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用的是创龙的OMAP-L138的板子和XDS100v3仿真器,用的方法是TSCL = 0;
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unsigned long long start,stop,overhead;! D- m0 v! ]. F1 f* w
start = _itoll(TSCH,TSCL);( w5 k* W, O2 a$ _) W! C$ u
stop = _itoll(TSCH,TSCL); G/ S: V. c8 C$ z
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overhead = stop - start;3 _3 p- H8 n* Y A
printf("overhead run-time is %d\n",overhead);9 ^, E- ~% B. J; s
. i! o8 |- `* Y1 M' F% pstart = _itoll(TSCH,TSCL);
; Y- X) k# i2 Z//here is function
) ?7 z2 |" R9 R- x, Z: Efunction();% W. M; q* |( b d1 }* n
stop = _itoll(TSCH,TSCL);2 ^* K0 p/ O1 }$ @7 X! C$ R
printf("The function run-time time is %lu\n",(stop - start - overhead));
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为什么每次测量出来的时间都不一致?测量出来的不是一个固定的值。
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