STM32定时器触发ADC采样+DMA模式参考程序

3万 · 2014-7-20 18:04

本帖最后由 mmuuss586 于 2014-7-20 18:13 编辑

:)
DMA采用：循环模式，在程序查询DMA完成标志即可判断一组数据有没有转换完成；

中断：定时器，DMA，ADC中断未使用；

参考程序：

main.rar (2.6 KB)

3万 · 2014-7-20 18:13

#define ADC1_DR_Address ((uint32_t)0x4001244C)

/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
ADC_InitTypeDef          ADC_InitStructure;
DMA_InitTypeDef          DMA_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef       TIM_OCInitStructure;
__IO uint16_t ADC_RegularConvertedValueTab[32], ADC_InjectedConvertedValueTab[32];

/* Private function prototypes -----------------------------------------------*/
void RCC_Configuration(void);
void GPIO_Configuration(void);

/* Private functions ---------------------------------------------------------*/

/**
  * @brief Main program
  * @param  None
  * @retval None
  */
int main(void)
{
  /*!< At this stage the microcontroller clock setting is already configured,
   this is done through SystemInit() function which is called from startup
   file (startup_stm32f10x_xx.s) before to branch to application main.
   To reconfigure the default setting of SystemInit() function, refer to
   system_stm32f10x.c file
   */

  /* System clocks configuration ---------------------------------------------*/
  RCC_Configuration();

  /* NVIC configuration ------------------------------------------------------*/
//  NVIC_Configuration();

  /* GPIO configuration ------------------------------------------------------*/
  GPIO_Configuration();

  /* TIM1 configuration ------------------------------------------------------*/
  /* Time Base configuration */
  TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
  TIM_TimeBaseStructure.TIM_Period = 1000;
  TIM_TimeBaseStructure.TIM_Prescaler = 71;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
  /* TIM1 channel1 configuration in PWM mode */
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = 500;
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
  TIM_OC1Init(TIM1, &TIM_OCInitStructure);

  /* DMA1 Channel1 Configuration ----------------------------------------------*/
  DMA_DeInit(DMA1_Channel1);
  DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address;
  DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)ADC_RegularConvertedValueTab;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
  DMA_InitStructure.DMA_BufferSize = 16;
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
  DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
  DMA_InitStructure.DMA_Priority = DMA_Priority_High;
  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
  DMA_Init(DMA1_Channel1, &DMA_InitStructure);

  /* Enable DMA1 channel1 */
  DMA_Cmd(DMA1_Channel1, ENABLE);

  /* ADC1 configuration ------------------------------------------------------*/
  ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
  ADC_InitStructure.ADC_ScanConvMode = DISABLE;
  ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
  ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1;
  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
  ADC_InitStructure.ADC_NbrOfChannel = 1;
  ADC_Init(ADC1, &ADC_InitStructure);

  /* ADC1 regular channel14 configuration */
  ADC_RegularChannelConfig(ADC1, ADC_Channel_14, 1, ADC_SampleTime_71Cycles5);
  /* Set injected sequencer length */
  ADC_InjectedSequencerLengthConfig(ADC1, 1);

////  /* ADC1 injected channel Configuration */
////  ADC_InjectedChannelConfig(ADC1, ADC_Channel_11, 1, ADC_SampleTime_71Cycles5);
////  /* ADC1 injected external trigger configuration */
////  ADC_ExternalTrigInjectedConvConfig(ADC1, ADC_ExternalTrigInjecConv_None);

  /* Enable automatic injected conversion start after regular one */
  ADC_AutoInjectedConvCmd(ADC1, ENABLE);

  /* Enable ADC1 DMA */
  ADC_DMACmd(ADC1, ENABLE);

  /* Enable ADC1 external trigger */
  ADC_ExternalTrigConvCmd(ADC1, ENABLE);

////  /* Enable JEOC interrupt */
////  ADC_ITConfig(ADC1, ADC_IT_JEOC, ENABLE);

  /* Enable ADC1 */
  ADC_Cmd(ADC1, ENABLE);

  /* Enable ADC1 reset calibration register */
  ADC_ResetCalibration(ADC1);
  /* Check the end of ADC1 reset calibration register */
  while(ADC_GetResetCalibrationStatus(ADC1));

  /* Start ADC1 calibration */
  ADC_StartCalibration(ADC1);
  /* Check the end of ADC1 calibration */
  while(ADC_GetCalibrationStatus(ADC1));

  /* TIM1 main Output Enable */
  TIM_CtrlPWMOutputs(TIM1, ENABLE);
  while (1)
{
TIM_Cmd(TIM1, ENABLE);
/* Test on channel1 transfer complete flag */
while(!DMA_GetFlagStatus(DMA1_FLAG_TC1));
/* Clear channel1 transfer complete flag */
DMA_ClearFlag(DMA1_FLAG_TC1);
/* TIM1 counter disable */
TIM_Cmd(TIM1, DISABLE);
}
}