lunux驱动之延时的另一种实现方式

1.忙等待延时2s

unsigned long delay =jiffies +2*HZ;

while(time_before(jiffies,delay));

2.延时100个jiffies  ，jiffies=1s/HZ  ，HZ是内核里的一个常数，通常为100或1000

unsigned long delay =jiffies +100;

while(time_before(jiffies,delay));

3.延时n毫秒 mdelay(n) 或

unsigned long delay =jiffies +n*HZ/1000;

while(time_before(jiffies,delay));

4.头文件

#include