ST—LINKIII三合一：一个ADC电压采集，并把采集值赋给定时器，实现定时器PWM的变化输出，驱动LED亮度发生变化的程序-ST-LINKIII three-in-one: A voltage ADC acquisition, and acquisition value assigned to the timer, PWM timer to achieve the changes in output, driven LED brightness changes in procedures