wzab <wzab01@gmail.com> wrote:> >> What's the form factor? Does it have 0.1" headers so you could add >> processor horsepower to a veroboard / stripboard? That would be great >> for quick one-off tinker stuff. >> >Exactly. What I'm looking for is the Embedded Linux Computer with FPGA >connected directly to the CPUs bus and to 0,1" headers, so that my >students could deal with different peripherals (implemented in the >FPGA)Don't count on connecting a CPU bus. Those days are long gone. The speeds are too high. DDR and flash memory usually have dedicated busses. Even if you could craft something that resembles a memory bus there are many issues to work out. Especially if you would make the bus go over headers. Nowadays you'd use GPIO, I2C, SPI or USB. -- Failure does not prove something is impossible, failure simply indicates you are not using the right tools... nico@nctdevpuntnl (punt=.) --------------------------------------------------------------
OLinuXino, a serious Rasberry Pi competitor?
Started by ●March 7, 2012
Reply by ●March 9, 20122012-03-09
Reply by ●March 9, 20122012-03-09
In comp.arch.embedded Nico Coesel <nico@puntnl.niks> wrote:> Arlet Ottens <usenet+5@c-scape.nl> wrote: >>The USB 2.0 spec only allows for 500 mA maximum current after the device >>has been configured. Unconfigured devices are only allowed 100 mA. For > Sorry, but that is pure theory. In reality 99% of the PCs will happily > deliver >1A through their USB port.The only computers I've seen complaining about USB current consumption is Macs, both desktops and laptops, and running both OS X and Windows. You get this nice loop where the OS turns off the host port, pops up a warning dialog, automatically turns the host port back on, turns it back off again, pops up another dialog etc. I was still dismissing dialogs for almost a minute after yanking out the device. -a
Reply by ●March 9, 20122012-03-09
In comp.arch.embedded Paul <paul@pcserviceselectronics.co.uk> wrote:> In article <4f59a5a8$0$6882$e4fe514c@news2.news.xs4all.nl>, usenet+5@c- > scape.nl says... >> If the classroom already has computers, you don't need to get the >> Raspberry Pi at all. Just let the kids use the regular computers. > Yes you do as IT services will not allow loading of packet sniffers > practicals with network addressing, subnets and a myriad of other things > done to those systems.The Model A that is intended for classrooms does not have on-board Ethernet. -a
Reply by ●March 9, 20122012-03-09
Jan Panteltje <pNaonStpealmtje@yahoo.com> wrote:>On a sunny day (Thu, 8 Mar 2012 21:54:33 -0000) it happened Paul ><paul@pcserviceselectronics.co.uk> wrote in ><MPG.29c33af090e5be4c989707@172.16.0.1>: > >>Firstly it is suggested by them to use an MP3/camera/phone USB to microB >>cable in the user guide. >> >>Secondly the base price does not include a wall wart. I don't think it >>even includes a USB cable either. >> >>Thirdly because that is what people WILL be doing >> >>A classromm with computers already why get out wall warts (which at >>least one kid will trouser as he could do with one or thjinks it will be >>cool). >> >>A classroom with other computers already there teacher does not have >>to hand out an extra thing. >> >>People at home forget to get a wall wart or take board to show someone >>else or nerdy kid takes with him to 'play' with elsewhere and forgets >>wall wart. >> >>Someone travelling between countries and different shaped holes in walls >>so wall wart does not work. > >On top of that it needs 5V *stabilized*. >That is a big problem, it should have been 7 to 20 V unstabilized,Is this a hard spec or do they just say that to make it simple. I see a 3.3V regulator close to RP's power connector. -- Failure does not prove something is impossible, failure simply indicates you are not using the right tools... nico@nctdevpuntnl (punt=.) --------------------------------------------------------------
Reply by ●March 9, 20122012-03-09
In article <jjdt7n$373$1@speranza.aioe.org>, Anders.Montonen@kapsi.spam.stop.fi.invalid says...> > In comp.arch.embedded Paul <paul@pcserviceselectronics.co.uk> wrote: > > In article <4f59a5a8$0$6882$e4fe514c@news2.news.xs4all.nl>, usenet+5@c- > > scape.nl says... > >> If the classroom already has computers, you don't need to get the > >> Raspberry Pi at all. Just let the kids use the regular computers. > > Yes you do as IT services will not allow loading of packet sniffers > > practicals with network addressing, subnets and a myriad of other things > > done to those systems. > > The Model A that is intended for classrooms does not have on-board Ethernet. > > -aWhat is intended and what will be bought for various curricula is different, as I have dealings with ICT/Computing teachers in UK most are actually interested in Model B not A, hard wired LAN is easier as lots of building have no wifi or wifi blackspots. Anyway adding wifi may seem cheap until you lose opne or two a lesson and more bits to check in and out. -- Paul Carpenter | paul@pcserviceselectronics.co.uk <http://www.pcserviceselectronics.co.uk/> PC Services <http://www.pcserviceselectronics.co.uk/fonts/> Timing Diagram Font <http://www.gnuh8.org.uk/> GNU H8 - compiler & Renesas H8/H8S/H8 Tiny <http://www.badweb.org.uk/> For those web sites you hate
Reply by ●March 9, 20122012-03-09
In article <jjdsuf$2ch$1@speranza.aioe.org>, Anders.Montonen@kapsi.spam.stop.fi.invalid says...> > In comp.arch.embedded Nico Coesel <nico@puntnl.niks> wrote: > > Arlet Ottens <usenet+5@c-scape.nl> wrote: > >>The USB 2.0 spec only allows for 500 mA maximum current after the device > >>has been configured. Unconfigured devices are only allowed 100 mA. For > > Sorry, but that is pure theory. In reality 99% of the PCs will happily > > deliver >1A through their USB port. > > The only computers I've seen complaining about USB current consumption is > Macs, both desktops and laptops, and running both OS X and Windows. You get > this nice loop where the OS turns off the host port, pops up a warning > dialog, automatically turns the host port back on, turns it back off again, > pops up another dialog etc. I was still dismissing dialogs for almost a > minute after yanking out the device. > > -aIn last two years seen at least three Win PCs complain about it. -- Paul Carpenter | paul@pcserviceselectronics.co.uk <http://www.pcserviceselectronics.co.uk/> PC Services <http://www.pcserviceselectronics.co.uk/fonts/> Timing Diagram Font <http://www.gnuh8.org.uk/> GNU H8 - compiler & Renesas H8/H8S/H8 Tiny <http://www.badweb.org.uk/> For those web sites you hate
Reply by ●March 9, 20122012-03-09
On Mar 9, 9:22=A0pm, n...@puntnl.niks (Nico Coesel) wrote:> wzab <wza...@gmail.com> wrote: > > >> What's the form factor? Does it have 0.1" headers so you could add > >> processor horsepower to a veroboard / stripboard? That would be great > >> for quick one-off tinker stuff. > > >Exactly. What I'm looking for is the Embedded Linux Computer with FPGA > >connected directly to the CPUs bus and to 0,1" headers, so that my > >students could deal with different peripherals (implemented in the > >FPGA) > > Don't count on connecting a CPU bus. Those days are long gone. The > speeds are too high. DDR and flash memory usually have dedicated > busses. Even if you could craft something that resembles a memory bus > there are many issues to work out. Especially if you would make the > bus go over headers. Nowadays you'd use GPIO, I2C, SPI or USB. >Why do you think so? E.g. in a board based on AT91SAM9G45 ( http://www.atmel.com/Images/doc6438.pdf ) you can easily connect DDR RAM to dedicated pins (DDR_A* DDR_D* etc.) and use separate EBI pins to connect FPGA. We have created such prototype a few years ago ( http://www.ise.pw.edu.pl/~wzab/artykuly/fpga_edu.pdf ), but now it could be done much cheaper, and provide much better parameters. The idea is to have a single hardware configuration, which may be configured to have an PC working with simple bus connected peripheral or with complex Bus Mastering DMA capable peripheral, or a peripheral connected via ISI, I2S, SPI or whatever else. -- Regards, Wojtek
Reply by ●March 9, 20122012-03-09
Preliminary schematic of the iMX233-OLinuXino has been uploaded to GitHub. This is very rough and will have lot of changes. These changes will possibly be uploaded on Monday. https://github.com/TsvetanUsunov/OLINUXINO/blob/master/HARDWARE/iMX233-OLinuXino-Rev-A.pdf A new user group has been set up for this board at: http://tech.groups.yahoo.com/group/olinuxino/ This is one of two new Linux low cost boards, that will be produced by Olimex. First one has 64Mb of ram, second one will be the same CPU speed as RPi, and have 256Mb of ram. ====================== Question: Like the idea, some sort of raspberry pi. What kind of android version would be supported since it only contains 64mb ram ? incl. TV out ? Answer: OLIMEX Ltd says: March 7, 2012 at 10:05 pm sorry there are few projects in my mind ;) indeed 64MB memory is too low for Android, but there is another project with 256MB and different processor which is too early to announce now :) ====================== Cheers Don... =================== -- Don McKenzie Dontronics: http://www.dontronics-shop.com/ DuinoMite the PIC32 $35 Basic Computer-MicroController http://www.dontronics-shop.com/the-maximite-computer.html Just add a VGA monitor or TV, and PS2 Keyboard. Arduino Shield, Programmed in Basic, or C.
Reply by ●March 9, 20122012-03-09
On 2012-03-09, Nico Coesel <nico@puntnl.niks> wrote:>>On top of that it needs 5V *stabilized*. >>That is a big problem, it should have been 7 to 20 V unstabilized, > > Is this a hard spec or do they just say that to make it simple. I see > a 3.3V regulator close to RP's power connector.the core runs off that regulator, the USB socket and the expansion connectors have the input power directly connected. The ethernet and the onboard USB hub may need 5V. -- ⚂⚃ 100% natural --- Posted via news://freenews.netfront.net/ - Complaints to news@netfront.net ---
Reply by ●March 9, 20122012-03-09
Anders.Montonen@kapsi.spam.stop.fi.invalid wrote:>In comp.arch.embedded Paul <paul@pcserviceselectronics.co.uk> wrote: >> In article <4f59a5a8$0$6882$e4fe514c@news2.news.xs4all.nl>, usenet+5@c- >> scape.nl says... >>> If the classroom already has computers, you don't need to get the >>> Raspberry Pi at all. Just let the kids use the regular computers. >> Yes you do as IT services will not allow loading of packet sniffers >> practicals with network addressing, subnets and a myriad of other things >> done to those systems. > >The Model A that is intended for classrooms does not have on-board Ethernet.No problem. A USB to ethernet converter works just as well. There is a big chance the onboard ethernet works through USB. Many SoCs don't provide a MAC because mobile devices don't need one. -- Failure does not prove something is impossible, failure simply indicates you are not using the right tools... nico@nctdevpuntnl (punt=.) --------------------------------------------------------------
