编写stm32f103c8t6利用AD采集电压信号并通过液晶屏输出

以下是基于STM32F103C8T6的AD采集电压信号并通过液晶屏输出的代码示例：

1. 首先，需要使用CubeMX配置引脚和ADC模块。将ADC通道1连接到PA1引脚。

2. 在main函数中初始化ADC，并设置为连续转换模式。

/* ADC Initialization */
ADC_HandleTypeDef hadc1;

/* Function prototypes */
static void MX_ADC1_Init(void);

/* Main function */
int main(void)
{
  /* MCU Configuration--------------------------------------------------------*/

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();

  /* Configure the system clock */
  SystemClock_Config();

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_ADC1_Init();
  MX_LCD_Init();

  /* Infinite loop */
  while (1)
  {
    /* Start ADC conversion */
    if (HAL_ADC_Start(&hadc1) == HAL_OK)
    {
      /* Wait for conversion to complete */
      if (HAL_ADC_PollForConversion(&hadc1, 100) == HAL_OK)
      {
        /* Read ADC value */
        uint16_t adc_value = HAL_ADC_GetValue(&hadc1);

        /* Convert ADC value to voltage */
        float voltage = (3.3f * adc_value) / 4096.0f;

        /* Print voltage to LCD */
        char lcd_buffer[16];
        snprintf(lcd_buffer, sizeof(lcd_buffer), "Voltage: %.2fV", voltage);
        BSP_LCD_Clear(LCD_COLOR_WHITE);
        BSP_LCD_SetTextColor(LCD_COLOR_BLUE);
        BSP_LCD_DisplayStringAt(0, LINE(5), (uint8_t *)lcd_buffer, CENTER_MODE);
      }
    }

    /* Delay for 1 second */
    HAL_Delay(1000);
  }
}

/* ADC1 init function */
static void MX_ADC1_Init(void)
{
  ADC_ChannelConfTypeDef sConfig = {0};

  /* Common config */
  hadc1.Instance = ADC1;
  hadc1.Init.ScanConvMode = ENABLE;
  hadc1.Init.ContinuousConvMode = ENABLE;
  hadc1.Init.DiscontinuousConvMode = DISABLE;
  hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;
  hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
  hadc1.Init.NbrOfConversion = 1;
  if (HAL_ADC_Init(&hadc1) != HAL_OK)
  {
    Error_Handler();
  }

  /* Configure ADC channel */
  sConfig.Channel = ADC_CHANNEL_1;
  sConfig.Rank = ADC_REGULAR_RANK_1;
  sConfig.SamplingTime = ADC_SAMPLETIME_239CYCLES_5;
  if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
  {
    Error_Handler();
  }
}

3. 在BSP_LCD.c文件中添加以下函数以支持字符串输出：

/**
  * @brief  Displays a string on the LCD.
  * @param  Xpos: specifies the X position, can be one of the following values:
  *            - LINE(0), LINE(1), LINE(2), LINE(3), LINE(4), LINE(5), LINE(6) or LINE(7)
  * @param  Ypos: specifies the Y position, can be one of the following values:
  *            - CENTER_MODE or RIGHT_MODE
  * @param  pText: pointer to string to display on LCD
  * @retval None
  */
void BSP_LCD_DisplayStringAt(uint16_t Xpos, uint16_t Ypos, uint8_t *pText, Text_AlignModeTypdef Mode)
{
  uint16_t ref_column = 1, i = 0;
  uint32_t size = 0;

  /* Get the text size */
  while (*(pText + i))
  {
    size += LCD_GetCharWidth(*(pText + i));
    i++;
  }

  /* Set the reference column position */
  if (Mode == CENTER_MODE)
  {
    ref_column = MAX_LINE_WIDTH / 2 - size / 2;
  }
  else if (Mode == RIGHT_MODE)
  {
    ref_column = MAX_LINE_WIDTH - size;
  }

  /* Send the string character by character on LCD */
  while ((*pText != 0) & (((Xpos + size) <= MAX_LINE_WIDTH) | ((Ypos + 16) <= MAX_LINE_HEIGHT)))
  {
    /* Display one character on LCD */
    BSP_LCD_DisplayChar(Xpos + ref_column, Ypos, *pText);

    /* Increment pointers */
    pText++;
    size -= LCD_GetCharWidth(*(pText - 1));
    ref_column += LCD_GetCharWidth(*(pText - 1));
  }
}

这样就可以通过液晶屏输出采集到的电压信号了。注意，由于ADC采集的是模拟信号，需要进行数字转换才能得到实际电压值。在上述代码中，使用了3.3V作为参考电压，采样精度为12位。根据公式Vref = 3.3V，N = 12，ADC_value为采集到的ADC值，可以计算出实际电压值V = Vref * ADC_value / 2^N。