在DSP671x上使用Timer统计信号处理算法的时间消耗

helendcany

在DSP671x上使用Timer统计信号处理算法的时间消耗
7 M, w9 p/ N( {. K) Y1 Y! e代码实例
! F3 \; o1 J4 P- |1 H( K
hTimer = TIMER_open(TIMER_DEVANY,0); /* open a timer */

  a0 w* M0 Y/ K. W3 S9 J* Z+ E. G/* Configure the timer. 1 count corresponds to 4 CPU cycles in C67 */
/* control period initial value */
TIMER_configArgs(hTimer, 0x000002C0, 0xFFFFFFFF, 0x00000000);
6 r' j; W4 {) ~' L0 @
$ G8 M. v+ x6 {  v5 H/* Compute the overhead of calling the timer. */
start = TIMER_getCount(hTimer); /* to remove L1P miss overhead */
4 b" [0 U+ }, d0 Lstart = TIMER_getCount(hTimer); /* get count */
- z* y- a5 W9 z- pstop = TIMER_getCount(hTimer); /* get count */
! N1 h) ?. k8 E/ f- p6 y: L3 o3 C
overhead = stop - start;
9 p' T: y8 j# X+ y2 _& tstart = TIMER_getCount(hTimer); /* get count */

% d# B$ `" e! g% |) O6 `0 }; e# S+ v/* Call a function here. */
5 H; W8 F' U3 j$ _9 M- Q# t5 S5 m& n
6 q% P  G7 z. J. W/ ]+ y/* get count */
diff = (TIMER_getCount(hTimer) – start) ? overhead;
4 n( h  M6 w1 m2 \TIMER_close(hTimer);
printf(”%d cycles \n”, diff*4);
4 x% H, A* a% a' s

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；
6 f4 K# g  X( H$ ?

wu68aq

谢谢楼主分享