hi all in C++ example, code { fd_buzzer = open("/dev/pwm",0); } works fine; but in Qtopia2.2.0 code { fd_buzzer = open("/dev/pwm",0); } produce the following error: Hello2440 was terminated due to application error (11). where is the problem? by the way, where can I find source code of pwm_testing application in mini2440 ? regards