CD1865 datasheet(91/150 Pages) INTEL

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Intelligent Eight-Channel Communications Controller — CD1865

Datasheet

if (int_status & 0x02)

Service_Mdm();

} //while

outportb(S8259, EOI);

/* End of Interrupt */

outportb(S8259, RDISTAT);

/* Next access read the IS Reg. */

if ( !inportb(S8259) )

/* while the slave is not serving any int. */

outportb(M8259, EOI);

/* issue End of Int. (EOI) to master */

Once the interrupt source has been determined, the request must be serviced by issuing an IACKIN

signal to the device with the preprogrammed PILR match value supplied as the address. A receive

interrupt acknowledge cycle might be written as shown. Immediately following the write to the

EOIR register to terminate the current interrupt context, the 8259A must be informed that the

service is over. This is done by the simple procedure shown at the end of the interrupt source

determination routine above.

Receive Interrupt Service

Service_Rx(unsigned char chan)

{

unsigned charchannel, vector, RxCount;

int

vector= Read_Byte(0x8a);

// perform hardware acknowledge

channel = Read_Byte(GSCR1) >>

RxCount=Read_Byte(RDCR);

// RDCR contains the number of byte to be

transfered.

if ((RxCount>0)&&(RxCount<=8))

{

((exception_data = Read_Byte(RCSR)) != 0)

// Receive Exception: in this

// Example, we disable receive

// Operation if detected a

receive

// Exception.

{

Set_Byte(CAR, chan);

Set_Byte(SRER, 0x00);

// Disable receive

}

else

// Normal Receive Operation:

// Receive exception.

{

if (channel==chan){

// Correct Receiving Channel

for (i=RxCount; i>0; i--){

rx_str[rx_ptr]=Read_Byte(RDR);

rx_ptr++;

}//for

}//if

else

// Incorrect Receiving Channel

Rx_chan_err = 1;

} // else

}

//if

Set_Byte(EOSRR, 0x00);

// Set Transmit End of Int Reg. The

Transmit End of

// Interrupt Register must be

written to by the

// Corresponding host

interrupt service

routine to

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