Hi everyone,
First time positing and just wanted to compliment Matthias and the team on the
good work on amforth.
Now onto my main issue...
I’ve recently run into amforth and have so far had a good experience with it
and getting it to work with LEDs and some spi devices.
Recently, I thought I might try out multitasking but ran into some issues;
“multi” hangs my system.
HW: I’m running it on an ATmega328 processor (in DIP format on a breadboard).
I have a simple program to initialize the PB1 pin (on which I have an LED) as
an output and to toggle its voltage output level. This is known to work without
multitasking.
The amforth-6.4/common/lib/multitask-test.frt file was the template from which
I worked. The “multitask.frt” file has already been loaded.
Here’s the file I send to the microcontroller via amforth-upload.py:
******************************************************************************
testA1
marker testA1
: ms ( n -- ) 0 ?do pause 1ms loop ; \ call pause on wait
;
: init
led0_gpio_init
;
: run-demo
begin
led0_toggle
#500 ms
again
;
$20 $20 $10 task: task_demo
: start-demo
task_demo tib>tcb activate
\ words after this line are run in the new task
run-demo
;
: starttasker
task_demo task-init
start-demo
onlytask
task_demo tib>tcb alsotask
multi
;
: run-turnkey
applturnkey
init
starttasker
;
******************************************************************************
System hanged in “starttasker”. Upon closer inspection I found the hang in
“multi”.
A quick run of “ task_demo task-init start-demo onlytask task_demo tib>tcb
alsotask ” at the prompt,
followed by “tasks" gives the following which suggests the tasks are properly
setup at 0x17B and 0x1AB.
******************************************************************************
ok
> amforth 6.4 ATmega328P
> hex
ok
> tasks
17B unknown
> task_demo task-init start-demo onlytask task_demo tib>tcb alsotask
ok
> tasks
17B running
1AB running
Multitasker is not running ok
> single
ok
> tasks
17B running
1AB running
Multitasker is not running ok
>
******************************************************************************
If I execute "multi” at this point, the system just hangs and only recovers
with a manual reset.
I find it interesting that “single” executes fine but “multi” hangs given that
they look quite similar:
: single ( -- )
['] noop ['] pause defer!
;
: multi ( -- )
['] multitaskpause ['] pause defer!
;
It may hint that something may be amiss in “multitaskpause”. Mine looks like
this:
: multitaskpause ( -- ) rp@ sp@ sp ! follower @ dup @ i-cell+ >r ;
If you have any pointers on how to solve this, I’d be grateful if you’d share.
Regards,
Frank
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