【stm32】DAC输出三角波锯齿波

【stm32】DAC输出三角波锯齿波及任意波形

导入DAC.ioc（见上节DAC学习笔记）

DAC输出三角波

CubeMX图形化配置

DAC配置

实现0.1ms定时周期
时钟树配置

程序编写

/* USER CODE BEGIN Includes */
#include "lcd.h"
/* USER CODE END Includes */
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  /* USER CODE BEGIN 2 */
  lcd_init();
  lcd_show_str(10, 10, 24, "Demo15_2: DAC1 triggered by TIM6", RED);
  lcd_show_str(10, 40, 24, "Triangular wave on PA4", RED);
  lcd_show_str(10, 70, 24, "Wave's interval is 819ms", RED);

  HAL_DAC_Start(&hdac, DAC_CHANNEL_1);
  uint32_t DCValue = 0;
  HAL_DAC_SetValue(&hdac, DAC_CHANNEL_1, DAC_ALIGN_12B_R, DCValue);
  HAL_TIM_Base_Start(&htim6);

  /* USER CODE END 2 */
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实现效果

采用CubeMonitor监测生成波形

也可用示波器检测波形生成结果

生成噪声波

在此处更改配置

生成锯齿波（任意波形）

使用DMA触发任意波形


若要调整锯齿波的周期，修改TIM6的分频系数和计数周期即可

程序编写

/* USER CODE BEGIN Includes */
#include "lcd.h"
#include "keyled.h"
/* USER CODE END Includes */
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  /* USER CODE BEGIN 2 */
  lcd_init();
  lcd_show_str(10, 10, 24, "Demo15_3: DAC output with DMA", RED);
  lcd_show_str(10, 40, 24, "Sawtooth wave on PA4", RED);
  lcd_show_str(10, 70, 24, "Wave's interval is 100ms", RED);

  uint32_t userWave[1000];
  userWave[0] = 0;
  for (uint16_t i = 1; i < 1000; ++i) {
	  userWave[i] = userWave[i - 1] + 4;
  }
  HAL_DAC_Start_DMA(&hdac, DAC_CHANNEL_1, userWave, 1000, DAC_ALIGN_12B_R);
  HAL_TIM_Base_Start(&htim6);

  /* USER CODE END 2 */
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重写回调函数

/* USER CODE BEGIN 4 */
void HAL_DAC_ConvCpltCallbackCh1(DAC_HandleTypeDef *hdac) {
	LED0_Toggle();
}
/* USER CODE END 4 */
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