DAC输出阶梯波与tim3同时输出，示波器观察阶梯波摆动

dczjn

本帖内容接上帖内容阶梯波程序


#include "DmaDacTim6.h"
/**
  * @brief  Configures the different system clocks.
  * @param  None
  * @retval None
  */
//extern        const uint8_t  Escalator8bit[6] ;

void RCC_Configuration( void)
{   
  /* Enable peripheral clocks ------------------------------------------------*/
#if !defined STM32F10X_LD_VL && !defined STM32F10X_MD_VL
  /* DMA2 clock enable */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA2, ENABLE);
#else
  /* DMA1 clock enable */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
#endif
  /* GPIOA Periph clock enable */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
  /* DAC Periph clock enable */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);
  /* TIM6 Periph clock enable */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM6, ENABLE);
}


/**
  * @brief  Configures the different GPIO ports.
  * @param  None
  * @retval None
  */
void GPIO_Configuration(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;

  /* Once the DAC channel is enabled, the corresponding GPIO pin is automatically
     connected to the DAC converter. In order to avoid parasitic consumption,
     the GPIO pin should be configured in analog */
  GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_4;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
}

/**
  * @brief  Inserts a delay time.
  * @param  nCount: specifies the delay time length.
  * @retval None
  */
void Delay(__IO uint32_t nCount)
{
  for(; nCount != 0; nCount--);
}

void DacDmaTim6(void)
{
         const uint8_t Escalator8bit[6] = {0x0, 0x33, 0x66, 0x99, 0xCC, 0xFF};
        DAC_InitTypeDef            DAC_InitStructure;
  DMA_InitTypeDef            DMA_InitStructure;
/*!< 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();   

  /* Once the DAC channel is enabled, the corresponding GPIO pin is automatically
     connected to the DAC converter. In order to avoid parasitic consumption,
     the GPIO pin should be configured in analog */
  GPIO_Configuration();

  /* TIM6 Configuration */
  TIM_PrescalerConfig(TIM6, 0xF, TIM_PSCReloadMode_Update);
  TIM_SetAutoreload(TIM6, 0xFF);
  /* TIM6 TRGO selection */
  TIM_SelectOutputTrigger(TIM6, TIM_TRGOSource_Update);

  /* DAC channel1 Configuration */
  DAC_InitStructure.DAC_Trigger = DAC_Trigger_T6_TRGO;
  DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;
  DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Disable;
  DAC_Init(DAC_Channel_1, &DAC_InitStructure);

#if !defined STM32F10X_LD_VL && !defined STM32F10X_MD_VL
  /* DMA2 channel3 configuration */
  DMA_DeInit(DMA2_Channel3);
#else
  /* DMA1 channel3 configuration */
  DMA_DeInit(DMA1_Channel3);
#endif

  DMA_InitStructure.DMA_PeripheralBaseAddr = DAC_DHR8R1_Address;
//          DMA_InitStructure.DMA_PeripheralBaseAddr = DAC_DHR12R1 ;
  DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&Escalator8bit;

  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
  DMA_InitStructure.DMA_BufferSize = 6;
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
  DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
  DMA_InitStructure.DMA_Priority = DMA_Priority_High;
  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;

#if !defined STM32F10X_LD_VL && !defined STM32F10X_MD_VL
  DMA_Init(DMA2_Channel3, &DMA_InitStructure);
  /* Enable DMA2 Channel3 */
  DMA_Cmd(DMA2_Channel3, ENABLE);
#else
  DMA_Init(DMA1_Channel3, &DMA_InitStructure);
  /* Enable DMA1 Channel3 */
  DMA_Cmd(DMA1_Channel3, ENABLE);
#endif

  /* Enable DAC Channel1: Once the DAC channel1 is enabled, PA.04 is
     automatically connected to the DAC converter. */
  DAC_Cmd(DAC_Channel_1, ENABLE);

  /* Enable DMA for DAC Channel1 */
  DAC_DMACmd(DAC_Channel_1, ENABLE);

  /* TIM6 enable counter */
  TIM_Cmd(TIM6, ENABLE);
}

void DacDmaTim6_InitConfg( void)
{
         RCC_Configuration();
   GPIO_Configuration();
         DacDmaTim6( );
}

dczjn

如何让这两个相位同步