【stm32】hal库学习笔记-DAC数模转换（超详细！）

DAC功能概述

DAC：将数字信号转换为模拟信号

并行式
分辨率 采样速率

DAC驱动函数

Cube图形化配置

导入TFT_LCD ioc
设置DAC通道

更改ADC配置

优先级设置

更改TIM3配置

按键配置



移入按键和触摸屏驱动文件

程序编写

/* USER CODE BEGIN Includes */
#include "lcd.h"
#include "keyled.h"
/* USER CODE END Includes */

/* USER CODE BEGIN 2 */
  lcd_init();
  lcd_show_str(10, 10, 24, "Demo15_1: DAC1 by soft trigger", RED);
  lcd_show_str(10, 40, 24, "Connect PA4 & PA5", RED);
  lcd_show_str(10, 70, 24, "DAC1 output to PA4", RED);
  lcd_show_str(10,100, 24, "ADC1-IN5 acquire PA5", RED);
  lcd_show_str(10,130, 24, "KeyUp   = DAC1 output ++", RED);
  lcd_show_str(10,160, 24, "KeyDown = DAC1 output --", RED);

  lcd_show_str(10,220, 24, "DAC Output =", RED);
  lcd_show_str(10,280, 24, "ADC Input =", RED);
  lcd_show_str(10,340, 24, "Voltage(mV) = ", RED);

  HAL_DAC_Start(&hdac, DAC_CHANNEL_1);
  uint32_t DacOutValue = 1000;
  HAL_DAC_SetValue(&hdac, DAC_CHANNEL_1, DAC_ALIGN_12B_R, DacOutValue);
  lcd_show_num(50, 250, DacOutValue, 4, 24, RED);

  HAL_ADC_Start_IT(&hadc1);
  HAL_TIM_Base_Start(&htim3);

  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
	  KEYS curKey = ScanPressedKey(KEY_WAIT_ALWAYS);
	  if (curKey == KEY_UP) {
		  DacOutValue += 50;
	  } else if (curKey == KEY_DOWN) {
		  DacOutValue -= 50;
	  }

	  HAL_DAC_SetValue(&hdac, DAC_CHANNEL_1, DAC_ALIGN_12B_R, DacOutValue);
	  lcd_show_num(50, 250, DacOutValue, 4, 24, RED);
	  HAL_Delay(300);
    /* USER CODE END WHILE */

/* USER CODE BEGIN 4 */
void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef* hadc) {
	uint32_t val = HAL_ADC_GetValue(hadc);
	lcd_show_num(50, 310, val, 4, 24, RED);

	uint32_t Volt = val * 3300 >> 12;
	lcd_show_num(50, 370, Volt, 4, 24, RED);
}
/* USER CODE END 4 */