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 Post subject: not_nested與ready_nested
PostPosted: Tue Apr 30, 2013 5:40 pm 
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Joined: Fri Mar 04, 2011 9:36 pm
Posts: 500
not_nested的ISR,如果裡面打開GIE,
是不是會和ready_nested一樣變成巢狀中斷?

not_nested原本的設計是用來執行無巢狀的中斷,
所以沒有把interrupt降階,所以如果把GIE打開,interrupt又會往上跳一層,
會造成錯誤。除非user自己要降階。
所以,巢狀中斷還是要使用ready_nested。


(下面是not_nested的example code,與本文的主題無關)
Code:
void NDS32ATTR_ISR("not_nested;id=0") HW0_ISR(void)
{
   puts("* Enter HW0 ISR with GPIO *\n");
   outw(GPIO_BASE + GPIO_IC_OFFSET, 0xFFFFFFFF);

   /* This service will take 6 secs */
   unsigned int period;
   period = (6 * (MB_PCLK / TICK_HZ)) >> SIMU_FACTOR;
   outw(TM2_LOAD, period);
   outw(TM2_CNTR, 0);
   outw(TM_CR, (inw(TM_CR) | TM_CR_TM2ENA | TM_CR_TM2UP));
   while (1) {
      unsigned int tm2_cntr = inw(TM2_CNTR);
      if (tm2_cntr > period)
         break;
   }
   puts("* End of HW0 ISR it takes 6 secs *\n");
}


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