I can imagine, say, a USB driven display being unable to be refreshed (i.e. repainted) faster then 15Hz but i cannot imagine a display refresh rate below about 24 Hz (as you say Afarre, it would flicker badly)
I can imagine, say, a USB driven display being unable to be refreshed (i.e. repainted) faster then 15Hz but i cannot imagine a display refresh rate below about 24 Hz (as you say Afarre, it would flicker badly)
... there will be no flicker becouse the dysplay only changes the pixels when it receves the new pixel assinments. lcds are differnt from crts. if a crt was operating at 15hz, then suyre it would be flikering horrably, but lcds do not flicker.
cheaper alternate screens ive been looking at have had rgb inputs, but needed 15 hz sync
I've never seen anything spec'ed for 15Hz. Do you mean the horizontal freq (15KHz) or the vertical frequency (60Hz) for standard NTSC video?
Standard VGA on the other hand is typically 60Hz vertical and 31.5KHz horiz but can go up to 70-75 Hz vert and 45KHz horiz.
... there will be no flicker becouse the dysplay only changes the pixels when it receves the new pixel assinments. lcds are differnt from crts. if a crt was operating at 15hz, then suyre it would be flikering horrably, but lcds do not flicker.
chris
Depends on the interface, but yes, you can get LCDs to flicker with the wrong signals. Been there.
I think he's actually talking about 15 KILO Hz for the horizontal freq. In all the years I've been playing with this type of stuff, I've never seen a 15Hz refresh - but that's not to say there might not be one.
Depends on the interface, but yes, you can get LCDs to flicker with the wrong signals. Been there.
I think he's actually talking about 15 KILO Hz for the horizontal freq. In all the years I've been playing with this type of stuff, I've never seen a 15Hz refresh - but that's not to say there might not be one.
correct khz
15 is the same as any old tv
the screens work as is, its just, the display is repeated 3 times across the screen
first off, aferre, great work, i've been following the aximizer and the search for the USB host for a while now, i've just not spoken up till now..
hopefully someone gets a X51v (or even X50 basic) mobo to tear apart and figure out whats going on with the PXA270 USB host pin leads... however, i think that you were right in your close-up picture board that the segemented four pin arrangements are the two usb hosts... just a hunch. what else could they be?
regardless, you can always try it by powering the axim while it's dismantled (maybe even use the external display via the Raotec USB host to your lcd/touch screen for control)... and test the pinouts on the sets of four connectors with a multimeter... even if only for voltage. you should see a 5v line in there somewhere, and the rest should be self-explanitory. at least if you find the 5v + and - leads, it'll give you a starting point, maybe even to prompt wiring them to a dummy terminal, and desoldering/resoldering and testing a basic usb device (like a pen drive) till it detects.
first off, aferre, great work, i've been following the aximizer and the search for the USB host for a while now, i've just not spoken up till now..
hopefully someone gets a X51v (or even X50 basic) mobo to tear apart and figure out whats going on with the PXA270 USB host pin leads... however, i think that you were right in your close-up picture board that the segemented four pin arrangements are the two usb hosts... just a hunch. what else could they be?
regardless, you can always try it by powering the axim while it's dismantled (maybe even use the external display via the Raotec USB host to your lcd/touch screen for control)... and test the pinouts on the sets of four connectors with a multimeter... even if only for voltage. you should see a 5v line in there somewhere, and the rest should be self-explanitory. at least if you find the 5v + and - leads, it'll give you a starting point, maybe even to prompt wiring them to a dummy terminal, and desoldering/resoldering and testing a basic usb device (like a pen drive) till it detects.
who knows? might get lucky.
It is a good idea, but to do that we must previously work on software hack.
I knew software hack would be the second battle and it could be also a hard nut to crack.
If hardware hack is not too much dependable, we can get lost with software.
But I still like the idea, what I do not like too much is opening my Axim once again
What we can do is start to work with the software, if we get something dependable previous Bigbob succeed with the broken motherboard: I will do the tests.
This could be a good starting point:
Are required software and Reg Keys present?
Bigbob said that they probably were at previous ROM versions. We could make some comparison between ROM versions.
We could also take a look at others PDAs using PXA270 & WM5 and providing USB HOST: Pocket Loox C550, Pocket Loox N560 (any one else?)
Probably using PXA270 is not a condition, so we can also consider:
Acer N310, N311 (any one else?)
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In addition to that, we do not know if that "supposed" USB port is full implemented and ready to use, or it just came from CPU and needs to be completed with circuit driver driver post at first link
couldn't we, in theory, simply swap the driver out, modify the registry, then soft reset?
even if the driver ended up in a user-accessable part of the memory... though, i don't see why you shouldn't be able to put it somewhere "hidden" (as there are other drivers that can be added to the OS.)
as we know the driver was fully functional prior, either all we need to do is find someone with the old ROM, isolate the driver, and exctract it, or find the ROM file, and perform the same process, though, with the latter we'd run into the problem of decoding the ROM to access the files (will WinRAR do this?).
soo... does anyone know someone with an old ROM to help out?
I don't believe the Axim ever had the master side of the USB drivers, which would allow connecting USB devices to the Axim,
just modifying the registry without the actual driver would not help.
If someone out there has a usb driver for a ppc that would probably be the best starting point, but you'd have to have the source and be ab;e to modify it for this device.
As for the HW, I doubt there is everything you need inside the Axim. I would be if the connections being discussed trace back to the uP then you'd still need the rest of the internal usb HW, probably something that could be stuck inside the aximizer, if you could add some lines to the outside of the Axim.
I'm not sure if you totally understand the aspects we're discussing here... i mean, we've already extablished that there is a USB Host INSIDE of the PXA270 chip. so really, no new chipsets are needed... just a client on the usb line (probably a HUB) and drivers to make the whole thing work... we're not adding a new device to the internal bus, we're just trying to enable something that's already there.
additionally, i found that the Acer n310 PDA is a WM5 based unit with USB-host function built-in. i found the ROM for it, but i'm having problems decifering the files from the ROM, anyone know any tools that might be useful for this?
also, i discovered that i had an old copy of the A04 update that someone was mentioning something about, (modifications in the A05 update that made something like this less-possible) and again, problems extracting files.
if anyone has any ideas that might help get the driver files from the BIN/IMG/DIO files, let me know, i'll give it a try.
I'm not sure if you totally understand the aspects we're discussing here... i mean, we've already extablished that there is a USB Host INSIDE of the PXA270 chip. so really, no new chipsets are needed... just a client on the usb line (probably a HUB) and drivers to make the whole thing work... we're not adding a new device to the internal bus, we're just trying to enable something that's already there.
You cannot directly use CPU lines. You need to use the circuit driver you can find at first post. It is an small circuit and, as uzziah0 said, it could probably be fitted externally. In that case you would have a USB HOST partially implemented, like serial port.
Other thing would be if USB host circuit driver was alredy inside Axim. But it is near the miracle
I don't believe the Axim ever had the master side of the USB drivers, which would allow connecting USB devices to the Axim,
just modifying the registry without the actual driver would not help.
If someone out there has a usb driver for a ppc that would probably be the best starting point, but you'd have to have the source and be ab;e to modify it for this device.
I do not believe we need driver sources, if it was true we better abandon because we will never get it
Getting the propper set of files and registry keys should be enough.
I asked Mikespikel, one of the people who did BT Stack hack, and he agrees.
Our sofware hack should be still easier than BT Stack because it does not involve third party files.
...additionally, i found that the Acer n310 PDA is a WM5 based unit with USB-host function built-in. i found the ROM for it, but i'm having problems decifering the files from the ROM, anyone know any tools that might be useful for this?
also, i discovered that i had an old copy of the A04 update that someone was mentioning something about, (modifications in the A05 update that made something like this less-possible) and again, problems extracting files.
if anyone has any ideas that might help get the driver files from the BIN/IMG/DIO files, let me know, i'll give it a try.
I do dot know how to extract files from a Dell ROM image.
Maybe people who work at BT stack can give us some inputs.
A better way would be taking every thing from an C550, N560 or N50 PDAs. Remember we not only need files but also registy keys.
A device running Windows CE.NET 5 would be also valid.
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