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Hai all, I need the hardware details of how to interface a LCD (2x16) nibble mode with ADSP-2181 processor. Like pin details. How to write the data using ADSP-2181 from IO memory to LCD et.c I saw only one document tht i found some wht useful from AD site but tht not too fully. where can i get example programe of writing the data using LCD. In Ez-kit wht all things are data pins.how can i determine the pins as there is no marking like pin1,pin2,............. and so on. Also which are data pins , control pins ? regards Girish ________________________________________________________________________ Yahoo! Messenger - Communicate instantly..."Ping" your friends today! Download Messenger Now http://uk.messenger.yahoo.com/download/index.html |
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LCD interfacing with ADSP-2181
Started by ●June 21, 2004
Reply by ●June 21, 20042004-06-21
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On Mon, 21 Jun 2004, [iso-8859-1] Girish wrote: > I need the hardware details of how to interface a LCD > (2x16) nibble mode with ADSP-2181 processor. > > Like pin details. How to write the data using > ADSP-2181 from IO memory to LCD et.c > > I saw only one document tht i found some wht useful > from AD site but tht not too fully. > > where can i get example programe of writing the data > using LCD. > > In Ez-kit wht all things are data pins.how can i > determine the pins as there is no marking like > pin1,pin2,............. and so on. > > Also which are data pins , control pins ? Howdy Girish, The best place to start is at an LCD manufacturer's web site. They all use the same interface so they can compete with each other for drop in replacement. You might need some glue logic but it won't be much - a chip select from some address decoder and the read and write lines are all you need along with 4 data lines. Start with the LCD side and see what you've got on the EZ kit that will map to it. Should be pretty easy. Your real problem will be timing. The DSP is probably way too fast. So make sure you know what the LCD timing requirements are and set up your glue logic to meet it. Patience, persistence, truth, Dr. mike |
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Reply by ●June 21, 20042004-06-21
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I have interfaced 16 x 2 LCDs to a 2181. You need to either use the IO ports directly (not the data bus) or use something like a 74574 to create ports from the data bus. You can not add enough wait states to be slow enough for an LCD module. You should also use buffers if the LCD is far from the DSP (perhaps connected via a long ribbon cable). Al At 08:18 AM 6/21/2004, you wrote: >On Mon, 21 Jun 2004, [iso-8859-1] Girish wrote: > > > I need the hardware details of how to interface a LCD > > (2x16) nibble mode with ADSP-2181 processor. > > > > Like pin details. How to write the data using > > ADSP-2181 from IO memory to LCD et.c > > > > I saw only one document tht i found some wht useful > > from AD site but tht not too fully. > > > > where can i get example programe of writing the data > > using LCD. > > > > In Ez-kit wht all things are data pins.how can i > > determine the pins as there is no marking like > > pin1,pin2,............. and so on. > > > > Also which are data pins , control pins ? > >Howdy Girish, > >The best place to start is at an LCD manufacturer's web site. >They all use the same interface so they can compete with each >other for drop in replacement. You might need some glue logic >but it won't be much - a chip select from some address decoder >and the read and write lines are all you need along with 4 >data lines. Start with the LCD side and see what you've got >on the EZ kit that will map to it. Should be pretty easy. > >Your real problem will be timing. The DSP is probably way too >fast. So make sure you know what the LCD timing requirements >are and set up your glue logic to meet it. > >Patience, persistence, truth, >Dr. mike > >_____________________________________ >Note: If you do a simple "reply" with your email client, only the author >of this message will receive your answer. You need to do a "reply all" if >you want your answer to be distributed to the entire group. > >_____________________________________ >About this discussion group: > >To Join: Send an email to > >To Post: Send an email to > >To Leave: Send an email to > >Archives: http://groups.yahoo.com/group/adsp > >Other Groups: http://www.dsprelated.com/groups.php3 > >Yahoo! Groups Links > > Al Clark Danville Signal Processing, Inc. -------------------------------- comp.dsp conference July 28 - Aug 1, 2004 details at http://www.danvillesignal.com/index.php?id=compdsp email: Who says you can't teach an old dog a new DSP trick? |
