short rtimer_arch_Now(void) { short t1,t2; do { t1 = TA1R; t2 = TA1R; } while(t1 != t2); return t1; }
TA1R是Timer_A寄存器.我仍然不知道为什么会有一个循环.如果他们想要返回时间,他们只需返回TA1R.什么是循环?