任务1：编写程序，从PA口输入开关量，由PB口输出，通过发光二极管指示其状态。

任务2：由电位器电路板分压获得模拟信号，输入到ADC0809的IN0通道，编写程序，将得到的AD转换结果保存到内部RAM中。-Task 1: programming, input from the PA port switch by PB ​ ​ output by light-emitting diodes indicate their status.

Task 2: by the potentiometer circuit board partial pressure to obtain an analog signal input to the channel of the ADC0809 IN0, the preparation process, the AD conversion result will be saved to the internal RAM.