[chbot] Chchrobotics Digest, Vol 97, Issue 2
Henry Allison
hcf_allison at yahoo.com
Mon Oct 5 16:01:04 BST 2015
I presume Mark is going to be speaking at the BR05 monthly general meeting this Wednesday (always on first Wednesday of the month) at Idris Rd. I will probably attend. Can you confirm, Mark?
Henry Allison
On Sunday, 4 October 2015 12:00 AM, "chchrobotics-request at lists.linuxnut.co.nz" <chchrobotics-request at lists.linuxnut.co.nz> wrote:
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Today's Topics:
1. Re: Most puzzling arm compilation problem [SOLVED] (Robin Gilks)
2. [Off Topic] Wed, BR05 talk - Digital Amateur TV talk
(Mark Atherton)
3. Re: [Off Topic] Wed, BR05 talk - Digital Amateur TV talk
(Richard Jones)
4. Re: [Off Topic] Wed, BR05 talk - Digital Amateur TV talk
(Mark Atherton)
5. Wiring Pen Replacement (Richard Jones)
6. Re: Wiring Pen Replacement (Robin Gilks)
----------------------------------------------------------------------
Message: 1
Date: Sat, 3 Oct 2015 00:54:19 +1300
From: "Robin Gilks" <robin at gilks.org>
To: "Christchurch Robotics" <chchrobotics at lists.linuxnut.co.nz>
Subject: Re: [chbot] Most puzzling arm compilation problem [SOLVED]
Message-ID: <bd175743012779f21aeea36fb744a2cd.squirrel at gilks.ath.cx>
Content-Type: text/plain;charset=iso-8859-1
>
>> There are a lot of different libraries you can use with ARM.
>>
>> Newlib is supremely ugly IMHO if you use printf() it pulls in all sorts
>> of
>> stuff you really don't want for smaller bare metal apps.
>>
>> printf pulls in a whole streams layer + malloc + airconditioning and hot
>> and cold running water. You just want a banana, but you get the gorilla
>> it
>> comes with.
>>
>> If you get overlapping sections it means one of:
>> 1) The code has memory sections the linker script does not understand.
>> It
>> puts them at 0 and overlaps other memory (eg. flash).
>> 2) Trying to stuff in more code/data than you have space.
>>
>> Look at the map file and other outputs from the linker step that
>> normally
>> gives you hints.
>>
>> Another printf worth trying is
>> http://www.sparetimelabs.com/tinyprintf/tinyprintf.php
>>
>>
>
> After a lot of searching of the map file I eventually found that the
> section ".ARM.exidx" was not being allocated space! A patch to the loader
> script put it out of the way in flash.
>
> This is only used for unwinding stacks etc on exception processing in c++
> so I don't need it on my c only project:)
>
> You're right about the size of the printf family brought in from newlib
> which was a surprise - using the BeRTOS sprintf implentation my app was
> 26804 bytes but with the newlib version it was 43676 bytes once I had
> removed the overlap error.
>
> Methinks that I'll look harder for a smaller embedded libc for
> cortex-m3!!!
I'm using newlib-2.1 which includes newlib-nano so by using the spec file
to include it and some tips I found here
https://plus.google.com/+AndreyYurovsky/posts/XUr9VBPFDn7
the size of my sample application has come down from 24944 (some app level
optimisation from the figure above) to 13252. This is smaller than the AVR
although the BSS section is slightly larger with the ARM.
All I need now is some hardware!!
--
Robin Gilks
Internet: robin at gilks.org http://www.gilks.org
Tel: (+64) (3) 347 4370
------------------------------
Message: 2
Date: Sat, 3 Oct 2015 12:04:56 +1300
From: Mark Atherton <markaren1 at xtra.co.nz>
To: AlanNicky Page <alan.nicky.page at gmail.com>, Christchurch Robotics
<chchrobotics at lists.linuxnut.co.nz>
Subject: [chbot] [Off Topic] Wed, BR05 talk - Digital Amateur TV talk
Message-ID: <560F0D98.5040605 at xtra.co.nz>
Content-Type: text/plain; charset=utf-8; format=flowed
Hi All,
If any of you are interested, I will be giving a talk & demo of a
Digital TV system that started development in 2011.
Starts 7:30pm, at BR05 club rooms. See
http://www.idesignz.org/robotics/chch_robotics_br05.pdf
Regards, Mark
PS Molten Media have been of immense help with this non-profit, open
source project. I am in their debt for their support.
PPS Also would like to thank Broadcast Media Television Production & TV3
for donations of invaluable stuff
------------------------------
Message: 3
Date: Sat, 3 Oct 2015 12:31:43 +1300
From: Richard Jones <richard.jones.1952 at gmail.com>
To: Christchurch Robotics <chchrobotics at lists.linuxnut.co.nz>
Subject: Re: [chbot] [Off Topic] Wed, BR05 talk - Digital Amateur TV
talk
Message-ID:
<CAGQt8jyJMAgu212uMVZK5py67_X+5MB3tjYOGVzUoC3RF60KLQ at mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Did you have a particular day in mind?
Richard
On Sat, Oct 3, 2015 at 12:04 PM, Mark Atherton <markaren1 at xtra.co.nz> wrote:
> Hi All,
>
> If any of you are interested, I will be giving a talk & demo of a Digital
> TV system that started development in 2011.
>
> Starts 7:30pm, at BR05 club rooms. See
> http://www.idesignz.org/robotics/chch_robotics_br05.pdf
>
> Regards, Mark
>
> PS Molten Media have been of immense help with this non-profit, open
> source project. I am in their debt for their support.
>
> PPS Also would like to thank Broadcast Media Television Production & TV3
> for donations of invaluable stuff
>
>
>
> _______________________________________________
> Chchrobotics mailing list Chchrobotics at lists.linuxnut.co.nz
> http://lists.ourshack.com/mailman/listinfo/chchrobotics
> Mail Archives: http://lists.ourshack.com/pipermail/chchrobotics/
> Meetings usually 3rd Monday each month. See http://kiwibots.org for
> venue, directions and dates.
> When replying, please edit your Subject line to reflect new subjects.
>
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Message: 4
Date: Sat, 3 Oct 2015 12:39:42 +1300
From: Mark Atherton <markaren1 at xtra.co.nz>
To: Christchurch Robotics <chchrobotics at lists.linuxnut.co.nz>
Subject: Re: [chbot] [Off Topic] Wed, BR05 talk - Digital Amateur TV
talk
Message-ID: <560F15BE.7000501 at xtra.co.nz>
Content-Type: text/plain; charset="windows-1252"; Format="flowed"
Wed, 7 Oct 2015.
On 3/10/2015 12:31 p.m., Richard Jones wrote:
> Did you have a particular day in mind?
>
> Richard
>
> On Sat, Oct 3, 2015 at 12:04 PM, Mark Atherton <markaren1 at xtra.co.nz
> <mailto:markaren1 at xtra.co.nz>> wrote:
>
> Hi All,
>
> If any of you are interested, I will be giving a talk & demo of a
> Digital TV system that started development in 2011.
>
> Starts 7:30pm, at BR05 club rooms. See
> http://www.idesignz.org/robotics/chch_robotics_br05.pdf
>
> Regards, Mark
>
> PS Molten Media have been of immense help with this non-profit,
> open source project. I am in their debt for their support.
>
> PPS Also would like to thank Broadcast Media Television Production
> & TV3 for donations of invaluable stuff
>
>
>
> _______________________________________________
> Chchrobotics mailing list Chchrobotics at lists.linuxnut.co.nz
> <mailto:Chchrobotics at lists.linuxnut.co.nz>
> http://lists.ourshack.com/mailman/listinfo/chchrobotics
> Mail Archives: http://lists.ourshack.com/pipermail/chchrobotics/
> Meetings usually 3rd Monday each month. See http://kiwibots.org
> for venue, directions and dates.
> When replying, please edit your Subject line to reflect new subjects.
>
>
>
>
> _______________________________________________
> Chchrobotics mailing list Chchrobotics at lists.linuxnut.co.nz
> http://lists.ourshack.com/mailman/listinfo/chchrobotics
> Mail Archives: http://lists.ourshack.com/pipermail/chchrobotics/
> Meetings usually 3rd Monday each month. See http://kiwibots.org for venue, directions and dates.
> When replying, please edit your Subject line to reflect new subjects.
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Message: 5
Date: Sat, 3 Oct 2015 21:00:29 +1300
From: Richard Jones <richard.jones.1952 at gmail.com>
To: Christchurch Robotics <chchrobotics at lists.linuxnut.co.nz>
Subject: [chbot] Wiring Pen Replacement
Message-ID:
<CAGQt8jxJkP16oeJrMuaLoE=54au1QB9CbK1PpUN7Vn7bhk0_Ww at mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
I have mislaid my wiring pen, and I'm considering making a replacement
rather than buying a new one as the original Vero design did not feed that
well.
Something like this http://www.thingiverse.com/thing:27463
would probably not work well as it has no facility to tension or feed the
wire. This is what the Vero offering looks like:
http://www.verotl.com/en/product/verowire-wiring-pen-part-number-79-1732
Polite suggestions anyone? I do know I could make a PCB, but sometimes it
is just not worth the effort.
Thanks
Richard
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Message: 6
Date: Sat, 3 Oct 2015 22:43:50 +1300
From: "Robin Gilks" <robin at gilks.org>
To: "Christchurch Robotics" <chchrobotics at lists.linuxnut.co.nz>
Subject: Re: [chbot] Wiring Pen Replacement
Message-ID: <1faa28ef6e00edbc6302cfe97aa063e5.squirrel at gilks.ath.cx>
Content-Type: text/plain;charset=iso-8859-1
> I have mislaid my wiring pen, and I'm considering making a replacement
> rather than buying a new one as the original Vero design did not feed that
> well.
>
> Something like this http://www.thingiverse.com/thing:27463
> would probably not work well as it has no facility to tension or feed the
> wire. This is what the Vero offering looks like:
>
> http://www.verotl.com/en/product/verowire-wiring-pen-part-number-79-1732
>
> Polite suggestions anyone? I do know I could make a PCB, but sometimes it
> is just not worth the effort.
>
> Thanks
>
> Richard
If its going to a good home the 15 year old one I have here would benefit
from a new life!! Comes with 3 spools of wire and some 50-60 wire wiring
combs.
--
Robin Gilks
------------------------------
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