基于QT2.3.0编写的，pwm控制蜂鸣器的示例代码。 在linux2.6.29+Qtopia-2.2.0下编译通过，并在友善之臂mini2440下成功运行。所用芯片三星s3c2440-Based on QT2.3.0 prepared, pwm control the buzzer of the sample code. In linux2.6.29+ Qtopia-2.2.0 compiled by, and in a friendly, under the arm mini2440 r