开发环境：ADS。测试IO口，根据原理图可知，DS2-DS5是分别由IO口PB19-PB22控制的4个LED灯，通过对LED灯的操作，来测试IO口性能。-Development Environment: ADS. IO mouth test, according to schematic diagram, we can see, DS2-DS5 respectively by the IO port PB19-PB22 control four LED lights, LED lights th