通过ADC通道16，采集内部温度传感器输出电压值和温度值，具体程序如下：

adc.h文件

#ifndef USER_ADC_H_
#define USER_ADC_H_

void ADC_Function_Init(void);
u16 Get_ADC_Val(u8 ch);
u16 Get_ADC_Average(u8 ch, u8 times);
u16 Get_ConversionVal(s16 val);

#endif /* USER_ADC_H_ */

adc.h文件主要是函数的声明.
adc.c文件

#include "debug.h"

/* Global Variable */
s16 Calibrattion_Val = 0;

/*********************************************************************
 * @fn      ADC_Function_Init
 *
 * [url=home.php?mod=space&uid=2666770]@Brief[/url]   Initializes ADC collection.
 *
 * [url=home.php?mod=space&uid=1141835]@Return[/url]  none
 */
void ADC_Function_Init(void)
{
    ADC_InitTypeDef  ADC_InitStructure = {0};
    GPIO_InitTypeDef GPIO_InitStructure = {0};

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
    RCC_ADCCLKConfig(RCC_PCLK2_Div8);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    ADC_DeInit(ADC1);
    ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
    ADC_InitStructure.ADC_ScanConvMode = DISABLE;
    ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
    ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
    ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
    ADC_InitStructure.ADC_NbrOfChannel = 1;
    ADC_Init(ADC1, &ADC_InitStructure);

    ADC_Cmd(ADC1, ENABLE);

    ADC_BufferCmd(ADC1, DISABLE); //disable buffer
    ADC_ResetCalibration(ADC1);
    while(ADC_GetResetCalibrationStatus(ADC1));
    ADC_StartCalibration(ADC1);
    while(ADC_GetCalibrationStatus(ADC1));
    Calibrattion_Val = Get_CalibrationValue(ADC1);

    ADC_BufferCmd(ADC1, ENABLE); //enable buffer

    ADC_TempSensorVrefintCmd(ENABLE);
}

/*********************************************************************
 * @fn      Get_ADC_Val
 *
 * @brief   Returns ADCx conversion result data.
 *
 * [url=home.php?mod=space&uid=3142012]@param[/url]   ch - ADC channel.
 *            ADC_Channel_0 - ADC Channel0 selected.
 *            ADC_Channel_1 - ADC Channel1 selected.
 *            ADC_Channel_2 - ADC Channel2 selected.
 *            ADC_Channel_3 - ADC Channel3 selected.
 *            ADC_Channel_4 - ADC Channel4 selected.
 *            ADC_Channel_5 - ADC Channel5 selected.
 *            ADC_Channel_6 - ADC Channel6 selected.
 *            ADC_Channel_7 - ADC Channel7 selected.
 *            ADC_Channel_8 - ADC Channel8 selected.
 *            ADC_Channel_9 - ADC Channel9 selected.
 *            ADC_Channel_10 - ADC Channel10 selected.
 *            ADC_Channel_11 - ADC Channel11 selected.
 *            ADC_Channel_12 - ADC Channel12 selected.
 *            ADC_Channel_13 - ADC Channel13 selected.
 *            ADC_Channel_14 - ADC Channel14 selected.
 *            ADC_Channel_15 - ADC Channel15 selected.
 *            ADC_Channel_16 - ADC Channel16 selected.
 *            ADC_Channel_17 - ADC Channel17 selected.
 *
 * @return  none
 */
u16 Get_ADC_Val(u8 ch)
{
    u16 val;

    ADC_RegularChannelConfig(ADC1, ch, 1, ADC_SampleTime_239Cycles5);
    ADC_SoftwareStartConvCmd(ADC1, ENABLE);

    while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC));

    val = ADC_GetConversionValue(ADC1);

    return val;
}

/*********************************************************************
 * @fn      Get_ADC_Average
 *
 * @brief   Returns ADCx conversion result average data.
 *
 * @param   ch - ADC channel.
 *            ADC_Channel_0 - ADC Channel0 selected.
 *            ADC_Channel_1 - ADC Channel1 selected.
 *            ADC_Channel_2 - ADC Channel2 selected.
 *            ADC_Channel_3 - ADC Channel3 selected.
 *            ADC_Channel_4 - ADC Channel4 selected.
 *            ADC_Channel_5 - ADC Channel5 selected.
 *            ADC_Channel_6 - ADC Channel6 selected.
 *            ADC_Channel_7 - ADC Channel7 selected.
 *            ADC_Channel_8 - ADC Channel8 selected.
 *            ADC_Channel_9 - ADC Channel9 selected.
 *            ADC_Channel_10 - ADC Channel10 selected.
 *            ADC_Channel_11 - ADC Channel11 selected.
 *            ADC_Channel_12 - ADC Channel12 selected.
 *            ADC_Channel_13 - ADC Channel13 selected.
 *            ADC_Channel_14 - ADC Channel14 selected.
 *            ADC_Channel_15 - ADC Channel15 selected.
 *            ADC_Channel_16 - ADC Channel16 selected.
 *            ADC_Channel_17 - ADC Channel17 selected.
 *
 * @return  val - The Data conversion value.
 */
u16 Get_ADC_Average(u8 ch, u8 times)
{
    u32 temp_val = 0;
    u8  t;
    u16 val;

    for(t = 0; t < times; t++) {
        temp_val += Get_ADC_Val(ch);
        Delay_Ms(5);
    }

    val = temp_val / times;

    return val;
}

/*********************************************************************
 * @fn      Get_ConversionVal
 *
 * @brief   Get Conversion Value.
 *
 * @param   val - Sampling value
 *
 * @return  val+Calibrattion_Val - Conversion Value.
 */
u16 Get_ConversionVal(s16 val)
{
    if((val + Calibrattion_Val) < 0)
        return 0;
    if((Calibrattion_Val + val) > 4095)
        return 4095;
    return (val + Calibrattion_Val);
}

通过以上配置，即可ADC值进行读取。

main.c文件

#include "debug.h"
#include "iic.h"
#include "oled.h"
#include "ADC.h"
/* Global typedef */

/* Global define */

/* Global Variable */

/*********************************************************************
 * @fn      main
 *
 * @brief   Main program.
 *
 * @return  none
 */

int main(void)
{
//    uint16_t i = 0;

    IIC_Init(800000, 0x78);
    OLED_Init();
  OLED_Clear(0);


    OLED_ShowString(20,0,"CH32V208 TEST",16);

      u16 ADC_val;
      s32 val_mv;

      Delay_Init();

      ADC_Function_Init();

      while(1)
      {
          ADC_val = Get_ADC_Average(ADC_Channel_TempSensor, 10);
          Delay_Ms(500);

          ADC_val = Get_ConversionVal(ADC_val);
          OLED_ShowNum(20,4,ADC_val,8,16);// printf("ADC-Val:%04d\r\n", ADC_val);

          val_mv = (ADC_val * 3300 / 4096);
          OLED_ShowNum(20,6,TempSensor_Volt_To_Temper(val_mv),8,16);
          //printf("mv-T-%d,%0d\n", val_mv, TempSensor_Volt_To_Temper(val_mv));

          Delay_Ms(2);
      }
}

main.c文件主要进行相关函数的初始化以及输出通过ADC_IN1读取到的ADC值。