My ongoing troubles with using the ax5214h driver with an Acess DIO-48 card
may be of assistance to some others.
I checked the Axiom manual for the card, and discovered that the three
most significant bits of the 8255 control reg. were pre-empted in some way
on the board. This resulted in " dont care" status for those 3 bits. the
Acess board uses the full register set of the 8255, So a simple mod to the
driver:
Snip;
====================================
msg = rtapi_get_msg_level();
rtapi_set_msg_level(RTAPI_MSG_WARN);
retval = 0;
config = 0; ( CHANGE TO: config = 0x80; )
dir = board->dir_bits & 0x01;
retval += export_port ( boardnum, 0, &(board->port_1A[0]), 8, dir );
if ( dir == 0 ) {
config |= 0x10;
=====================================
set the msb of the control port to allow direction configuration of ports
a,b and c. ( do the same for second chip )
IT WORKS!!
Only trouble was: when I used halrun, and loadrt hal_ax5214h etc. etc,
all the outputs came on.
after making thread, addf etc, start, they react normally. ( frantic time
trying to remember what to do as the power was
temporarily on the i/o for testing )
So back to the drawing board. The 8055 defaults to all inputs on
power-up/reset , probably can't write to inputs,
So - - - - a simple mod to the driver:
Snip;
=====================================
/* initialize hardware - all outputs high
(since outputs are active low) */
( NEW ) outb(board->port1config, board->base_addr+3);
outb(0xff, board->base_addr+0);
outb(0xff, board->base_addr+1);
outb(0xff, board->base_addr+2);
( OLD ) outb(board->port1config, board->base_addr+3);
( NEW ) outb(board->port2config, board->base_addr+7);
outb(0xff, board->base_addr+4);
outb(0xff, board->base_addr+5);
outb(0xff, board->base_addr+6);
(OLD ) outb(board->port2config, board->base_addr+7);
/* restore saved message level */
rtapi_set_msg_level(msg);
return retval;
}
=====================================
Place the control register write before the initialisation bits. ( I guess )
remove the old, and replace with the new lines. ( out with the old and in
with the new ? )
IT WORKS! Really works, all outputs are off on loading the driver, all i/o
is as it is configured.
My compile method? download source and GCC etc. and compile the whole
shebang !!
Aboriginal sledgehammer approach. But it works! (git er done
) Perserverance pays.
( It might be interesting if someone with the Axiom card found out what
happens when they load the driver )
hope all this helps someone.
Dave
Dave B.
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