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
代码实例

hTimer = TIMER_open(TIMER_DEVANY,0); /* open a timer */

$ D2 n; t+ v  T9 _, S4 W9 X9 m6 ?/* Configure the timer. 1 count corresponds to 4 CPU cycles in C67 */
8 Z% a$ i' k* E7 b  N/* control period initial value */
! C: |' T' B# a0 H  H5 HTIMER_configArgs(hTimer, 0x000002C0, 0xFFFFFFFF, 0x00000000);
" \9 N; k& u$ W1 t7 c
/* Compute the overhead of calling the timer. */
, \7 R1 Z  @( ?5 nstart = TIMER_getCount(hTimer); /* to remove L1P miss overhead */
start = TIMER_getCount(hTimer); /* get count */
stop = TIMER_getCount(hTimer); /* get count */
' J4 n; T1 w3 T" z% P
overhead = stop - start;
start = TIMER_getCount(hTimer); /* get count */
9 C: m" w/ O( Z$ z7 t
  D) Q6 k& }( z% G: U/ b8 W/* Call a function here. */

3 a- g9 Q" a- d+ k/* get count */
8 _) a" F. L' ?; hdiff = (TIMER_getCount(hTimer) – start) ? overhead;
TIMER_close(hTimer);
printf(”%d cycles \n”, diff*4);

4 N  O; y* ]/ \( x/ Y6 ]3 O1 g; T) H& F
, z) |$ D! Q( \" L# N

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；
/ w1 x9 ^* W0 q3 Q
, g1 N/ w" C2 ]  i, V

wu68aq

谢谢楼主分享