arm-netbook October 2013

arm-netbook@lists.phcomp.co.uk

23 participants
37 discussions

stress! and working with libopencm3, stm32sprog and an STM32F103
by luke.leighton 21 Oct '13

21 Oct '13

well. there is a particular issue with stm32sprog which has massively hindered progress over the past few weeks. it's very simple: when uploading and running a program using stm32sprog, if it has interrupt service routines it is guaranteed to crash. however if you then set BOOT0 to 0 and do a RESET, the program will work absolutely fine [assuming it's coded correctly] this simple little thing has prevented progress over the past couple of weeks because it has been impossible to distinguish "code incorrectly written" from "code that crashed due to stm32sprog". dozens of examples and bits of code that _should_ have worked - DMA, ADC, DAC, Timers - will and can now all be revisited. patience, patience... ... anyway i'm currently tracking how to get timers to update from an external gpio pin, and from there to fire DMA. it _is_ possible... just.... requires a huge amount of careful reading and research just to come up with only 30 lines of code that connect all the dots together without connecting any of the thousands of other options. i think... to be absolutely honest, if i had known that the STM32F was so comprehensive / complex i would have said "sod it" and used a low-cost FPGA instead. but, hey, this is kinda hair-raisingly fun.... l.

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Allwinner A10 vs A20 power requirements
by Alexey Eromenko 20 Oct '13

20 Oct '13

Hi, I was unable to find the power requirements for A10 and A20 chips. (under near idle use and max. Performance scenarios) Do you know where that data is buried? (A20-based Cubietruck, according to documentation, can work with 0.5 amp x 5 volt = 2.5W total for the board, without SATA. ) What about Raspberry Pi's Broadcom chip? What it's power requirements? Alexey

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Re: [Arm-netbook] My little idea...
by Hans-Christian Jehg 18 Oct '13

18 Oct '13

On Wed, 16 Oct 2013 14:12:24 -0400, Christopher Havel wrote: > Here, have a scan, guys! -->http://i.imgur.com/f2lbm3R.jpg > > There's the VGA interface. Any tweaks you want to add, add. WOW > To enable 18b VGA you need one GPIO. > Adding 24b capability requires a second GPIO. The circuit as drawn uses > GPIO3 and GPIO4 to not conflict with the earlier schematics which use > GPIOs 0,1,2 to drive the Ethernet port LEDs. How about putting those VGA GPIO on an I2C extender to keep GPIO free for something that needs GPIO? - Just a thought :-) HC

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A20 Hummingbird Development System
by krasi gichev 18 Oct '13

18 Oct '13

Anyone checked this one? I got notification from wits-tech about it.

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MEBv1 - All dressed up and no EMOA to go.
by Scott Sullivan 18 Oct '13

18 Oct '13

EMOA MEB's, Now in Colour! http://revident.net/projects/emoa-68/meb-v1-w-cases-in-colour.jpg So, the last to arrive due to a shipping malfunction, my MEBs arrived today. This evening I spent some time with the Laser Cutter at Hacklab.to to cut out Joem's cases design. I didn't get in on the initial batch of cards due to constraints in time, budget and skills. Now that the peripherals are confirmed I'm looking forward to standing on the shoulder of giants. Great projects lay ahead. -- Scott Sullivan

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Re: [Arm-netbook] EOMA68-A20 + SATA dock becomes accidental PC that boots in 20 seconds
by Arokux X 18 Oct '13

18 Oct '13

Hello Christopher, what is the state of the MEBv2? Luke just told sunxi.org this is the only critical piece that holds 2.5k A20-EOMA from seeing the world :) Best, Arokux

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Chinese PC for $90 - CubieTruck
by Alexey Eromenko 17 Oct '13

17 Oct '13

http://store.r0ck.me/blogs/news/9361679-cubietruck-is-ready-to-order-now And Cubietruck.com based on AllWinner A20 CPU + 2 GB RAM ! Should be good ! (I hope it will run Debian-ARM with KDE and Android just fine) Have ordered one to see how it goes. Previous efforts were either too weak (VIA APC) or lacked I/O ports. (Cubieboard, Riko MK802, ...) or both (Raspberry pi). I believe It's the first system that's good. First sub- $100 PC ! What do you think of it? -- -Alexey Eromenko "Technologov"

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NAND flash memory purchasing
by Hrvoje Lasic 17 Oct '13

17 Oct '13

Does anybody in this list have experience buying NAND flash memory in China. If so what is the best way to see which memory is easily accesible (and therefore cheap)? <lasich(a)gmail.com>

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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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arm-netbook October 2013