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ADC

（可选）配置RCC，High Speed Clock配置为Crystal/Ceramic Resonator
（可选）Clock Configuration，PLL Source Mux选择HSE，X9，System Clock Mux选择为PLLCLK，APB1 Prescaler选择/2，ADC Prescaler选择/6
给PA5选择ADC1_IN5，在Analog，ADC1中
- 配置Continuous Conversion Mode为Enable，这样转换会一直进行，不用每次手动触发
- 配置Rank - Sampling Time为239.5Cycles，这样采样时间长，数据更稳定
配置USART2，Mode配置为Asynchronous，用于输出ADC数据
先HAL_ADC_Start打开ADC转换
再通过HAL_ADC_GetValue获得ADC结果