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Calculator Modifications =>
Calculator Hardware, Electronics, Robotics
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AlienCC
Creative Receptacle!
Know-It-All
Joined: 24 May 2003
Posts: 1927
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 Posted: 26 Feb 2005 04:30:55 am Post subject: |
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With the recent release of TI Calculators with a USB Port on them, is it possible that we could get USB Flash Jump Drives to work as Expandable memory? Has anyone even thought of this yet, and if so what are the road blocks from making it a reality?
--AlienCC |
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shadowing
Powered by 64
Calc Guru
Joined: 06 Jan 2004
Posts: 1002
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| Posted: 26 Feb 2005 09:50:01 am Post subject: |
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I think there is a possible way. But then we would need to create drivers for the calculator in order to actually write to the flash. That may be the roadblock.  |
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DarkerLine
ceci n'est pas une |
Super Elite (Last Title)
Joined: 04 Nov 2003
Posts: 8328
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| Posted: 26 Feb 2005 10:38:23 am Post subject: |
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| The USB on a calculator isn't exactly compatible with most regular USB. |
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Cap'n Refsmmat
Newbie
Joined: 18 Nov 2004
Posts: 41
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| Posted: 26 Feb 2005 08:31:16 pm Post subject: |
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| I think you'd need to use some sort of adapter; I don't know it that adapter already exists or if it would need to be custom-made. |
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shadowing
Powered by 64
Calc Guru
Joined: 06 Jan 2004
Posts: 1002
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| Posted: 26 Feb 2005 11:25:54 pm Post subject: |
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| Heh, I'd think It would need a driver with some sort of modification either done to the USB flash, or the USB port. |
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DigiTan
Unregistered HyperCam 2
Super Elite (Last Title)
Joined: 10 Nov 2003
Posts: 4468
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| Posted: 27 Feb 2005 01:07:35 am Post subject: |
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I was about to say it'd be a longshot but it turns out there are many PIC controllers that support full-speed USB 1.1 and 2.0. All of them sell for under $10, so if someone could get their hands on one, I guess using a mem stick would be a matter of writing a program to do all the FAT32 work and handshaking. I'm guessing the calc already has routines for handshaking since the cable works, so the hard part should be the FAT32 stuff.
Also, if you can use ASM to get full control of the USB port, you might be able to do it without an external equipment--assuming the calc can use full-speed mode. I couldn't find much hard data on these flash sticks but CompuPhase covers some of them in one of their articles. Awesome idea! If someone could pull it off, it might be the best calc mod of all time! |
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elfprince13
Retired
Super Elite (Last Title)
Joined: 11 Apr 2005
Posts: 3500
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| Posted: 27 Apr 2005 09:00:36 am Post subject: |
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[quote name='Cap'n Refsmmat' date='Feb 26 2005, 08:31 PM']I think you'd need to use some sort of adapter; I don't know it that adapter already exists or if it would need to be custom-made.[/quote]
Quote: I think you'd need to use some sort of adapter; I don't know it that adapter already exists or if it would need to be custom-made.
just use the calc to computer that comes with it and out one of those usb extension cords on the end. |
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NETWizz
Byte by bit
Bandwidth Hog
Joined: 20 May 2003
Posts: 2369
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| Posted: 27 Apr 2005 05:51:46 pm Post subject: |
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DigiTan wrote: I was about to say it'd be a longshot but it turns out there are many PIC controllers that support full-speed USB 1.1 and 2.0. All of them sell for under $10, so if someone could get their hands on one, I guess using a mem stick would be a matter of writing a program to do all the FAT32 work and handshaking. I'm guessing the calc already has routines for handshaking since the cable works, so the hard part should be the FAT32 stuff.
Also, if you can use ASM to get full control of the USB port, you might be able to do it without an external equipment--assuming the calc can use full-speed mode. I couldn't find much hard data on these flash sticks but CompuPhase covers some of them in one of their articles. Awesome idea! If someone could pull it off, it might be the best calc mod of all time!
I don't think you would actually format it FAT or FAT32.
I think you would just do a RAW write to it. |
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Redline
Newbie
Joined: 15 Apr 2005
Posts: 10
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| Posted: 27 Apr 2005 08:32:30 pm Post subject: |
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Quote: I don't think you would actually format it FAT or FAT32.
I think you would just do a RAW write to it.
You would have to! The only roadblock that I see is that can the flash be paged like the internal flash can? And are there more than 65535 pages on the flash drive? I'm not that good at hardware/assembler yet so I might be asking basic questions... |
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DigiTan
Unregistered HyperCam 2
Super Elite (Last Title)
Joined: 10 Nov 2003
Posts: 4468
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| Posted: 27 Apr 2005 09:19:38 pm Post subject: |
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| I'm mostly concerned about the protocol. I'm pretty sure all these thumb drive makers use their own proprietary methods for handshaking and addressing, etc. So far I've found bubkis on this. I'll look into it more this summer when I have some free time. |
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