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
代码实例
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hTimer = TIMER_open(TIMER_DEVANY,0); /* open a timer */
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/* Configure the timer. 1 count corresponds to 4 CPU cycles in C67 */
6 y  g5 o0 d8 ~/ D8 q1 R3 R/* control period initial value */
TIMER_configArgs(hTimer, 0x000002C0, 0xFFFFFFFF, 0x00000000);
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2 d" E5 Q9 |: M$ M6 r( P/* Compute the overhead of calling the timer. */
start = TIMER_getCount(hTimer); /* to remove L1P miss overhead */
/ L$ {. |5 w& ^1 z3 Lstart = TIMER_getCount(hTimer); /* get count */
3 a, o% E" B2 i" ^stop = TIMER_getCount(hTimer); /* get count */

overhead = stop - start;
' n2 l; x* a* ?7 l' T( j2 ?, lstart = TIMER_getCount(hTimer); /* get count */
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, K  S$ V8 ], t  \6 F! Y3 M/* Call a function here. */
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* D" I# Y3 z! T9 G* Y. f: j- K0 }+ N/* get count */
diff = (TIMER_getCount(hTimer) – start) ? overhead;
. `& {" l# A; |! u# F8 ~/ W% wTIMER_close(hTimer);
printf(”%d cycles \n”, diff*4);

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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