8253.h

编写了对微机8253芯片的驱动程序

#define DEVICE_NAME "JOY_WUDAN" 
#define Major 100
#define DEVICE_IOC_MAGIC	0xdc
#define SET_MODE	_IOW(DEVICE_IOC_MAGIC,0,int)
#define SET_FREQ 	_IOW(DEVICE_IOC_MAGIC,1,int)
#define START_BEEP  _IOW(DEVICE_IOC_MAGIC,2,int)
#define STOP_BEEP   _IOW(DEVICE_IOC_MAGIC,3,int)
#define READ_KEY    _IOR(DEVICE_IOC_MAGIC,4,int)