📄 dm9000中断子程序的一个问题？？ - china linux forum.htm
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<TD align=left width="33%"><SPAN class=catandforum><A
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高级应用</A> <BR> >> <A
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<TD class=darktable vAlign=top width="17%" rowSpan=2><A
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<P class=post>这是dm9000驱动里中断子程序的一段代码 <BR>670 reg_save =
inb(db->io_addr); <BR>671 <BR>672 /* Disable all interrupt */
<BR>673 iow(db, DM9KS_IMR, DM9KS_DISINTR); <BR>674 <BR>675 /* Got
DM9000A/DM9010 interrupt status */ <BR>676 int_status = ior(db,
DM9KS_ISR); /* Got ISR */ <BR>677 iow(db, DM9KS_ISR, int_status); /*
Clear ISR status */ <BR>678 <BR>679 /* Received the coming packet */
<BR>680 if (int_status & DM9KS_RX_INTR) <BR>681
dmfe_packet_receive(dev); <BR>682 <BR>683 /* Trnasmit Interrupt
check */ <BR>684 if (int_status & DM9KS_TX_INTR) <BR>685
dmfe_tx_done(0); <BR>686 // tasklet_schedule(&dmfe_tx_tasklet);
<BR>687 <BR>688 /* Re-enable interrupt mask */ <BR>689 iow(db,
DM9KS_IMR, DM9KS_REGFF); <BR>690 <BR>691 <BR>692 /* Restore previous
register address */ <BR>693 outb(reg_save, db->io_addr); <BR>694
<BR>695 spin_unlock(&db->lock); <BR>其中下面这两句不是很明白 <BR>676
int_status = ior(db, DM9KS_ISR); /* Got ISR */ <BR>677 iow(db,
DM9KS_ISR, int_status); /* Clear ISR status */
<BR>为什么读出ISR的状态后，又要写到ISR寄存器里面呢，难道它的状态发生变化了吗？ <BR>有知道的达人指点一下吧？
<BR><BR><BR><BR>--------------------<BR>.................
<BR>QQ:17973466
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