Introduction

There are times where you need your devices to be available all the time. The problem is that when slave times out (and schedules @IDLE) it unregisters the slave service, leading to a non available time which depending on your case can be to long.

Details

In those cases you can do a little trick like this:

@IDLE 20
20 A = slave 15
21 ALARM 1
22 RETURN

@ALARM 100
100 ....
110 A = slave 15
111 ALARM 8
112 RETURN

With this trick you make sure that the slave service is registered all the time. The problem with this is that you will not get @IDLE anymore, except when a connection is closed. In this cases is @IDLE the one that starts the schedules the alarms again, and registers the slave service as soon as possible.

There's still a problem with this. A long call to slave (slave 15 in this case line 20) when @IDLE is called after @INIT has finished, can make the processor to malfunction and delete the slave service, giving the exactly opposite result from what you were willing to get.

But that last problem is very easy to handle, you just need a variable that takes a state when you are booting, and then change it's status once you know you had all ready passed the boot stage.

Code

I don't bother anymore with comments, here's the code: Download

@ERASE

@INIT 9
9 Z = 1
10 J = 10
0 REM LED output and on
11 A = pioout J
12 A = pioset J

0 REM set baud rate to 115200
13 A = baud 1152

14 A = zerocnt

0 REM set name
15 $0="AIRcableSlave "
16 A = getuniq $2
17 PRINTV $2
18 A = name $0
19 G = 1
20 U = 1
21 WAIT 3
22 RETURN

@SLAVE 40
0 REM blue LED on
40 B = pioset J
0 REM connect RS232
41 C = link 1
42 WAIT 5
43 A = disconnect 0
44 RETURN

0 REM IDLE only calls to slave
0 REM leds are handled by the alarm
@IDLE 50
50 IF U = 1 THEN 52
51 A = slave 15
52 ALARM 1
53 U = 0
54 RETURN

@ALARM 190
190 A = status;
191 IF A = 0 THEN 200
192 GOTO 203

0 REM blink blue LED
200 A = pioset 10
201 A = pioclr 10
202 A = slave 15
203 IF G = 1 THEN 210
204 ALARM 8
205 RETURN

210 A = readcnt
211 IF A < 120 THEN 204
212 A = disable 3
213 G = 0
214 GOTO 204