1、功能说明
    1、ADC采样内部通道Vrefint
2、使用环境
    软件开发环境：  KEIL MDK-ARM V5.26.2.0
    硬件环境：      基于N32G032R8L7_STB开发
3、使用说明
    系统配置；
        1、时钟源：
                    HSI=8M,PLL=48M,AHB=48M,APB1=48M,APB2=48M,ADC CLK=48M/16,ADC 1M CLK=HSI/8,DMA CLK=48M
       2、DMA：
                    DMA_CH1通道循环模式搬运一个半字的ADC转换结果到ADCConvertedValue变量
        3、ADC：
                    ADC连续转换、软件触发、12位数据右对齐，转换通道16即内部参考电压的模拟电压数据
    使用方法：
        1、编译后打开调试模式，将变量ADCConvertedValue,添加到watch窗口观察，这个值就是Vrefint的采样值
4、注意事项
    当系统采用HSE时钟时（一般HSI也是打开的），RCC_ConfigAdc1mClk(RCC_ADC1MCLK_SRC_HSE, RCC_ADC1MCLK_DIV8)可以配置为HSE或者HSI
    当系统采样HSI时钟时（一般HSE是关闭的），RCC_ConfigAdc1mClk(RCC_ADC1MCLK_SRC_HSI, RCC_ADC1MCLK_DIV8)只能配置为HSI

1. Function description
    1. ADC samples the internal channel Vrefint

2. Use environment
    Software development environment: KEIL MDK-ARM V5.26.2.0
    Hardware environment: Developed based on the evaluation board N32G032R8L7_STB

3. Instructions for use
    System Configuration;
        1. Clock source:
                    HSI=8M, PLL=48M, AHB=48M, APB1=48M, APB2=48M, ADC CLK=48M/16, ADC 1M CLK=HSI/8, DMA CLK=48M
        2. DMA:
                    DMA1_CH1 channel is configuered as circular mode, carries a half-word ADC conversion result to ADCConvertedValue variable
        3. ADC:
                    ADC configuration: continuous conversion, software trigger, 12-bit data right-aligned, conversion channel 16 is the analog voltage data of the internal reference voltage
    Instructions:
        1. Open the debug mode after compiling, add the variables ADCConvertedValue to the watch window for observation，This value is the Vrefint sample value
4. Matters needing attention
    When the system uses the HSE clock (HSI is generally enabled), ), RCC_ConfigAdc1mClk (RCC_ADC1MCLK_SRC_HSE, RCC_ADC1MCLK_DIV8) can be configured as HSE or HSI
    When the system uses the HSI clock(HSE is generally disabled), RCC_ConfigAdc1mClk(RCC_ADC1MCLK_SRC_HSI, RCC_ADC1MCLK_DIV8) can only be configured as HSI