stm32H743 DAC输出的三角波频率有问题

花开不语 · 发表于 2019-11-7 16:29:06

本人现在用板子自带的dac输出三角波，用示波器观察是有三角波的，但频率高达30MHz，然后改变定时器的arr和psc以及dac里的DAC_TRIANGLEAMPLITUDE_1023，都不能改变频率，看了好多的帖子，也换了好几种格式写的的程序，一直出现这个问题，希望大家帮帮我吧。
代码如下：main.c

#include "sys.h"
#include "delay.h"
#include "usart.h"
#include "led.h"
#include "key.h"
#include "lcd.h"
#include "sdram.h"
#include "usmart.h"
#include "dac.h"
DAC_HandleTypeDef DacHandle;
static DAC_ChannelConfTypeDef sConfig;
static void DAC_Ch1_TriangleConfig(void);
static void TIM6_Config(void);
static void DAC_Ch1_TriangleConfig(void)
{
   DacHandle.Instance = DACx;
  /*##-1- Initialize the DAC peripheral ######################################*/
  if (HAL_DAC_Init(&DacHandle) != HAL_OK)
  {
/* DAC initialization Error */
//Error_Handler();
  }

  /*##-2- DAC channel2 Configuration #########################################*/
  sConfig.DAC_Trigger = DAC_TRIGGER_T6_TRGO;
  sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_ENABLE;

  if (HAL_DAC_ConfigChannel(&DacHandle, &sConfig, DACx_CHANNEL) != HAL_OK)
  {
/* Channel configuration Error */
//Error_Handler();
  }

  /*##-3- DAC channel2 Triangle Wave generation configuration ################*/
  if (HAL_DACEx_TriangleWaveGenerate(&DacHandle, DACx_CHANNEL, DAC_TRIANGLEAMPLITUDE_1023) != HAL_OK)
  {
/* Triangle wave generation Error */
//Error_Handler();
  }

  /*##-4- Enable DAC Channel1 ################################################*/
  if (HAL_DAC_Start(&DacHandle, DACx_CHANNEL) != HAL_OK)
  {
/* Start Error */
// Error_Handler();
  }

  /*##-5- Set DAC channel1 DHR12RD register ################################################*/
  if (HAL_DAC_SetValue(&DacHandle, DACx_CHANNEL, DAC_ALIGN_12B_R, 0x100) != HAL_OK)
  {
/* Setting value Error */
// Error_Handler();
  }
}

void TIM6_Config(void)
{
  static TIM_HandleTypeDef  htim;
  TIM_MasterConfigTypeDef sMasterConfig;

  /*##-1- Configure the TIM peripheral #######################################*/
  /* Time base configuration */
  htim.Instance = TIM6;

  htim.Init.Period          = 0x7FF;//=2014-1
  htim.Init.Prescaler       = 0;
  htim.Init.ClockDivision    = 0;
  htim.Init.CounterMode    = TIM_COUNTERMODE_UP;
  htim.Init.RepetitionCounter = 0;
  HAL_TIM_Base_Init(&htim);

  /* TIM6 TRGO selection */
  sMasterConfig.MasterOutputTrigger = TIM_TRGO_UPDATE;
  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;

  HAL_TIMEx_MasterConfigSynchronization(&htim, &sMasterConfig);

  /*##-2- Enable TIM peripheral counter ######################################*/
  HAL_TIM_Base_Start(&htim);
}
void HAL_TIM_Base_MspInit(TIM_HandleTypeDef *htim)
{
  /* TIM6 Periph clock enable */
  __HAL_RCC_TIM6_CLK_ENABLE();
}

void HAL_TIM_Base_MspDeInit(TIM_HandleTypeDef *htim)
{

  /*##-1- Reset peripherals ##################################################*/
  __HAL_RCC_TIM6_FORCE_RESET();
  __HAL_RCC_TIM6_RELEASE_RESET();
}

int main(void)
{

Cache_Enable();
HAL_Init();
Stm32_Clock_Init(160,5,2,4);
delay_init(400);
uart_init(115200);
usmart_dev.init(200);
LED_Init();
KEY_Init();
SDRAM_Init();
      TIM6_Config();
while(1)
{

   HAL_DAC_DeInit(&DacHandle);
   DAC_Ch1_TriangleConfig();

}
}
dac.h
#ifndef __DAC_H
#define __DAC_H
#include "sys.h"
#define DACx                         DAC1
#define DACx_CHANNEL_GPIO_CLK_ENABLE()  __HAL_RCC_GPIOA_CLK_ENABLE()
#define DMAx_CLK_ENABLE()             __HAL_RCC_DMA1_CLK_ENABLE()

#define DACx_CLK_ENABLE()             __HAL_RCC_DAC12_CLK_ENABLE()
#define DACx_FORCE_RESET()             __HAL_RCC_DAC12_FORCE_RESET()
#define DACx_RELEASE_RESET()          __HAL_RCC_DAC12_RELEASE_RESET()

/* Definition for DACx Channel Pin */
#define DACx_CHANNEL_PIN             GPIO_PIN_4
#define DACx_CHANNEL_GPIO_PORT       GPIOA

/* Definition for DACx's Channel */

#define DACx_CHANNEL                   DAC_CHANNEL_1

/* Definition for DACx's DMA_STREAM */
#define DACx_DMA_INSTANCE             DMA1_Stream5

/* Definition for DACx's NVIC */
#define DACx_DMA_IRQn                DMA1_Stream5_IRQn
#define DACx_DMA_IRQHandler          DMA1_Stream5_IRQHandler

#endif