rand.h

一款MP3 Player Firmware 的原代码,非常有参考价值

extern unsigned int rand16(void);
#pragma CALLEE-SAVES rand16

extern void restore_rand_settings(void);
extern void backup_rand_settings(void);
extern void tweak_rand_seed(void);
#pragma CALLEE-SAVES tweak_rand_seed

extern volatile xdata unsigned int rand16_seed;