摘要:
This was originally published as a side bar to an article I wrote in Linux Journal , issue 110, June 2003. I found it when someone asked about what... 阅读全文
摘要:
udelay(unsigned long usecs); mdelay(unsigned long msecs);前者用软件循环指定的微妙数,后者调用前者达到延迟毫秒级。udelay 函数只能用于获取较短的时间延迟,因为loops_per_second值的精度只有8位,所以,当计算更长的延迟时... 阅读全文