S3C2440的PWM定时器的驱动，并写了2个测试实例，一个是PWM驱动蜂鸣器不通的频率叫，一个是纯定时功能。已在真机通过测试。-The PWM timers of the drive S3C2440, and wrote two test cases, one is the frequency of PWM drive buzzer barrier called a pure timing. Has been tested in th