前言
  I1 t) b+ k- V" VG4板载了四个电位器，其中左边两个是电压采集用的，本篇文章将讲述如何单片机的adc功能采集左边两个滑变的电压值。
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6 r- O% B3 R4 [7 @: H. I& G3 TADC
1.原理图以及配置元素
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* _/ S; ]8 V( O! _分析:由图知，PB15作为左边第一个旋钮的采集引脚，PB12作为左边第二个旋钮的采集引脚。
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2.CubeMx的配置步骤


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将PB12设置为ADC1的通道11，PB15设置为ADC2的通道15。进入Analog中的ADC1和ADC2。
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# Q3 Z1 Q& }7 q) _只需激活ADC1通道11的Single-ended采集功能，不需要其他配置。


只需激活ADC2通道15的Single-ended采集功能，不需要其他配置。
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7 \/ E8 U/ c0 t3.生成工程
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点击完生成代码之后进入工程文件夹中的bsp文件夹


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在bsp文件中新建badc.c和badc.h文件(不用adc.c和adc.h命名是为了防止与CubeMx生成的文件起冲突)
6 m* n+ K' C$ [. p  H0 `3 l; J1 w打开工程将两个文件添加到工程中去
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8 z! }' S; l9 G! v至此工程就建立完毕了
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1 l# h; y2 b+ e' T% s! j7 T4.测试代码
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1. #ifndef __BADC_H__
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2. #define __BADC_H__
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3. 
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4. #include "main.h"
   
5. double getADC(ADC_HandleTypeDef *hadc);
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6. 
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7. #endif
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8. 
   

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badc.c:

1. #include "badc.h"
   
2. 
   
3. double getADC(ADC_HandleTypeDef *hadc)
   
4. {
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5.         unsigned int adc;
   
6.         HAL_ADC_Start(hadc);
   
7.         adc = HAL_ADC_GetValue(hadc);
   
8.         return adc * 3.3 / 4096;
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9. }
   
10. 
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4 y+ k- S4 D8 u9 Kmain.c:

1. /* USER CODE BEGIN Header */
   
2. /**
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3.   ******************************************************************************
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4.   * @file           : main.c
   
5.   * @brief          : Main program body
   
6.   ******************************************************************************
   
7.   * @attention
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8.   *
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9.   * <h2><center>© Copyright (c) 2023 STMicroelectronics.
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10.   * All rights reserved.</center></h2>
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11.   *
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12.   * This software component is licensed by ST under BSD 3-Clause license,
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13.   * the "License"; You may not use this file except in compliance with the
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14.   * License. You may obtain a copy of the License at:
    
15.   *                        opensource.org/licenses/BSD-3-Clause
    
16.   *
    
17.   ******************************************************************************
    
18.   */
    
19. /* USER CODE END Header */
    
20. /* Includes ------------------------------------------------------------------*/
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21. #include "main.h"
    
22. #include "adc.h"
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23. #include "tim.h"
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24. #include "gpio.h"
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25. 
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26. /* Private includes ----------------------------------------------------------*/
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27. /* USER CODE BEGIN Includes */
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28. #include "led.h"
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29. #include "lcd.h"
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30. #include "stdio.h"
    
31. #include "interrupt.h"
    
32. #include "badc.h"
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33. /* USER CODE END Includes */
    
34. 
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35. /* Private typedef -----------------------------------------------------------*/
    
36. /* USER CODE BEGIN PTD */
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37. 
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38. /* USER CODE END PTD */
    
39. 
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40. /* Private define ------------------------------------------------------------*/
    
41. /* USER CODE BEGIN PD */
    
42. /* USER CODE END PD */
    
43. 
    
44. /* Private macro -------------------------------------------------------------*/
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45. /* USER CODE BEGIN PM */
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46. 
    
47. /* USER CODE END PM */
    
48. 
    
49. /* Private variables ---------------------------------------------------------*/
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50. 
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51. /* USER CODE BEGIN PV */
    
52. extern struct keys key[];
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53. unsigned char pa6_duty = 10; //设置PA6初始PWM波占空比为10%
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54. unsigned char pa7_duty = 10; //设置PA7初始PWM波占空比为10%
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55. /* USER CODE END PV */
    
56. 
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57. /* Private function prototypes -----------------------------------------------*/
    
58. void SystemClock_Config(void);
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59. /* USER CODE BEGIN PFP */
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60. void Dispose_Key(void);
    
61. void LCD_Display(void);
    
62. /* USER CODE END PFP */
    
63. 
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64. /* Private user code ---------------------------------------------------------*/
    
65. /* USER CODE BEGIN 0 */
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66. 
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67. /* USER CODE END 0 */
    
68. 
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69. /**
    
70.   * @brief  The application entry point.
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71.   * @retval int
    
72.   */
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73. int main(void)
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74. {
    
75.   /* USER CODE BEGIN 1 */
    
76. 
    
77.   /* USER CODE END 1 */
    
78. 
    
79.   /* MCU Configuration--------------------------------------------------------*/
    
80. 
    
81.   /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
    
82.   HAL_Init();
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83. 
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84.   /* USER CODE BEGIN Init */
    
85. 
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86.   /* USER CODE END Init */
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87. 
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88.   /* Configure the system clock */
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89.   SystemClock_Config();
    
90. 
    
91.   /* USER CODE BEGIN SysInit */
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92. 
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93.   /* USER CODE END SysInit */
    
94. 
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95.   /* Initialize all configured peripherals */
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96.   MX_GPIO_Init();
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97.   MX_TIM3_Init();
    
98.   MX_TIM16_Init();
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99.   MX_TIM17_Init();
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100.   MX_ADC1_Init();
     
101.   MX_ADC2_Init();
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102.   /* USER CODE BEGIN 2 */
     
103.         LCD_Init();
     
104.   /* USER CODE END 2 */
     
105. 
     
106.   /* Infinite loop */
     
107.   /* USER CODE BEGIN WHILE */
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108.         LCD_Clear(Black);        //清屏并将背景设为黑色
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109.         LCD_SetBackColor(Black); //设置字体背景颜色为黑色
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110.         LCD_SetTextColor(White); //设置字体文本颜色为白色
     
111. 
     
112.        
     
113.         HAL_TIM_Base_Start_IT(&htim3);
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114.         HAL_TIM_PWM_Start(&htim16, TIM_CHANNEL_1);
     
115.         HAL_TIM_PWM_Start(&htim17, TIM_CHANNEL_1);
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116.         LED_Disp(0x00);
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117.   while (1)
     
118.   {
     
119.     /* USER CODE END WHILE */
     
120. 
     
121.     /* USER CODE BEGIN 3 */
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122.                
     
123.                 Dispose_Key();
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124.     LCD_Display();
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125.                 char text[30];
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126.                 sprintf(text, "    V1:%.2f", getADC(&hadc1));
     
127.                 LCD_DisplayStringLine(Line6, (unsigned char *)text);
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128.                 sprintf(text, "    V2:%.2f", getADC(&hadc2));
     
129.                 LCD_DisplayStringLine(Line7, (unsigned char *)text);
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130.   }
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131.   /* USER CODE END 3 */
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132. }
     
133. 
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134. /**
     
135.   * @brief System Clock Configuration
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136.   * @retval None
     
137.   */
     
138. void SystemClock_Config(void)
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139. {
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140.   RCC_OscInitTypeDef RCC_OscInitStruct = {0};
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141.   RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
     
142.   RCC_PeriphCLKInitTypeDef PeriphClkInit = {0};
     
143. 
     
144.   /** Configure the main internal regulator output voltage
     
145.   */
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146.   HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1);
     
147.   /** Initializes the RCC Oscillators according to the specified parameters
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148.   * in the RCC_OscInitTypeDef structure.
     
149.   */
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150.   RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
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151.   RCC_OscInitStruct.HSEState = RCC_HSE_ON;
     
152.   RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
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153.   RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
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154.   RCC_OscInitStruct.PLL.PLLM = RCC_PLLM_DIV3;
     
155.   RCC_OscInitStruct.PLL.PLLN = 20;
     
156.   RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
     
157.   RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2;
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158.   RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;
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159.   if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
     
160.   {
     
161.     Error_Handler();
     
162.   }
     
163.   /** Initializes the CPU, AHB and APB buses clocks
     
164.   */
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165.   RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
     
166.                               |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
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167.   RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
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168.   RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
     
169.   RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
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170.   RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
     
171. 
     
172.   if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
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173.   {
     
174.     Error_Handler();
     
175.   }
     
176.   /** Initializes the peripherals clocks
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177.   */
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178.   PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_ADC12;
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179.   PeriphClkInit.Adc12ClockSelection = RCC_ADC12CLKSOURCE_SYSCLK;
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180.   if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
     
181.   {
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182.     Error_Handler();
     
183.   }
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184. }
     
185. 
     
186. /* USER CODE BEGIN 4 */
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187. void Dispose_Key(void)
     
188. {
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189.         if(key[1].single_flag == 1)
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190.         {
     
191.                 pa6_duty += 10; //每次B2按键按下PA6占空比加10%
     
192.                 if(pa6_duty > 90) //加到90%重新返回10%
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193.                         pa6_duty = 10;
     
194.                 __HAL_TIM_SetCompare(&htim16, TIM_CHANNEL_1, pa6_duty);//将pa6_duty的值设置到比较寄存器中
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195.                 key[1].single_flag = 0;
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196.         }
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197.         if(key[2].single_flag == 1)
     
198.         {
     
199.                 pa7_duty += 10; //每次B2按键按下PA6占空比加10%
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200.                 if(pa7_duty > 90) //加到90%重新返回10%
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201.                         pa7_duty = 10;
     
202.                 __HAL_TIM_SetCompare(&htim17, TIM_CHANNEL_1, pa7_duty);//将pa6_duty的值设置到比较寄存器中
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203.                 key[2].single_flag = 0;
     
204.         }
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205. }
     
206. 
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207. void LCD_Display(void)
     
208. {
     
209.         char text[30];
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210.         sprintf(text, "      Para");
     
211.         LCD_DisplayStringLine(Line0, (unsigned char *)text);
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212.         sprintf(text, "    PA6:%d%%", pa6_duty);
     
213.         LCD_DisplayStringLine(Line2, (unsigned char *)text);
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214.         sprintf(text, "    PA7:%d%%", pa7_duty);
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215.         LCD_DisplayStringLine(Line4, (unsigned char *)text);
     
216. }
     
217. 
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218. /* USER CODE END 4 */
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219. 
     
220. /**
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221.   * @brief  This function is executed in case of error occurrence.
     
222.   * @retval None
     
223.   */
     
224. void Error_Handler(void)
     
225. {
     
226.   /* USER CODE BEGIN Error_Handler_Debug */
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227.   /* User can add his own implementation to report the HAL error return state */
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228.   __disable_irq();
     
229.   while (1)
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230.   {
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231.   }
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232.   /* USER CODE END Error_Handler_Debug */
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233. }
     
234. 
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235. #ifdef  USE_FULL_ASSERT
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236. /**
     
237.   * @brief  Reports the name of the source file and the source line number
     
238.   *         where the assert_param error has occurred.
     
239.   * @param  file: pointer to the source file name
     
240.   * @param  line: assert_param error line source number
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241.   * @retval None
     
242.   */
     
243. void assert_failed(uint8_t *file, uint32_t line)
     
244. {
     
245.   /* USER CODE BEGIN 6 */
     
246.   /* User can add his own implementation to report the file name and line number,
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247.      ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
     
248.   /* USER CODE END 6 */
     
249. }
     
250. #endif /* USE_FULL_ASSERT */
     
251. 
     
252. /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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253. 
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5.演示效果
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, H. s2 a) P! m! q4 |版权声明：火花页.
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