Hello Matthias,
I hope that you would be interested in the following AmForth
development. I will send you the patch under a separate cover.
Regards, Enoch.
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1 Objective
------------
One of AmForth features is the ability to write interrupt service
routines (ISRs) in Forth. However, in the existing implementation
as of SVN r1423 those ISRs should run with the hardware interrupt
system (SREG I-bit) disabled. This means that one has to keep
those ISRs very short and defer long processing to the "main"
(aka user mode). The following changes to the kernel introduce an
eight level soft interrupt queue, allowing Forth ISRs to be
interruptible and thus be as slow to execute as necessary (and
even reentrant).
2 Implementation
-----------------
To the existing +int and -int ("hard front-end") words that
control the SREG I-bit the following ("soft rear-end") words were
added:
2.1 int+ ( -- ) "soft interrupts on"
=======================================
Enables the soft interrupts. By default soft interrupts are
enabled.
2.2 int- ( -- ) "soft interrupts off"
========================================
Disables the soft interrupts.
2.3 int' ( -- addr ) "soft interrupts apostrophe"
====================================================
Returns the address of a system variable where the lower byte, if
non zero, indicates the occurance of a hard interrupt
overflow. The overflow mark is the interrupting-device program
address. Clear this mark by: 0 int' c!
The higher byte, if non-zero, indicates having the soft
interrupts inhibited.
3 Compatibility
----------------
Existing code should not be affected.
------------------------------------------------------------------------------
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