Re: Open source CPU+open source toolchain

From	rickman <gnuarm@gmail.com>
Newsgroups	comp.lang.forth
Subject	Re: Open source CPU+open source toolchain
Date	2015-08-02 12:06 -0400
Organization	A noiseless patient Spider
Message-ID	<mplf2e$pd3$1@dont-email.me> (permalink)
References	<f77972f7-c94d-4aa2-8394-f494adbbb382@googlegroups.com> <0d5f2beb-5db0-4500-9ce9-0bed0cf566f4@googlegroups.com> <32a85e22-d091-4cb7-82ea-9aaa6a3a60f9@googlegroups.com>

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On 8/2/2015 10:55 AM, foxaudioresearch@gmail.com wrote:
> On Sunday, August 2, 2015 at 4:46:36 AM UTC-4, mfany...@gmail.com wrote:
>> Ulrich Hoffmann https://github.com/uho already demonstrated this like 9 months ago when he used a rudimentary forth that I had developed on a simulator and actually made it work in a real FPGA environment on a Papilio pro FPGA board. The potential to run a small embeddable interactive forth on a FPGA is not a new concept but the J1 CPU is an excellent candidate for this line of work due to it's minimalistic nature however when you ever need things like multitasking then the j1 becomes a wee-bit hairy to work with , that's why I stopped development on it. You can see the stuff on gitub here https://github.com/samawati/j1eforth, great contribution by Ulrich Hoffmann by the way and also to James bowman for his j1 CPU in verilog which is awesome x2 ..
>
> I read some things about multi-tasking and the J1. It is a thorny problem however is not the correct solution to add some support at the CPU level?
>
> Something like bigger stacks that could be segmented by task comes to mind.
> I think the stack rollover is a possible threat but hey Forth people know how to keep the stack under control (at least in finished code) :)
>
> Koopman indicates that you can run real Forth programs with 16 cells per stack.
>
> Would that solve the multi-tasking problem for a specific maximum number of tasks?  (ie we would not be running UNIX on the thing, just some embedded programs)

A very straight forward approach to multi-tasking is multi-processors. 
Every significant problem I have seen in embedded processing is due to a 
single processor being used to simultaneously run multiple tasks.  If 
you really require that then select a processor suitable to the job. 
With the low cost of transistors these days and the small size of stack 
processors, there is no little for difficult multi-tasking in an FPGA.

-- 

Rick

Thread

Open source CPU+open source toolchain foxaudioresearch@gmail.com - 2015-07-29 17:57 -0700
  Re: Open source CPU+open source toolchain mentificium@gmail.com - 2015-07-29 18:36 -0700
    Re: Open source CPU+open source toolchain foxaudioresearch@gmail.com - 2015-07-29 19:15 -0700
  Re: Open source CPU+open source toolchain rickman <gnuarm@gmail.com> - 2015-07-30 01:40 -0400
    Re: Open source CPU+open source toolchain foxaudioresearch@gmail.com - 2015-07-30 07:11 -0700
    Re: Open source CPU+open source toolchain Jecel <jecel@merlintec.com> - 2015-07-30 09:39 -0700
    Re: Open source CPU+open source toolchain "Rod Pemberton" <boo@fasdfrewar.cdm> - 2015-07-30 21:22 -0400
      Re: Open source CPU+open source toolchain "Elizabeth D. Rather" <erather@forth.com> - 2015-07-30 20:56 -0500
        Re: Open source CPU+open source toolchain "Rod Pemberton" <boo@fasdfrewar.cdm> - 2015-07-30 22:05 -0400
          Re: Open source CPU+open source toolchain "Elizabeth D. Rather" <erather@forth.com> - 2015-07-31 09:47 -0500
            Re: Open source CPU+open source toolchain "Rod Pemberton" <boo@fasdfrewar.cdm> - 2015-07-31 23:57 -0400
              Re: Open source CPU+open source toolchain anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2015-08-01 13:07 +0000
              Re: Open source CPU+open source toolchain "Elizabeth D. Rather" <erather@forth.com> - 2015-08-01 10:37 -0500
  Re: Open source CPU+open source toolchain mfanyikazi@gmail.com - 2015-08-02 01:46 -0700
    Re: Open source CPU+open source toolchain foxaudioresearch@gmail.com - 2015-08-02 07:55 -0700
      Re: Open source CPU+open source toolchain rickman <gnuarm@gmail.com> - 2015-08-02 12:06 -0400
        Re: Open source CPU+open source toolchain foxaudioresearch@gmail.com - 2015-08-04 08:10 -0700
          Re: Open source CPU+open source toolchain rickman <gnuarm@gmail.com> - 2015-08-04 12:05 -0400
            Re: Open source CPU+open source toolchain foxaudioresearch@gmail.com - 2015-08-04 14:21 -0700
              Re: Open source CPU+open source toolchain rickman <gnuarm@gmail.com> - 2015-08-04 18:24 -0400
      Re: Open source CPU+open source toolchain Jan Coombs <Jan-54 <jenfhaomndgfwutc@murmic.plus.com>> - 2015-08-06 09:12 +0100

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