timer 是这样用吗？ 请大家指教 ^_^ timer, 指教

smallily

我运行了这个程序后，没有按每秒打印，而是打印速度超级快！  这是为什么呀 ？

luoxf7

na_timer1->np_timerstatus = 0; 这一行是将状态寄存器清零的，怎么能屏蔽掉呢？

smallily

#include "nios.h"

int main(void)
{       int t = 0; // Set timer for 1 second

    na_timer1->np_timerperiodl = (short)(nasys_clock_freq & 0x0000ffff);      
    na_timer1->np_timerperiodh = (short)((nasys_clock_freq >> 16) & 0x0000ffff); // Set timer running, looping, no interrupts
    na_timer1->np_timercontrol = np_timercontrol_start_mask+ np_timercontrol_cont_mask; // Poll timer forever, print once per second
        while(1)
     {
       if(na_timer1->np_timerstatus & np_timerstatus_to_mask)
         {   printf("A second passed! (%d)\n",t++); // Clear the to (timeout) bit na_timer1->np_timerstatus = 0; // (any value)
         }
        }
}
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smallily

o ,多谢多谢  ！ ^_^