求助：DAC输出三角波无波形

Dray

想分别输出正弦波和三角波，按照例程里修改的代码，但只能输出正弦波，将三角波部分拿出来单独编译可以输出三角波，请大家帮着找下问题。
代码如下：

#include "stm32f10x_lib.h"

#define DAC_DHR12RD_Address      0x40007420

/* Init Structure definition */

DAC_InitTypeDef            DAC_InitStructure;

DMA_InitTypeDef            DMA_InitStructure;

TIM_TimeBaseInitTypeDef    TIM_TimeBaseStructure;

/* Private macro -------------------------------------------------------------*/

/* Private variables ---------------------------------------------------------*/

ErrorStatus HSEStartUpStatus;

uc16 Sine12bit[32] = {2047, 2447, 2831, 3185, 3498, 3750, 3939, 4056, 4095, 4056,

                      3939, 3750, 3495, 3185, 2831, 2447, 2047, 1647, 1263, 909, 

                      599, 344, 155, 38, 0, 38, 155, 344, 599, 909, 1263, 1647};

u32 DualSine12bit[32];

u8 Idx = 0;

void Sin_Configuration(void)

{

  /* TIM8 Configuration */

  /* Time base configuration */

  TIM_TimeBaseStructInit(&TIM_TimeBaseStructure); 

  TIM_TimeBaseStructure.TIM_Period = 0x19;          

  TIM_TimeBaseStructure.TIM_Prescaler = 0x0;       

  TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;    

  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  

  TIM_TimeBaseInit(TIM8, &TIM_TimeBaseStructure);

  /* TIM8 TRGO selection */

  TIM_SelectOutputTrigger(TIM8, TIM_TRGOSource_Update);

  /* DAC channel2 Configuration */

  DAC_InitStructure.DAC_Trigger = DAC_Trigger_T8_TRGO;

  DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;

  DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Disable;

  DAC_Init(DAC_Channel_2, &DAC_InitStructure);

  /* Fill Sine32bit table */

  for (Idx= 0; Idx<32; Idx++)

  {

    DualSine12bit[Idx] = (Sine12bit[Idx] << 16) + (Sine12bit[Idx]);

  }

  /* DMA2 channel4 configuration */

  DMA_DeInit(DMA2_Channel4);

  DMA_InitStructure.DMA_PeripheralBaseAddr = DAC_DHR12RD_Address;

  DMA_InitStructure.DMA_MemoryBaseAddr = (u32)&DualSine12bit;

  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;

  DMA_InitStructure.DMA_BufferSize = 32;

  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;

  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;

  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;

  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word;

  DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;

  DMA_InitStructure.DMA_Priority = DMA_Priority_High;

  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;

  DMA_Init(DMA2_Channel4, &DMA_InitStructure);

  /* Enable DMA2 Channel4 */

  DMA_Cmd(DMA2_Channel4, ENABLE);

  /* Enable DAC Channel2 */

  DAC_Cmd(DAC_Channel_2, ENABLE);

    DAC_DMACmd(DAC_Channel_2, ENABLE);

  /* TIM8 enable counter */

  TIM_Cmd(TIM8, ENABLE);

  while (1)

  {

  }

}

void Tri_Configuration(void)

{

#ifdef DEBUG

  debug();

#endif

  /* TIM2 Configuration */

  TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);

  TIM_TimeBaseStructure.TIM_Period = 0xF;          

  TIM_TimeBaseStructure.TIM_Prescaler = 0xF;       

  TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;    

  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  

  TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

  /* TIM2 TRGO selection */

  TIM_SelectOutputTrigger(TIM2, TIM_TRGOSource_Update);

  /* DAC channel1 Configuration */

  DAC_InitStructure.DAC_Trigger = DAC_Trigger_T2_TRGO;

  DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_Triangle;

  DAC_InitStructure.DAC_LFSRUnmask_TriangleAmplitude = DAC_TriangleAmplitude_2047;

  DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Disable;

  DAC_Init(DAC_Channel_1, &DAC_InitStructure);

  /* Enable DAC Channel1 */

  DAC_Cmd(DAC_Channel_1, ENABLE);

  /* Set DAC dual channel DHR12RD register */

  DAC_SetDualChannelData(DAC_Align_12b_R, 0x100, 0x100);

  /* TIM2 enable counter */

  TIM_Cmd(TIM2, ENABLE);

  while (1)

  {

  }

}

正点原子

你怎么分别输出的?

Dray

回复【2楼】正点原子:
---------------------------------
查管脚资料找到DAC_OUT1和2分别对应PA4、5，想一个从PA4口输出，一个从PA5口输出，分别接示波器，结果只有正弦波能输出。

seupenn

DAC输出三角波的程序在哪儿下？

Dray

回复【4楼】seupenn:
---------------------------------
在Keil\ARM\Examples\ST\STM32F10xFWLib\Examples\DAC内有双通道输出三角波的例程