irqmask=inportb(A1_8259+1);
outportb(A1_8259+1,irqmask & 0xff ^ (1<<wIrq)); setvect(wIrq+8,irq_service);
}
else
{
irqmask=inportb(A1_8259+1);
outportb(A1_8259+1,irqmask & 0xfb);/* IRQ2 */ irqmask=inportb(A2_8259+1);
outportb(A2_8259+1,irqmask & 0xff ^
}
outportb(wBase+5,1); | /* enable interrupt (PC0) | */ |
now_int_state=0; | /* now ini_signal is low | */ |
outportb(wBase+0x2a,1); | /* select the | */ |
enable(); |
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|
} |
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void interrupt irq_service() |
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{ | /* now PC0 change to low | */ |
if (now_int_state==1) | ||
{ | /* INT_CHAN_0 = !PC0 | */ |
if ((inportb(wBase+7)&1)==0) | /* PC0 still fixed in low | */ |
{ | /* need to generate a high pulse */ | |
outportb(wBase+0x2a,1); | /* INV0 select noninverted input */ | |
now_int_state=0; | /* now PC0=low | */ |
} | /* now PC0=High | */ |
else now_int_state=1; | ||
} | /* now PC0 change to high | */ |
else | ||
{ | /* INT_CHAN_0 = PC0 | */ |
COUNT++; | /* PC0 still fixed in high | */ |
if ((inportb(wBase+7)&1)==1) | ||
{ | /* need to generate a high pulse */ | |
outportb(wBase+0x2a,0); | /* INV0 select inverted input | */ |
now_int_state=1; | /* now PC0=high | */ |
} | /* now PC0=low | */ |
else now_int_state=0; | ||
} |
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if (wIrq>=8) outportb(A2_8259,0x20); outportb(A1_8259,0x20);
}