硬件原理图

程序：

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1. int main(void)
   
2. {
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3.     //Flash_EnableReadProtection();//RDP设置 使能读保护
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4.     HAL_Init();
   
5.     SystemClock_Config();
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6.     MX_GPIO_Init();
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7.     MX_DMA_Init();
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8.     MX_I2C1_Init();
   
9.     MX_ADC1_Init();
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10.     MX_TIM2_Init();
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11.     MX_NVIC_Init();
    
12.     HAL_TIM_Base_Start_IT(&htim2);
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13.     HAL_ADC_Start_DMA(&hadc1,(uint32_t *)&adcbuf,2);
    
14.     while(1)
    
15.     {
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16. 
    
17. 
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18.     }
    
19. }
    

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1. void MX_DMA_Init(void)
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2. {
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3. 
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4.   /* DMA controller clock enable */
   
5.   __HAL_RCC_DMA1_CLK_ENABLE();
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6. 
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7.   /* DMA interrupt init */
   
8.   /* DMA1_Channel1_IRQn interrupt configuration */
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9.   HAL_NVIC_SetPriority(DMA1_Channel1_IRQn, 1, 0);
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10.   HAL_NVIC_EnableIRQ(DMA1_Channel1_IRQn);
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11. 
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12. }
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1. uint16_t adcbuf[2];//0,电池电压, 1,温度ADC
   
2. 
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3. ADC_HandleTypeDef hadc1;
   
4. DMA_HandleTypeDef hdma_adc1;
   
5. 
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6. void MX_ADC1_Init(void)
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7. {
   
8.   ADC_AnalogWDGConfTypeDef AnalogWDGConfig = {0};
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9.   ADC_ChannelConfTypeDef sConfig = {0};
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10. 
    
11.   /** Configure the global features of the ADC (Clock, Resolution, Data Alignment and number of conversion)
    
12.   */
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13.   hadc1.Instance = ADC1;
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14.   hadc1.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4;
    
15.   hadc1.Init.Resolution = ADC_RESOLUTION_12B;
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16.   hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
    
17.   //hadc1.Init.ScanConvMode = ADC_SCAN_ENABLE;//STM32CubeMX生成,只能使用通道 0-14，不能使用通道 15,16,17,18；
    
18.   hadc1.Init.ScanConvMode = ADC_SCAN_SEQ_FIXED;
    
19.   hadc1.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
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20.   hadc1.Init.LowPowerAutoWait = DISABLE;
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21.   hadc1.Init.LowPowerAutoPowerOff = DISABLE;
    
22.   hadc1.Init.ContinuousConvMode = ENABLE;
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23.   hadc1.Init.NbrOfConversion = 2;
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24.   //hadc1.Init.DiscontinuousConvMode = DISABLE;//STM32CubeMX生成,只能使用通道 0-14，不能使用通道 15,16,17,18；
    
25.   hadc1.Init.DiscontinuousConvMode = ENABLE;
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26.   hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;
    
27.   hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
    
28.   hadc1.Init.DMAContinuousRequests = ENABLE;
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29.   hadc1.Init.Overrun = ADC_OVR_DATA_PRESERVED;
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30.   hadc1.Init.SamplingTimeCommon1 = ADC_SAMPLETIME_160CYCLES_5;
    
31.   hadc1.Init.SamplingTimeCommon2 = ADC_SAMPLETIME_160CYCLES_5;
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32.   hadc1.Init.OversamplingMode = DISABLE;
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33.   hadc1.Init.TriggerFrequencyMode = ADC_TRIGGER_FREQ_HIGH;
    
34.   if (HAL_ADC_Init(&hadc1) != HAL_OK)
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35.   {
    
36.     Error_Handler();
    
37.   }
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38.   /** Configure Analog WatchDog 2
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39.   */
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40.   AnalogWDGConfig.WatchdogMode = ADC_ANALOGWATCHDOG_SINGLE_REG;
    
41.   if (HAL_ADC_AnalogWDGConfig(&hadc1, &AnalogWDGConfig) != HAL_OK)
    
42.   {
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43.     Error_Handler();
    
44.   }
    
45.   /** Configure Regular Channel
    
46.   */
    
47.   sConfig.Channel = ADC_CHANNEL_8;
    
48.   sConfig.Rank = ADC_REGULAR_RANK_1;
    
49.   sConfig.SamplingTime = ADC_SAMPLINGTIME_COMMON_1;
    
50.   if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
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51.   {
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52.     Error_Handler();
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53.   }
    
54.   /** Configure Regular Channel
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55.   */
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56.   sConfig.Channel = ADC_CHANNEL_15;
    
57.   sConfig.Rank = ADC_REGULAR_RANK_2;
    
58.   sConfig.SamplingTime = ADC_SAMPLINGTIME_COMMON_2;
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59.   if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
    
60.   {
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61.     Error_Handler();
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62.   }
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63. 
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64. }
    
65. 
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66. void HAL_ADC_MspInit(ADC_HandleTypeDef* adcHandle)
    
67. {
    
68. 
    
69.   GPIO_InitTypeDef GPIO_InitStruct = {0};
    
70.   if(adcHandle->Instance==ADC1)
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71.   {
    
72.   /* USER CODE BEGIN ADC1_MspInit 0 */
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73. 
    
74.   /* USER CODE END ADC1_MspInit 0 */
    
75.     /* ADC1 clock enable */
    
76.     __HAL_RCC_ADC_CLK_ENABLE();
    
77. 
    
78.     __HAL_RCC_GPIOB_CLK_ENABLE();
    
79.     __HAL_RCC_GPIOA_CLK_ENABLE();
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80.     /**ADC1 GPIO Configuration   
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81.     PB0     ------> ADC1_IN8
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82.     PA11 [PA9]     ------> ADC1_IN15
    
83.     */
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84.     GPIO_InitStruct.Pin = GPIO_PIN_0;
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85.     GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
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86.     GPIO_InitStruct.Pull = GPIO_NOPULL;
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87.     HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
    
88. 
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89.     GPIO_InitStruct.Pin = GPIO_PIN_11;
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90.     GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
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91.     GPIO_InitStruct.Pull = GPIO_NOPULL;
    
92.     HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
    
93. 
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94.     /* ADC1 DMA Init */
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95.     /* ADC1 Init */
    
96.     hdma_adc1.Instance = DMA1_Channel1;
    
97.     hdma_adc1.Init.Request = DMA_REQUEST_ADC1;
    
98.     hdma_adc1.Init.Direction = DMA_PERIPH_TO_MEMORY;
    
99.     hdma_adc1.Init.PeriphInc = DMA_PINC_DISABLE;
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100.     hdma_adc1.Init.MemInc = DMA_MINC_ENABLE;
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101.     hdma_adc1.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;
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102.     hdma_adc1.Init.MemDataAlignment = DMA_MDATAALIGN_HALFWORD;
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103.     hdma_adc1.Init.Mode = DMA_CIRCULAR;
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104.     hdma_adc1.Init.Priority = DMA_PRIORITY_HIGH;
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105.     if (HAL_DMA_Init(&hdma_adc1) != HAL_OK)
     
106.     {
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107.       Error_Handler();
     
108.     }
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109. 
     
110.     __HAL_LINKDMA(adcHandle,DMA_Handle,hdma_adc1);
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111. 
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112.   /* USER CODE BEGIN ADC1_MspInit 1 */
     
113. 
     
114.   /* USER CODE END ADC1_MspInit 1 */
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115.   }
     
116. }

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& O& b! q3 ~( H分压公式：U1/U2=R1/R2

1. #define R0  220//分压电阻阻值
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2. #define R1  100//分压电阻阻值
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3. #define ref_vol 2800//参考电压
   
4. 
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5. 
   
6. static uint16_t get_volt(uint16_t advalue)
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7. {
   
8.     return advalue * ref_vol / 0xfff * (R0 + R1) / R0;
   
9. }

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