该代码实现背光亮度调节(PWM方式)，在s3x6410上验证没有问题,backlight control(PWM)

基于wince的底层驱动，用于生成dll的原始代码，本程序主要针对于sangsumg6410BUZZER的驱动当然也包括pwm的驱动-Based on the underlying drivers wince, the original code used to generate the dll, the program aimed at sangsumg6410BUZZER drivers of course, include the driver pwm