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1076 discussions

My little idea...
by Christopher Havel 17 Oct '13

17 Oct '13

Just a little something I cooked up ;) no pictures yet, but here's a wall of text about it... I've got hand drawn schematics made up for an EOMA-68... er... I'm calling it a Carrier Board for now (the PCB that the CPU card goes into). This one uses only through-hole components, and all but two (the PCMCIA slot and, oddly enough, the Ethernet jack) are very cheap. The idea is that someone like me who is rather a bit of a dunce with the soldering iron can still put it together in a dedicated weekend, if so inclined. *That is, a person with fairly beginner-level hobby skills can buy a fistful of parts and a CPU Card, etch a PCB (or get one from somewhere) and after a few hours of lead fume inhalation, has a complete computer in their hands.* That's a huge gift, I think, to the Maker community, not to mention the technically-inclined poor folk out there (I *know* I'm not the only one!)... seriously, it sounds like good stuff to me. My two rules for designing were (1) no surface mount anything at all period end-of-story, and (2) use as many very standard parts as possible. Every component can be had at Mouser Electronics in single unit quantities. The Ethernet jack has the magnetics built in, so it's (unfortunately) the most expensive part on the board -- but I couldn't find a through-hole Ethernet transformer... I've probably also omitted some necessary things out of simple ignorance (I have a hunch that there's more to the USB connection than four wires, a power supply and data feed, and the connector itself, for instance). I'm more budding hobbyist with this stuff than anything else -- but hey, you gotta start somewhere, right? ;) The only thing I don't like is that it still requires a custom PCB unless one wants to do some very creative dongle-making... probably doable but it'll be very ugly in a number of ways. That said, I'll be quite surprised if this design cannot get away with using a single-sided PCB -- meaning any shmuck who can get to eBay can order the supplies to make the board at home if they want to. (Sounds a little like me!) If anyone wants to try reading my horrible chicken scratch I'll send out a link to a scanned copy, otherwise I'll try and work up the motivation to move it into my graphics software (CorelDRAW X3), since, although I have a copy of Kicad, I never really bothered to learn how to use it properly... Any interest at all?

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Re: [Arm-netbook] 480 × 272 5" LCD lash up ready for testing
by luke.leighton 15 Oct '13

15 Oct '13

joe hi, how you getting on with that 480x272 LCD? give these a shot ok? [lcd0_para] lcd_used = 1 lcd_x = 480 lcd_y = 272 lcd_dclk_freq = 9 lcd_pwm_not_used = 1 lcd_pwm_ch = 0 lcd_pwm_freq = lcd_pwm_pol = 0 lcd_if = 0 lcd_hbp = 40 lcd_ht = 525 lcd_vbp = 8 lcd_vt = 576 lcd_hv_if = 0 lcd_hv_smode = 0 lcd_hv_s888_if = 0 lcd_hv_syuv_if = 0 lcd_hv_vspw = 5 lcd_hv_hspw = 30 lcd_lvds_ch = 0 lcd_lvds_mode = 0 lcd_lvds_bitwidth = 0 lcd_lvds_io_cross = 0 lcd_cpu_if = 0 lcd_frm = 1 lcd_io_cfg0 = 268435456 lcd_gamma_correction_en = 0 lcd_gamma_tbl_0 = 0x0 lcd_gamma_tbl_1 = 0x10101 lcd_gamma_tbl_255 = 0xffffff On Thu, Sep 12, 2013 at 12:01 PM, luke.leighton <luke.leighton(a)gmail.com> wrote: > joe this is amazingly already in here: > http://linux-sunxi.org/Fex_Guide#.5Blcd0_para.5D > > remember to run fex2bin script.fex script.bin after editing. > > ;RGB 480x272 module name: KD43G18-40NB-A11 > lcd_x = 480 > lcd_y = 272 > lcd_dclk_freq = 9 > lcd_if = 0 > lcd_hbp = 2 > lcd_ht = 525 > lcd_vbp = 2 > lcd_vt = 572 > > On Thu, Sep 12, 2013 at 11:09 AM, joem <joem(a)martindale-electric.co.uk> wrote: >> Hi, >> >> A 480 × 272 5" LCD which costs <$15 has been lashed up for testing: >> >> http://www.gplsquared.com/eoma_boot/eoma_boot.html#lcd_lashup >> >> The LCD is a KD43G18-40NB-A1. >> Aliexpress store sell these LCDs >> http://www.aliexpress.com/wholesale?SearchText=KD43G18-40NB-A1 >> >> Datasheet http://www.gplsquared.com/eoma_boot/KD43G18-40NB-A1-1.pdf >> >> Anyone got a time to do a time saving uSD image >> configured for 480 x 272 operation that I can try for >> a bit of quick verification :) ? >> >> >> _______________________________________________ >> arm-netbook mailing list arm-netbook(a)lists.phcomp.co.uk >> http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook >> Send large attachments to arm-netbook(a)files.phcomp.co.uk

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A point of confusion re: EOMA-68
by Christopher Havel 13 Oct '13

13 Oct '13

Hello all! I just wanted to try and understand something with EOMA-68 -- just a small question that's not explained well on the Wiki page. I had a design idea that I wanted to draw up (not much of the actual circuitry -- I'm not that good -- but enough so that some electronics engineers can "fill in the blanks", if you will, with the circuitry I can't figure out), but I've got to get this figured out first. So I can sort of figure out that external to the CPU Card, there needs to be an I2C EEPROM. What I can't quite figure out is the purpose of that EEPROM. I'm *guessing* that it's for IDing what the external interfaces are on the host board / carrier board (the PCB that the CPU Card plugs into) so that the CPU card can turn off what's not needed, and provide proper I/O protocols to what is needed -- but that's only a guess, because it's extremely unclear on the Wiki page. Would you folks be able to provide some clarification? Thanks! Christopher

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[flying squirrel] camera status report
by luke.leighton 13 Oct '13

13 Oct '13

http://rhombus-tech.net/community_ideas/kde_tablet/news/ ok so whilst adam greig was successful because he used a camera sensor that could be brought down to a 6mhz clock rate, the $3 part we've sourced won't go below 12mhz. so, we have to upgrade to an STM32F207VCT6, which has DCMI (camera sensor) support built-in, amazingly. so, this *almost* concludes the set of hardware testing for the flying squirrel. l.

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Re: [Arm-netbook] [flying squirrel] TODO list
by luke.leighton 12 Oct '13

12 Oct '13

right here's a few little files: http://rhombus-tech.net/community_ideas/kde_tablet/csivoltages.py http://rhombus-tech.net/community_ideas/kde_tablet/axp209.py http://rhombus-tech.net/community_ideas/kde_tablet/gpio_up.sh in case anyone ever needs to program the AXP209 from userspace, the axp209.py (GPLv2, taken from u-boot, thanks to henrik, cut/paste conversion from c to python) file is capable of setting the LDO2, LDO3 and LDO4 voltages. the gpio_up.sh is a little script which pulls the relevant GPIO pins for BOOT0 and RESET on the STM32F. l.

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3D acceleration working with Ubuntu 13.04 for EOMA68-A20 (and Cubieboard2)
by joem 10 Oct '13

10 Oct '13

3D acceleration working with Ubuntu 13.04 for EOMA68-A20 (and Cubieboard2): http://www.gplsquared.com/eoma_boot/eoma_boot.html#Ubunt_13_04_3D Functions more and more like a real PC now. Kicad also got installed and it is reasonably usable. So use that to design your next EOMA application PCBs :) Also installed were xfce4, lxde and openbox window managers. Gambas installed from sources. The sound works through jack socket (hdmi sound - nothing as yet although it is known to work through booting up Android), and espeak works. So you could send it commands through serial port for example software, let gambas serial port program read the text and then the machine can be made talk back by gambas calling espeak. : I used it for the embedded work - instead of reading reams of logs, it puts important data out as text embedded inside <s>..things to say...</s> brackets and I filter for that with a gambas program and get the most relevant points read back out. NICE!!! When you first log in, a 3D animation runs if its all working.

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Specifics of EOMA gpio
by joem 10 Oct '13

10 Oct '13

Hi Luke or anyone, Need to know specific commands to turn on/off EOMA gpio lines for some testing. Is there documentation somewhere? If not, create a web page, and let me know where and list of lines that can be controlled, and i check it and get it documented etc....

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flying squirrel weirdness on the I2C bus
by luke.leighton 09 Oct '13

09 Oct '13

ahh.... something really weird going on with the flying squirrel i2c addressing. i'm running i2cdetect and it's showing up 0x34 for the AXP209 I2C address instead of 0x68, and so on. i _thought_ i got the address for the I2C EEPROM right, from the datasheet (0xA2) - but it seems that it's been shifted by one bit (0x51) as well. help! i have no idea what's going on here! l.

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Possible GPU?
by Lauri Kasanen 09 Oct '13

09 Oct '13

Hi, I was wondering if you'd heard about Bruno's open GPU that's about to go kickstarter, and what you think of it. They want to open the IP from Number Nine, in FPGA form. It has both 2d and fixed-function GL parts, separable from each other if only 2d is needed. I don't know of the exact specs yet, and clearly making it an ASIC would be costly, but it's still an interesting proposition. - Lauri [1] http://en.wikipedia.org/wiki/Number_Nine_Visual_Technology [2] http://phoronix.com/forums/showthread.php?82356-Would-A-Kickstarter-Open-So…

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Another chip to consider for a future EOMA product
by Derek 09 Oct '13

09 Oct '13

http://www.theverge.com/2013/9/10/4715514/intel-quark-internet-of-things-we… Intel's new "Quark" (might be the X1000) chip, which runs an x86 architecture at 400 MHz, somewhere between .4 and 1.3 watts.

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