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在DSP671x上使用Timer统计信号处理算法的时间消耗
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4 O3 f+ A9 B% x0 V) jhTimer = TIMER_open(TIMER_DEVANY,0); /* open a timer */$ w" Z& r7 U7 O u8 y6 h1 @
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/* Configure the timer. 1 count corresponds to 4 CPU cycles in C67 */! g& O: k3 h/ ~" B: \# d
/* control period initial value */4 Q) k4 Z# r, J3 Z5 @3 w
TIMER_configArgs(hTimer, 0x000002C0, 0xFFFFFFFF, 0x00000000);
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/* Compute the overhead of calling the timer. */# r1 M" J: \, d2 `
start = TIMER_getCount(hTimer); /* to remove L1P miss overhead */
) O! I' r1 n' h* J4 jstart = TIMER_getCount(hTimer); /* get count */+ n0 q8 i7 v4 x6 D$ ~" C9 D
stop = TIMER_getCount(hTimer); /* get count */
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" J1 i& {7 B( s; N! Aoverhead = stop - start;
; g& h$ Q2 [' {: \start = TIMER_getCount(hTimer); /* get count */1 s" h9 m _7 N$ J/ p5 b
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/* Call a function here. */3 P: y+ O5 E. p3 j: s7 N! ~8 _- P
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/* get count */* d% {: n. X2 j9 J$ q
diff = (TIMER_getCount(hTimer) – start) ? overhead;
$ k! }! |+ D3 YTIMER_close(hTimer);
- p5 W; @9 N% X J; ^5 aprintf(”%d cycles \n”, diff*4);. A, F# j3 q* P6 b
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注意，C6713上定时器的一个计数值对应4个时钟周期。 overhead表示Timer本身配置过程的时钟消耗，所以有diff计算， diff = (TIMER_getCount(hTimer) – start) ? overhead；
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发表于 2019-2-13 06:30
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