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在DSP671x上使用Timer统计信号处理算法的时间消耗.md

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代码实例

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

/* Configure the timer. 1 count corresponds to 4 CPU cycles in C67 */
/* control period initial value */
TIMER_configArgs(hTimer, 0x000002C0, 0xFFFFFFFF, 0x00000000);

/* Compute the overhead of calling the timer. */
start = TIMER_getCount(hTimer); /* to remove L1P miss overhead */
start = TIMER_getCount(hTimer); /* get count */
stop = TIMER_getCount(hTimer); /* get count */

overhead = stop - start;
start = TIMER_getCount(hTimer); /* get count */

/* Call a function here. */

/* get count */
diff = (TIMER_getCount(hTimer) – start) ? overhead; 
TIMER_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; /* get count */