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by dpawson
Sat Dec 10, 2011 4:55 pm
Forum: General discussion
Topic: UART for using Raspi without a screen
Replies: 48
Views: 10517

Re: UART for using Raspi without a screen

<r>Take a look at <URL url="http://www.bitsbox.co.uk/connects.html">http://www.bitsbox.co.uk/connects.html</URL><br/> They have pins you could perhaps solder to the rpi board, then run wires<br/> to a 9 way 232 connector and solder there?<br/> 0.1 inch pitch. Few pence, but shipping could be a probl...
by dpawson
Fri Dec 09, 2011 5:49 am
Forum: General discussion
Topic: What else for sale?
Replies: 22
Views: 3635

Re: What else for sale?

<r>[quote]<B><s>[b]</s>Quote from tufty on December 8, 2011, 07:46<e>[/b]</e></B><br/> [quote]<B><s>[b]</s>Quote from dpawson on December 2, 2011, 12:19<e>[/b]</e></B><br/> [Odd one for the mix? Would it be possible to have two images<br/> on the SD? riscos and fedora would be my combo, pretty pleas...
by dpawson
Mon Dec 05, 2011 5:50 pm
Forum: Staffroom, classroom and projects
Topic: Bash - Programming
Replies: 30
Views: 8350

Re: Bash - Programming

<r><URL url="http://tldp.org/LDP/abs/html/">http://tldp.org/LDP/abs/html/</URL><br/> If it's not there it likely isn't a part of bash.<br/> The scripting language IMHO... when that creaks, glue in some Python/Ruby.<br/> You only need to be as accurate as the computer you're using dictates.<br/> <br/...
by dpawson
Mon Dec 05, 2011 4:09 pm
Forum: General discussion
Topic: New forum request
Replies: 11
Views: 2239

Re: New forum request

Could we have a forum for software please.
Not any specific variety, just software for the rpi,
since it is a prime aim?

Dave
by dpawson
Mon Dec 05, 2011 2:57 pm
Forum: General discussion
Topic: Buying cables in preparation....
Replies: 24
Views: 3198

Re: Buying cables in preparation....

<t>Quote from nullstring on December 5, 2011, 14:52<br/> It uses a standard "full size" HDMI connector.<br/> <br/> Honestly, I've had no issue with the cheap 2 for $2 HDMI cables<br/> <br/> Is that from the alpha connector please?<br/> Is it about 14mm wide?<br/> <br/> Not the price, just the size I...
by dpawson
Mon Dec 05, 2011 2:17 pm
Forum: General discussion
Topic: Buying cables in preparation....
Replies: 24
Views: 3198

Re: Buying cables in preparation....

<r>Back on the HDMI (to dvi in my case).<br/> <URL url="http://en.wikipedia.org/wiki/HDMI">http://en.wikipedia.org/wiki/HDMI</URL> shows a number of variants on<br/> the HDMI side.<br/> Micro<br/> Mini<br/> *guess* full sized?<br/> <br/> Refers to type C (mini) being defined in 1.3 of the spec.<br/>...
by dpawson
Sun Dec 04, 2011 1:37 pm
Forum: Other projects
Topic: Vector Floating Point unit Odd instruction?
Replies: 6
Views: 1308

Re: Vector Floating Point unit Odd instruction?

Perhaps I can just summarize and say they're used in the dark arts!

Thanks Chris.

Dave
by dpawson
Sun Dec 04, 2011 12:10 pm
Forum: Other projects
Topic: Vector Floating Point unit Odd instruction?
Replies: 6
Views: 1308

Re: Vector Floating Point unit Odd instruction?

Glad to know its useful. Some of the instruction set I find quite puzzling!

Dave
by dpawson
Sun Dec 04, 2011 12:08 pm
Forum: Staffroom, classroom and projects
Topic: Computer Science 101 (Free Course)
Replies: 4
Views: 1838

Re: Computer Science 101 (Free Course)

Due care though, largely through watching the videos, I used up 32Gb last month
If yours is restricted, be careful.
Dave
by dpawson
Sat Dec 03, 2011 5:53 pm
Forum: Other projects
Topic: Vector Floating Point unit Odd instruction?
Replies: 6
Views: 1308

Re: Vector Floating Point unit Odd instruction?

<t>@tufty. Thanks for that.<br/> So the manual is right, I doubted it. Just didn't seem logical.<br/> Rn 2 3<br/> Rm 4 5<br/> r0 = (15 - 8) + r3<br/> <br/> Difference of products I can understand. Just struck me as a crazy<br/> mid-instruction operation, lsWords - msWords? FTW?<br/> As for swapping ...
by dpawson
Sat Dec 03, 2011 2:33 pm
Forum: Other projects
Topic: Vector Floating Point unit Odd instruction?
Replies: 6
Views: 1308

Re: Vector Floating Point unit Odd instruction?

<t>Looking at the ARM manuals.<br/> <br/> smlsld. Dual 16-bit Signed Multiply, 64-bit<br/> Accumulation of difference of 32-bit products.</para><br/> <para>smlsld{cond} RdLo, RdHi, Rn, Rm in outline<br/> <br/> lower = Rn.bottomHalf * Rm.bottomHalf<br/> upper = Rn.topHalf * Rm.topHalf<br/> RdHi|RdLo ...
by dpawson
Sat Dec 03, 2011 2:25 pm
Forum: General discussion
Topic: So what are (where are?) the goals of rpi/the foundation?
Replies: 11
Views: 1546

Re: So what are (where are?) the goals of rpi/the foundation?

<t>About 'us'? I might expect to go to that page to learn about people.<br/> An organisation is inanimate, hence not one of 'us'?<br/> <br/> I'm simply pointing out that the site is lacking a clear statement of it's goals<br/> aims, objectives in a prominent place so that someone visiting the site<b...
by dpawson
Sat Dec 03, 2011 9:40 am
Forum: General discussion
Topic: So what are (where are?) the goals of rpi/the foundation?
Replies: 11
Views: 1546

Re: So what are (where are?) the goals of rpi/the foundation?

Which I (perhaps naively) expect to be out the people? Not the organisation, it's aims etc.
Dave
by dpawson
Sat Dec 03, 2011 8:08 am
Forum: General discussion
Topic: So what are (where are?) the goals of rpi/the foundation?
Replies: 11
Views: 1546

Re: So what are (where are?) the goals of rpi/the foundation?

@tufty was asking who cared about them, I just went looking for them.
raspberrypi.org .com (not .co.uk) and found nothing?
Is the foundation relying on word of mouth for everything?
Including its goals?

Even the third sector needs some marketing

Dave
by dpawson
Fri Dec 02, 2011 4:38 pm
Forum: General discussion
Topic: Documentation for UART/SPI/I2C/GPIO
Replies: 7
Views: 1802

Re: Documentation for UART/SPI/I2C/GPIO

Unless there are going to be chip changes, how can the IO spec/ interface change?
I guess they are all known by now and mfc's literature available?
Or am I missing something? prom config? Ads mapping?

Strange the chip data can't be pointed to on the mfc site?
by dpawson
Fri Dec 02, 2011 12:42 pm
Forum: General discussion
Topic: Vector Floating Point unit.
Replies: 3
Views: 953

Re: Vector Floating Point unit.

<r>Quote from asb on December 2, 2011, 08:20<br/> Dave: have you tried looking through the ARM1176 TRM? <URL url="http://infocenter.arm.com/help.....index.html">http://infocenter.arm.com/help.....index.html</URL><br/> <br/> Yes.... But for cpu instructions I get couple of lines<br/> of explanation?<...
by dpawson
Fri Dec 02, 2011 12:19 pm
Forum: General discussion
Topic: What else for sale?
Replies: 22
Views: 3635

Re: What else for sale?

<r>[quote]<B><s>[b]</s>Quote from abishur on December 1, 2011, 19:13<e>[/b]</e></B><br/> <br/> We do know that there will be an offer of SD cards (with the appropriate image put on them) [/quote]<br/> <br/> Odd one for the mix? Would it be possible to have two images<br/> on the SD? riscos and fedor...
by dpawson
Fri Dec 02, 2011 12:12 pm
Forum: General discussion
Topic: Vector Floating Point unit.
Replies: 3
Views: 953

Re: Vector Floating Point unit.

@asb That's the one. Thanks.

Dave
by dpawson
Fri Dec 02, 2011 8:09 am
Forum: General discussion
Topic: Vector Floating Point unit.
Replies: 3
Views: 953

Re: Vector Floating Point unit.

<t>"ARM 1176 VFP floating point unit, VFPv2 is an extension to the<br/> ARM instruction set."<br/> <br/> So we have the vfpv2 extension set?<br/> <br/> So which instructions in the ARM manuals am I looking for please?<br/> Arm Arm reference mentions FPv4... but no v2?<br/> <br/> In the assembler man...
by dpawson
Thu Dec 01, 2011 3:11 pm
Forum: Off topic discussion
Topic: 30 years BBC Model B
Replies: 6
Views: 1232

Re: 30 years BBC Model B

<t>From which<br/> <br/> "The impact it has had 30 years on is amazing.<br/> <br/> Just look around places like Cambridge's Science Park to see the results. Many of these companies were founded by people whose thorough introduction to technology came through the BBC Micro.<br/> <br/> I hope machines...
by dpawson
Thu Dec 01, 2011 2:51 pm
Forum: Other projects
Topic: Need a willing volunteer...
Replies: 7
Views: 1657

Re: Need a willing volunteer...

Way OT Simon,
Details on your 232 hardware please with PIO wiring? I too will pick up on the little green frog
on a usb-232 connection, eventually.
No hw .... as yet.
Sorry can't help here.

Dave
by dpawson
Thu Dec 01, 2011 2:48 pm
Forum: Other projects
Topic: Suspend to SD-card - Power On/Off Handling
Replies: 21
Views: 4507

Re: Suspend to SD-card - Power On/Off Handling

<t>Recognising power down could use a simple capacitor based circuit surely?<br/> A drop in input power (away from the battery cct) produces a sharp spike which could trigger an action, recognised via the parallel lines as a signal, provides an interrupt (bloody high priority I'd hope),<br/> then wh...
by dpawson
Wed Nov 30, 2011 11:52 am
Forum: Other projects
Topic: ldr (immediate)
Replies: 13
Views: 2939

Re: ldr (immediate)

<r>thanks, that's the one.<br/> Found a list of arm directives<br/> <br/> <URL url="http://sourceware.org/binutils.....ndent.html">http://sourceware.org/binutils.....ndent.html</URL><br/> which seems incorrect in other places though.<br/> Odd.<br/> <br/> Anyway, I can now isolate data a long way fro...
by dpawson
Wed Nov 30, 2011 6:39 am
Forum: Other projects
Topic: ldr (immediate)
Replies: 13
Views: 2939

Re: ldr (immediate)

<t>I think we must have different assembler versions Simon?<br/> <br/> Assembler messages:<br/> second.asm:4: Error: invalid literal constant: pool needs to be closer<br/> <br/> where line 4 is<br/> ldr r0, =.Ldistant_target<br/> <br/> code as below<br/> <br/> regards<br/> <br/> > Try it this way ar...

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