![]() ![]() I do not recommend following them to the letter.Īt some point, I will create a schematic that you can implement yourself.Įven with the LCD off, there is still power to the AX206 from the battery.īe careful to not touch any other pins besides the ones mentioned here. Warning, these rework steps are historical and incomplete. A replacement PCB and simple instructions that allows advanced features like adding uSD card, but requires a heat gun for LCD removal.An add-on PCB and clear instructions that would allow easy connections to the existing PCB.WARNING: BE CERTAIN THAT POWER IS APPLIED TO DEVICE FROM USB OR BATTERY IF USING PROP-PLUG.įailure to have power applied via USB or battery with Prop-Plug attached may cause damage to your Prop-Plug.Ĭonsidering the complexity of the task, I expect to offer two PCB solutions to make this hardware hack work: So far, my $11 gamble has turned out pretty good. My backup plan (in case I destroy the QFP) is to use mctrivia's PropMod 1x1, but even that is too big. Tomorrow I plan to disconnect the AX206 from the LCD and install a Propeller QFP, EEPROM, crystal, and Prop-Plug header. So 13 + 3 = 16 generic Propeller pins allocated so far (and 4 pins for Serial communications and EEPROM access), and we still have 12 pins left for fun. The other buttons can be used for game-play or whatever. I think I'll intercept the center config button function and let Propeller send the power-up/down sequence and other AX206 software interface sequences. Looks like plenty of wiggle-room for adding Propeller hooks to the buttons. The current plan is to detach the LCD interface from the 8051, keep the 8051 in-circuit for power management and USB, and connect the Propeller to the LCD using 13 pins total (there is a SDIO mode, but the parallel interface looks good to me:). So it looks entirely possible to have live real-time video. The write cycle time minimum is 200ns and the read cycle time (yeah read-modify-write!) is 400ns. It looks like the LCD might be fully update-able at about 100 times/second by the Propeller. So, what is the plan? That's defined by the resources at hand. This got me thinking that I should really leave the USB device in tact so I can download BMPs for Propeller game sprites :) We'll see if I can hook the Propeller to it. The SX has a different CPU and flash and looks really good for PC-USB driven photo-frame hacking. Well that's a large serial flash device :)ĭuring my browsing for all the specs I came accross an article for hacking the COBY DP151-SX. Looking around on the other side of the PCB and starting to really appreciate this package with the USB port and 4V rechargable battery, I noticed an 8 pin SOIC that is marked 25L080. I could not find a detailed spec on that exact PN, but did find a spec for the AX203 in a zip package that amazingly contained another LCD spec that would be compatible with the varitronix LCD. ![]() With two important specs in hand, I decided to look up the chip which is an AppoTech AX206 which appears to be a really nice mask-rom 8051 controller with a USB2.0 interface and lots of GPIO. There I found the controller is an ST7687S and I was able to find a specsheet for that too. It turns out that the LCD is a CTSN technology and the specsheet is available by email. ![]() I Googled the various part-numbers on the LCD and found the most promising link at. I slowly detached the LCD panel from the gluey foam and found a cute chip connected to the LCD pins. I was immediately delighted by the look of the LCD packaging and the fact that a part-numb er was printed on the side. Taking the device apart was fairly easy by removing 2 screws and nudging apart the tiny clam-shell. It comes equipped with an LCD, a USB port and software in the flash, 3 user buttons, a rechargable ~4V 180mah lipo battery, a very nice little case, and a keychain. What is a DP151? It is a 1.44" diagonal photo-frame on a key-chain. After being thouroughly accosted at the door by the receipt checker, I made it home with my new toy. Well, at that price I couldn't resist the "hack it up" urge. I was wandering through the local Fry's and found the COBY-DP151 Digital Photo Keychain for $11. ![]()
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