Rockwell Automation D17846.2.4 CONTROLNET KT EMULA - Manual (Page 32)

1784-6.2.4 - September 1997
A-2 Example Code for Polled and Interrupt Messaging
Example Code for Polled
Messaging The following example code shows how to setup for polled messag-
ing over the dual-port.
/* reset the card */
outportb( H186RESET, 0);
outportb( HRESETON, 0);
/* start the card */
outportb( HRESETOFF, 0);
outportb( H186RUN, 0);
/* wait a bit for the card to initialize itself */
delay(4000);
/* Load initialization string into the kt dualport */
cprintf("\r\nStarting up emulation mode...wait 1/2 second\r\n");
pDP->comm.unused1[0] =0xC3;
pDP->comm.unused1[1] =0x00;
pDP->comm.unused1[2] =0x00;
pDP->comm.unused1[3] =0x00;
pDP->comm.online =0x00;
pDP->comm.nodeaddr =0x08;
pDP->comm.shutdown_trig =0x00;
*pRUN=1;
cprintf("Heartbeat:%2d,Run:%2d\r",pDP->comm.heartbeat,*pRun,*pReset);
delay(500);
/* monitor heartbeat flag for transition to 2 */
pHBPrev = pDP->comm.heartbeat;
while (pDP->comm.heartbeat !=2
{
if (pHBPrev != pDP->comm.heartbeat)
{
cprintf("\r\n Heartbeat: %2d, Run %2d, Stop %2d\r",pDP->comm.heartbeat,*pRun,
*pReset); pHBPrev = pDP->comm.heartbeat;
}
}
/* transmit 10 id host and status */
/* make sure we have the send flags (must be 0) */
if ((pDP->comm.send.shake1 !=1) || (pDP->comm.send.shake2 !=1))
{
cprintf("Critical Error: Send box not available\r\n");
exit(0);
}
cprintf("Transmit 10 packets of ID Host and Status \r\n");
for (i=0; i < 10; ++i)
{
/* wait for the send box to be available */
while ((pDP->comm.send.shake1 != 1) && (pDP->comm.send.shake2 ! = 1))
{
}
/* place an id host and stat message into the dualport */
pDP->comm.send.len = 11;
pDP->comm.send.dst = 1;
pDP->comm.send.lsap = 0;
memcpy(&pDP->comm.send.data.[0],abIDHost,sizeof(abIDHost);
/* release the send box */
pDP->comm.send.shake2 = 0;
pDP->comm.send.shake1 = 0;
/* wait for the response message */
while ((pDP->comm.rev.shake1 !=1) && (pDP->comm.rev.shake2 !=1))
{
}
/* Print the response out */
ptr = pDP->comm.rev.data;
cprintf("Response %2d: -,i);
for (j=0; j < pDP->comm.rev.len.; ++j)
{
cprintf("%02X", *(ptr+j));
}
cprintf("\n\r");
/* release the receive box */
pDP->comm.rev.shake2 = 0;
pDP->comm.rcv.shake1 = 0;
}