fdriver.h

linux下利用usb转换为串口的驱动

#define DEBUG
#ifdef DEBUG
#define MSG(string, args...) printk(KERN_DEBUG \
“schar:__FILE__-__LINE__:” string, ##args)

#else
#define MSG(string, args...)
#endif
#define SCHAR_MAJOR 42
#define SCHAR_IOCTL_BASE     0xbb
#define SCHAR_TOGGLE_DEBUG   _IO(SCHAR_IOCTL_BASE, 0)
#define SCHAR_GET_POOL       _IOR(SCHAR_IOCTL_BASE, 1, unsigned long)
#define SCHAR_EX_TIMER_DELAY _IOWR(SCHAR_IOCTL_BASE, 5, unsigned long)