adc1_pa6_pa7_usart_stm32

代码说明：

  利用stm32的adc1，实现规则转换，检测通道pa6和pa7的电压值，并把他们的值放在数组中。串口显示数据方便调试。(Use stm32 the adc1, implement rules conversion, detection channel pa6 and pa7 voltage value, and put their values ​ ​ in an array. Serial display data to facilitate debugging.)