CD1865 datasheet(92/150 Pages) INTEL

92 / 150 page

CD1865 — Intelligent Eight-Channel Communications Controller

Datasheet

// Signal to the CD1865 that the current

interrupt

// Service is concluded.

return;

}

Transmit Interrupt Service

Service_Tx(unsigned char chan)

{

unsigned char

channel, vector,c;

int i;

vector= Read_Byte(0x85);

// Perform hardware acknowledge

channel = Read_Byte(GSCR1) >> 2;

if (channel==chan){

// Make sure correct channel

for (i=1; i<= 8 && !quit_tx ; i++){

Set_Byte(TDR, txm_str[tx_ptr[chan]++] );

if (tx_ptr[chan] >= strlen(txm_str) ){

tx_ptr[chan] = 0; // Reset the pointer back to the

quit_tx = 1;

}

}//for

}//if

else

Tx_chan_err = 1;

// Wrong transmitting channel.

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 signal to the

// CD1865 that the current interrupt service

// Is concluded.

return;

}

Modem Interrupt Service

Service_Mdm()

{

unsigned char channel, vector;

vector = Read_Byte(MRAR);

// Software acknowledge using MRAR

//vector = Read_Byte(0x81);

// Comment out the previous line, if using

// hardware acknowledge.

channel = Read_Byte(GSCR1) >> 2;

switch(Read_Byte(MCR)&0xe0)

{

case 32:

// case of CTS change interrupt

{

printf(" CTR has a changed state. \n");

break;

}

case 64:

// case of CD change interrupt

{

printf(" CD has a changed state.\n");

break;

CD1865 Datasheet(PDF) 92 Page - Intel Corporation

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