STM32系列 ADC 与 DAC 操作库函数，ADC采用注入序列转换模式，系统周期扫描，采用环形滤波，滤波深度可配置，应用直接读取A/D电压；(STM32 series ADC and DAC operation library function, ADC adopts injection sequence conversion mode, system cycle scanning, adopts ring filter, filtering depth can be configured,