ADC_GetCalibrationFactor(ADC1);

  /* Enable ADCperipheral[PerIdx] */
  ADC_Cmd(ADC1, ENABLE);

  /* Wait the ADCEN falg */
  while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_ADEN));

  /* ADC1 regular Software Start Conv */
  ADC_StartOfConversion(ADC1);
}