在DSP671x上使用Timer统计信号处理算法的时间消耗

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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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% F7 e; B% q& }/ U- Q- ?hTimer = TIMER_open(TIMER_DEVANY,0); /* open a timer */

/* Configure the timer. 1 count corresponds to 4 CPU cycles in C67 */
. c: `* o( k0 O; n7 A; _/* control period initial value */
TIMER_configArgs(hTimer, 0x000002C0, 0xFFFFFFFF, 0x00000000);
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/* Compute the overhead of calling the timer. */
$ {6 m8 Y$ l* _! F$ G9 Ostart = TIMER_getCount(hTimer); /* to remove L1P miss overhead */
start = TIMER_getCount(hTimer); /* get count */
, {9 g* l6 G' A* _( ^2 Bstop = TIMER_getCount(hTimer); /* get count */
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* M& l7 B8 q( ^* A8 ]7 m, n$ Coverhead = stop - start;
7 J; i4 C+ R' b4 r% _  estart = TIMER_getCount(hTimer); /* get count */

8 ^8 k% G( v# Z- \3 P/* Call a function here. */
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/* get count */
1 n% l9 h3 T+ F% ]3 Zdiff = (TIMER_getCount(hTimer) – start) ? overhead;
TIMER_close(hTimer);
2 z6 a! a# b; }* P, iprintf(”%d cycles \n”, diff*4);
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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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