在DSP671x上使用Timer統計訊號處理演算法的時間消耗

代碼執行個體

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上定時器的一個計數值對應4個刻度。

overhead表示Timer本身配置過程的時鐘消耗，所以有diff計算，

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