
Programming
19
AXB-DTMF+ DTMF+ Interface
(* CONSTANT DEFINITIONS GO BELOW *)
(*********************************************************************)
DEFINE_CONSTANT
(*********************************************************************)
(* VARIABLE DEFINITIONS GO BELOW *)
(*********************************************************************)
DEFINE_VARIABLE
STATE (* STATE OF THE SOFTWARE "STATE MACHINE" *)
BUSY_COUNT (* NUMBER OF RETRIES *)
(*********************************************************************)
(* LATCHING DEFINITIONS GO BELOW *)
(*********************************************************************)
DEFINE_LATCHING
(*********************************************************************)
(* MUTUALLY EXCLUSIVE DEFINITIONS GO BELOW *)
(*********************************************************************)
DEFINE_MUTUALLY_EXCLUSIVE
(*********************************************************************)
(* STARTUP CODE GOES BELOW *)
(*********************************************************************)
DEFINE_START
BUSY_COUNT=0
STATE=255 (* ESSENTIALLY "NO STATE" *)
(*********************************************************************)
(* THE ACTUAL PROGRAM GOES BELOW *)
(*********************************************************************)
DEFINE_PROGRAM
(*********************************************************************)
(* IF KEY 1 ON THE KEYPAD IS PUSHED, PLACE THE *)
(* CARD ON HOOK (IN CASE IT WAS OFF-HOOK). *)
(* WAIT 2 SECONDS BEFORE CHANGING STATE TO *)
(* STATE 2. *)
(*********************************************************************)
PUSH[128,1] (* 1 * )
{
SEND_COMMAND DTMF_CARD,'ON HOOK'
WAIT 20
STATE=2
}
(*********************************************************************)
(* TAKE THE CARD OFF-HOOK. WAIT 2 SECONDS *)
(* FOR DIAL TONE. IF IT IS ( NOT RECEIVED, SEND AN *)
(* ERROR MESSAGE AND SHUT DOWN (GO TO ( "NO STATE"). *)
(*********************************************************************)
Continued