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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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+ z+ q. V' w0 k E, u- lhTimer = TIMER_open(TIMER_DEVANY,0); /* open a timer */7 o3 C6 P l! u% D4 f" X) o {. q
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/* Configure the timer. 1 count corresponds to 4 CPU cycles in C67 */$ w5 Y* B! O0 D v
/* control period initial value */
) L6 V! Z( q2 Z' a+ D8 ETIMER_configArgs(hTimer, 0x000002C0, 0xFFFFFFFF, 0x00000000);
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/* Compute the overhead of calling the timer. */
& l5 b+ T9 D2 `3 `, n! K6 @! i0 E: ~start = TIMER_getCount(hTimer); /* to remove L1P miss overhead */6 B$ w& K# E% y6 k: d! i
start = TIMER_getCount(hTimer); /* get count */4 F3 U3 e# o& ]4 v9 R; C. l
stop = TIMER_getCount(hTimer); /* get count */5 V( T1 X C+ O6 g. B
, {( H( l7 f: e& w: _& f4 aoverhead = stop - start;; |* F- Y5 [7 {. A) `8 w
start = TIMER_getCount(hTimer); /* get count */9 g: c* z- a6 I: K2 D+ k9 d
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/* Call a function here. */2 h8 r2 c+ a. f3 v/ p
4 T: Y* a$ T, ~3 v/* get count */
; ^; ?& l9 [% V" E. L8 Kdiff = (TIMER_getCount(hTimer) – start) ? overhead;
; ]" F! F) }2 `" L8 XTIMER_close(hTimer);
; G" S5 S) q0 S1 j6 o9 Q; h8 Jprintf(”%d cycles \n”, diff*4);# e! |* v& f, r- R+ T
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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；, v& ?/ }# ^+ C9 a: G0 J
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发表于 2019-2-13 06:30
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