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 Posted: Feb 02, 2012 - 09:14 PM |
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Joined: Dec 09, 2010
Posts: 153
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hello
any one ever tried interfacing a touch screen color lcd display on AVR ICs like mega32?
it has a driver ILI9325. |
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Posted: Feb 02, 2012 - 09:36 PM |
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Joined: Mar 28, 2001
Posts: 20400
Location: Sydney, Australia (Gum trees, Koalas and Kangaroos, No Edelweiss)
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I have used the code from www.circuitidea.com
You will need to change the init a possibly a few other bits for your driver chip.
Depending on what you want to do with your LCD you may find that you don't have enough memory to, say, have some icons in flash. Also the displays run at 3.3V max so you either run the M32 at 3.3V and limit your clock to 8MHz (pretty slow if the display is largish) or run the M32 at 5V, use level shifters and run at full speed of 16MHz. |
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John Samperi
Ampertronics Pty. Ltd.
www.ampertronics.com.au
* Electronic Design * Custom Products * Contract Assembly
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Posted: Feb 02, 2012 - 09:58 PM |
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Joined: Feb 19, 2001
Posts: 25923
Location: Wisconsin USA
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Quote:
either run the M32 at 3.3V and limit your clock to 8MHz (pretty slow if the display is largish) or run the M32 at 5V, use level shifters and run at full speed of 16MHz...
...or get into the new millennium and use e.g. Mega644PA (to gain more flash space) and run at ~12MHz @3.3V. |
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Posted: Feb 02, 2012 - 10:30 PM |
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Joined: Mar 28, 2001
Posts: 20400
Location: Sydney, Australia (Gum trees, Koalas and Kangaroos, No Edelweiss)
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...or even better use a Xmega @32MHz... Or a.....  |
_________________
John Samperi
Ampertronics Pty. Ltd.
www.ampertronics.com.au
* Electronic Design * Custom Products * Contract Assembly
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Posted: Feb 03, 2012 - 07:23 PM |
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Joined: Dec 09, 2010
Posts: 153
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| thanks people, i found a function liberary for it, currently i am running tests with a mega32L working with 24MHz and 3.3 volts! will report back after achieving better more useful results. |
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Posted: Feb 03, 2012 - 07:31 PM |
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Joined: Nov 02, 2009
Posts: 3239
Location: Zelenograd, Russia
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"mega32L working with 24MHz and 3.3 volts" sounds promising for an IgNobel prize  |
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Warning: Grumpy Old Chuff. Reading this post may severely damage your mental health.
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Posted: Feb 03, 2012 - 09:34 PM |
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Joined: Mar 28, 2001
Posts: 20400
Location: Sydney, Australia (Gum trees, Koalas and Kangaroos, No Edelweiss)
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Now control yourself Mbedder. I know it's hard.
whiteman7777 have you looked at the datasheet of the M32L running at 3.3V? What is the maximum clock frequency which can be used at that voltage? Are you just going to make a one off for experimentation?
hint: bottom of first page-Speed grades |
_________________
John Samperi
Ampertronics Pty. Ltd.
www.ampertronics.com.au
* Electronic Design * Custom Products * Contract Assembly
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Posted: Feb 04, 2012 - 09:01 PM |
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Joined: Dec 09, 2010
Posts: 153
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Designers usually introduce attitudes of their architectural works with a “reduce for insurance” quantities so people would not come and say "hey your atmega32L at 24MHz failed me you ****"
it was working at 24MHz but i reduced it to 20MHz because it had failures often, currently it is working at 20MHz crystal resonated clock frequency and 3.3 supply voltage very nicely!
will report back if any thing interesting achieved. |
Last edited by whiteman7777 on Feb 04, 2012 - 09:13 PM; edited 2 times in total
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Posted: Feb 04, 2012 - 09:05 PM |
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Joined: Dec 09, 2010
Posts: 153
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i wonder if there are any member of AVR family with CK frequency more than 30MHz confirmed??
is it too different working with Xmegas? are registers and workings changed a lot?
what examples can you represent? |
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Posted: Feb 04, 2012 - 09:58 PM |
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Joined: Dec 09, 2010
Posts: 153
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| i wonder if any one is moderating these forums, i would certainly like to report some Russian trolls around. |
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Posted: Feb 04, 2012 - 10:15 PM |
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Joined: Mar 27, 2002
Posts: 18599
Location: Lund, Sweden
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Quote:
i wonder if any one is moderating these forums
The moderators for each forum is mentioned at the top right of every forum thread listing. One of them has participated in this thread already.  |
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Posted: Feb 04, 2012 - 11:17 PM |
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Joined: Jan 30, 2005
Posts: 853
Location: Junction City, OR USA
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whiteman7777
It may be hard to believe, but Mbedder is being very polite.
Thicken thy skin, knave. |
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Posted: Feb 04, 2012 - 11:47 PM |
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Joined: Nov 09, 2001
Posts: 270
Location: Serbia
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Posted: Feb 05, 2012 - 05:32 AM |
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Joined: Dec 09, 2010
Posts: 153
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you know genius people like me are very sensitive 
@avra: yes utilizing a ATxmega128A1, it seems to fit nice with its flash memory, operation voltage and clock range, but its a SMD part and hard to put on a PCB, also i dont know if it is so different working with Xmega series? i have never tried it. |
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Posted: Feb 06, 2012 - 10:09 AM |
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Joined: Nov 09, 2001
Posts: 270
Location: Serbia
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Posted: Mar 31, 2012 - 10:58 PM |
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Joined: Dec 09, 2010
Posts: 153
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| thank people, i could drive it a while ago, its interesting that the AVR chip should be programmed a couple of times with the same hex code on it, i dont know perhaps the problem is some thing else??!! its confusing. |
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Posted: Apr 10, 2013 - 11:46 PM |
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Joined: Nov 11, 2003
Posts: 3904
Location: Chicago Illinois USA
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| Um, How did you wire your ELT240320ATP to the atmega? I'm looking at the PDF datasheet listing pins 1 through 37, and neither DB0 or DB9 are listed. Perhaps you have more correct information on this display? Hope? |
_________________
Discursive design,
Torby
Some days, it's just not worth chewing through the restraints.
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Posted: Apr 10, 2013 - 11:56 PM |
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Joined: Mar 28, 2001
Posts: 20400
Location: Sydney, Australia (Gum trees, Koalas and Kangaroos, No Edelweiss)
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Quote:
DB0 or DB9 are listed.
They are not used in 16 bit mode, so you have 1-8, 10 to 17 from memory. |
_________________
John Samperi
Ampertronics Pty. Ltd.
www.ampertronics.com.au
* Electronic Design * Custom Products * Contract Assembly
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Posted: Apr 11, 2013 - 03:03 AM |
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Joined: Nov 11, 2003
Posts: 3904
Location: Chicago Illinois USA
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| Really? I'll look at the chip doc again. Sounds like the module intends 16 bit mode then. Oh. Mystery solved. |
_________________
Discursive design,
Torby
Some days, it's just not worth chewing through the restraints.
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