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哪位朋友能说一下,NiosII IDE 中alt_timestamp()函数测量时间的精度是多少?
main()函数中设置时间点部分如下: void main () { alt_u32 time1; alt_u32 time2; alt_timestamp_start() ; //开启时间标记服务 time1 = alt_timestamp(); //测量时间点1 usleep(100); time2 = alt_timestamp(); //测量时间点2 return 0; } 问题是:如果测usleep(1000),则测量误差不大。但如果测usleep(1),则显示运行此函数用22us,不是1us;如果测usleep(2),则显示运行此函数用20us,不是2us;如果测usleep(10),则显示运行此函数用27us,不是10us; 为什么?是 alt_timestamp()测时间不准,还是usleep(1)延时本身就不是1us?Link Copied
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