Post by thread:LCD Displays

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'Lcd Displays'
1995\11\20@202729 by avdeal

I'm trying to get some code and so on together, for displaying to a ROHM 16x1 dot matric display. any help would be appreciated.. John P. Hollinghsead ]I[ KB5SXH President Texas Data Systems Pearland, TX spam_OUTavdealTakeThisOuThollingshead.com (713) 485-0394 Fax: (713) 485-8223

1995\11\21@025143 by SONY-OD

on Fri, 10 Nov 1995, John P. Hollinghsead wrote: >I'm trying to get some code and so on together, for displaying to a >ROHM 16x1 dot matric display. >any help would be appreciated.. This is the set of commands for all LCD panel which are driven with the HITACHI HD44780 controller, just check your panel to look at the chip. LCD panel can driven by 4 or 8 bits. There is also 3 lines EN (Enable), D/I (Data/Instruction) and R/W (Read/Write). To connect with a minimum of wires you need 4+3 I/O lines in 4 bit mode. Sequence for signals are as follow 1st 2nd ____ ____ EN ____| |______| |_____ ____ ____ Data ___|____|______|____|______ (4bit mode) d4-d7 d3-d0 LCD panel is drived by an HITACHI controller HD44780 (panel ref: LM054, LM016L, LM020L, LM041L, LM032L, LM044L, LM243A, LM027, LM23A, LM017L, LM018L, etc ...). Commands can be sent in frame of 4 or 8 bits. A reset put the panel in 8 bits mode. 4 bits mode use only bit B4,B5,B6 and B7. Commands: Exec. DI RW b7 b6 b5 b4 b3 b2 b1 b0 1,52ms 0 0 0 0 0 0 0 0 0 1 Reset LCD Panel, Erase RAM 1,52ms 0 0 0 0 0 0 0 0 1 - Cursor + AC=0, Display in origin position 37us 0 0 0 0 0 0 0 1 I/D S Define cursor movment and shift display 37us 0 0 0 0 0 0 1 D C S Display ON/OFF(D), cursor(C) and blonk at cursor position(B) 37us 0 0 0 0 0 1 S/L R/L- - Move the cursor and shift display 37us 0 0 0 0 1 DL N F - - Define bus length (DL), number of line, matrix font used (5x8 or 5x10) 37us 0 0 0 1 CG RAM Address Define CG RAM Address 37us 0 0 1 DD RAM Address Define DD RAM Address 0us 0 1 BF Address counter AC Read busy Flag & AC 37us 1 0 Write DATA Write DATA into DD or CG RAM 37us 1 1 Read DATA Read DATA from DD or CG RAM Legend: I/D = 1: Increment, I/D = 0 : Decrement S = 1: Shift display R/L = 1: Shift to the right; R/L = 0 : Shift to the left DL = 1: 8 Bits; DL = 0 : 4 Bits N = 1: 2 or 4 lines; N = 0 : 1 line F = 1: 5x10 matrix; F = 0 : 5x8 matrix BF = 1: Busy; BF = 0 : free, can receive an instruction DD Ram: Data Display RAM CG Ram: Character Generator RAM Execution time is given for a 270khz clock frequency (250-270Khz seems to be the average value for current LCD panel). RAM is not continuous RAM, mapping depend how many characters and line there is in the panel. You can also define your own characters (CG RAM), only 8 CHR could be defined: for 16x1: 1st line: 00h 01h ... 27h for 16x2: 1st line: 00h 01h ... 27h 2nd line 40h 41h ... 67h Regards, Philippe. <.....sonyedeKILLspam@spam@iway.fr>

1995\11\21@025143 by SONY-OD

'LCD displays'
1996\09\18@213006 by TONY NIXON 54964

I don't know if you have access to a Farnell catalog, but they advertise LCD graphic displays with micro interface. These are from Hitachi and from Varitronix. They appear to have an 8 bit interface to them. Regards Tony

1996\09\18@213006 by TONY NIXON 54964

'LCD Displays'
1997\01\29@125902 by Walter Banks

While we are on a LCD thread. There is 4 and 8 bit parallel C code on our BBS. It is essentially the same as any one of a multitude of other code packages except it is written in C and the same source works on 9 or 10 embedded system platforms with no changes other than port definitions. Does anyone have a favorite graphics display with 64 *128 to 128 * 256 resolution? How about touch overlays? Walter Banks

1997\01\30@072313 by Frank A. Vostenbosch

> From: Walter Banks <.....walterKILLspam.....BYTECRAFT.COM> > > While we are on a LCD thread. There is 4 and 8 bit parallel > C code on our BBS. It is essentially the same as any one > of a multitude of other code packages except it is written > in C and the same source works on 9 or 10 embedded system > platforms with no changes other than port definitions. > > Does anyone have a favorite graphics display with 64 *128 to > 128 * 256 resolution? How about touch overlays? I use a Sony display with 128x64 resolution which uses an 8-bit interface. It needs quite a few control lines (6 IIRC), partly because it's made for a 6800 bus interface, and partly because the left and right hand sides of the display have a separate enable input. Built-in commands are quite limited (i.e. no character mode, no horizontal panning) but usable. If enough people request it, I'll post PIC code for the (proportional) text font that I'm using. Frank ------------------------------------------------------------------------ Frank A. Vorstenbosch Phone: +44-181-941 7899 Electronics & Software Engineer Mobile: +44-976-430 569 Eidos Technologies Ltd., Hampton, Middx Fax: +44-181-941 7895

1997\01\30@103528 by Walter Banks

Frank, > If enough people request it, I'll post PIC code for the (proportional) > text font that I'm using. I am interested in seeing the code for it. Walter Banks

'LCD displays'
1997\07\11@102408 by Andy Kunz

To all who expressed interest in the 7-segment, 4-digit LCD we are offering: Latest shipment has arrived. Price is $4.50 each + shipping. Anybody still needing a data sheet should request private, please - there's a snafu with my ISP preventing the downloading off my page. Dealer inquiries are invited. Info, etc: EraseMEmontanaspam_OUTTakeThisOuTfast.net Andy ================================================================== Andy Kunz - Montana Design - 409 S 6th St - Phillipsburg, NJ 08865 Hardware & Software for Industry & R/C Hobbies "Go fast, turn right, and keep the wet side down!" ==================================================================

'LCD displays'
1997\10\09@190500 by TONY NIXON 54964

Does any one know of links for LCD display availability? I need one similar in size to a watch display for an upcoming project. Regards Tony But for venetian blinds, it would be curtains for all of us....

1997\10\10@094611 by Martin R. Green

I don't know if anyone else has thought of this, but just about now there should be a wealth of dead Tamagotchi displays at the bottom of toyboxes everywhere. I have no idea how difficult they would be to drive, but they ar basically just a small dot matrix display with a few custom icons that you can just ignore. Anybody tried interfacing one of these yet? Martin R. Green elimarspam_OUTbigfoot.com On Fri, 10 Oct 1997 08:46:42 +1000, TONY NIXON 54964 <@spam@Tony.nixonKILLspamENG.MONASH.EDU.AU> wrote: >Does any one know of links for LCD display availability? > >I need one similar in size to a watch display for an upcoming project. > >Regards > >Tony > > >But for venetian blinds, it would be curtains for all of us....

1997\10\10@104556 by Andrew Warren

Martin R. Green <KILLspamPICLISTKILLspamMITVMA.MIT.EDU> wrote: > I don't know if anyone else has thought of this, but just about now > there should be a wealth of dead Tamagotchi displays at the bottom > of toyboxes everywhere. I have no idea how difficult they would be > to drive, but they ar basically just a small dot matrix display with > a few custom icons that you can just ignore. > > Anybody tried interfacing one of these yet? Martin: I haven't looked closely at those displays, but if they're anything like the overwhelming majority of wristwatch LCD displays, they're designed for 1/2 bias. Unfortunately, the PIC16C9xx devices only support 1/3 bias. -Andy === Andrew Warren - RemoveMEfastfwdTakeThisOuTix.netcom.com === Fast Forward Engineering - Vista, California === http://www.geocities.com/SiliconValley/2499

1997\10\10@105419 by Martin R. Green

Sorry, you've lost me there, 1/2 bias, 1/3 bias, please elaborate. Also, I wasn't necessarily thinking of the 16C9xx series, couldn't you drive these via a cmos latching shift register driven by a PIC, as long as you invert the signal to the LCD at a constant rate? TIA - Martin R. Green spamBeGoneelimarspamBeGonebigfoot.com On Fri, 10 Oct 1997 07:45:02 -0800, Andrew Warren <TakeThisOuTfastfwdEraseMEspam_OUTIX.NETCOM.COM> wrote: {Quote hidden}>Martin R. Green <RemoveMEPICLISTTakeThisOuTMITVMA.MIT.EDU> wrote: > >> I don't know if anyone else has thought of this, but just about now >> there should be a wealth of dead Tamagotchi displays at the bottom >> of toyboxes everywhere. I have no idea how difficult they would be >> to drive, but they ar basically just a small dot matrix display with >> a few custom icons that you can just ignore. >> >> Anybody tried interfacing one of these yet? > >Martin: > >I haven't looked closely at those displays, but if they're anything >like the overwhelming majority of wristwatch LCD displays, they're >designed for 1/2 bias. Unfortunately, the PIC16C9xx devices only >support 1/3 bias. > >-Andy > >=== Andrew Warren - fastfwdEraseME.....ix.netcom.com >=== Fast Forward Engineering - Vista, California >=== http://www.geocities.com/SiliconValley/2499

1997\10\11@110430 by Mike Smith

-----Original Message----- From: Martin R. Green <EraseMEelimarBIGFOOT.COM> To: RemoveMEPICLISTEraseMEEraseMEMITVMA.MIT.EDU <RemoveMEPICLISTspam_OUTKILLspamMITVMA.MIT.EDU> Date: Friday, 10 October 1997 23:17 Subject: Re: LCD displays >I don't know if anyone else has thought of this, but just about now >there should be a wealth of dead Tamagotchi displays at the bottom of >toyboxes everywhere. I have no idea how difficult they would be to >drive, but they ar basically just a small dot matrix display with a >few custom icons that you can just ignore. > >Anybody tried interfacing one of these yet? > And has anyone made a tamagotchi clone with a pic? Or, better yet, an electronic 'nanny' for one? What micro do they use, these passing strange toys? MikeS <RemoveMEmikesmith_ozTakeThisOuTspamrelaymail.net>

'LCD displays'
1998\02\20@202717 by Ron Kreymborg

Hi PICsters, I need some help please. I am trying to write the code to drive a standard 2-line by 16 character lcd display from first principles (ie from the data sheet). I know about Scott Edwards products but in Australia with shipping costs we're talking $10 local $80 SE. While I am new to PICs I have been programming for many years. The attached 16F84 program probably contains some subtle blunder I have missed, but I have been working on it for many hours. I am prepared to be embarassed. The problem is the display doesn't do a thing. Not one dot. I have several displays, some with surface mount chips (Toshiba T7934), some with globs of epoxy. Otherwise they are physically the same. In each case the pinouts are a row of 16 pads down one side: 1 Vss 5 R/W 9 DB2 13 DB6 2 Vdd 6 E 10 DB3 14 DB7 3 Vo 7 DB0 11 DB4 15 v+ 4 RS 8 DB1 12 DB5 16 V- Pin 2 is logic 5V, pin 3 is lcd v+. On some boards pins 15 & 16 power the backlight, on others they are not defined. Because all the boards have this same pinout and nomenclature, I have assumed they all share the same instructions and timing requirements. The few spec sheets I have seem to verify this. I have a detailed T7934 spec sheet that backgrounds the skimpy sheets that come with the lcds. I have an oscilloscope and have verified the timing right at the pads. The setup and hold times are all sub-microsecond for the lcds, so shouldn't be a factor for a 4Mhz '84. Sorry for all the words but just trying to fill in the background. I sure would appreciate some comments. Thanks Ron ;****************************************************************** ; ; Sample routines to display on a 2x16 character LCD display. ; Assumes a T7934 type lcd driver. ; ;****************************************************************** title "Test 2x16 LCD Routines" list p=pic16f84,r=dec,n=80,x=off,st=off include <p16f84.inc> errorlevel -302 ; no bank warnings dotime macro arg1 movlw arg1 call wait endm lcd macro arg1 movlw arg1 call xlcd endm strb macro arg1 bsf STATUS,rp0 movlw arg1 movwf TRISB bcf STATUS,rp0 endm ; Data - cblock 0x0c ; start of data area dval_1 dval_2 flags conword endc ; Flags - bflag equ 0 rsflag equ 1 ; I/O portB - BUSY equ 7 ; input - LCD is busy (0x80) R_W equ 3 ; output - LCD Read/Write (0x08) RS equ 2 ; output - Register Select (0x04) E equ 1 ; output - LCD Enable (0x02) start clrf PORTA clrf PORTB bsf STATUS,rp0 movlw b'00000000' ; all outputs and low to start movwf TRISA movwf TRISB bcf STATUS,rp0 ; Power up sequence is as per T7934 spec: main bcf flags,rsflag ; clear RS flag dotime 20 ; 20mSec power up delay movlw b'00110000' ; set function (8-bit) movwf PORTB call pulse dotime 5 ; 5mSec wait call pulse dotime 1 call pulse ; Power up resets are done movlw b'00100000' ; set for 4-bit movwf PORTB call pulse lcd b'00101000' ; 4-bits, 2-lines, 5x7 lcd b'00001100' ; display on lcd b'00000001' ; clear display lcd b'00000110' ; increment, no display shift ; Output some characters loop lcd b'10000000' ; address 0 bsf flags,rsflag ; set RS high lcd "T" lcd "e" lcd "s" lcd "t" lcd "i" lcd "n" lcd "g" lcd "." bcf flags,rsflag ; RS low dotime 100 goto loop ; write 'em again ; Check whether the LCD is busy. Loop until it isn't. When ; it's free output the byte passed in W, MS nibble first. xlcd movwf conword ; save control word strb b'11110000' ; RB7-4 as inputs for busy movlw 1 << R_W movwf PORTB ; set up for read xlcda bcf flags,bflag ; assume not busy bsf PORTB,E ; clock high nop ; little wait btfsc PORTB,BUSY ; busy set? bsf flags,bflag ; yes bcf PORTB,E ; clock low nop ; little wait nop call pulse ; get low bits but ignore (for now) btfsc flags,bflag ; was it busy? goto xlcda ; yes strb b'00000000' ; RB7-4 outputs again movf conword,w ; get word to send call xlcdb ; send high nibble swapf conword,w ; get word again xlcdb andlw 0xf0 ; just high bits (clears all control bits) movwf PORTB btfsc flags,rsflag ; was RS set? bsf PORTB,RS ; yes call pulse ; write current nibble return pulse bsf PORTB,E nop bcf PORTB,E return wait movwf dval_1 ; passed value is in mSec addwf dval_1,f ; correct for this routine del1 movlw 0xa4 ; 0xa4 @ 4Mhz movwf dval_2 del2 decfsz dval_2,f goto del2 decfsz dval_1,f goto del1 return end ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Ron Kreymborg Computer Systems Manager Monash University CRC for Southern Hemisphere Meteorology Wellington Road Clayton, VIC 3168 Phone : 061-3-9905-9671 Australia Fax : 061-3-9905-9689 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

1998\02\20@215014 by David Lions

Ron Kreymborg wrote: > > Hi PICsters, > > I need some help please. I am trying to write the code to drive a standard > 2-line by 16 character lcd display from first principles (ie from the data > sheet). This is probably an industry standard character LCD, based on Hitchi 44780 chip. There are huge amounts of info on driving these, and sample code for PIC's. Try first : http://www.iaehv.nl/users/pouweha/lcd.htm and then search for the "LCD FAQ", and look in the piclist archive...

1998\02\23@194524 by Ron Kreymborg

Thanks to all those who replied. As Lynn said, it's probably in your hardware. I had not realised the Vo lcd voltage was Vss referenced or that the display was only visible over such a small range. The optimum Vo voltage seems to be around 0.47V, with all pixels on at 0.3V and all off at 1.5V. I didn't have a potentiometer handy and so for many hours laboured over software with Vo tied to Vdd! Ron On Sat, 21 Feb 1998, Lynn Richardson wrote: > It may not be just a program problem, Ron. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Ron Kreymborg Computer Systems Manager Monash University CRC for Southern Hemisphere Meteorology Wellington Road Clayton, VIC 3168 Phone : 061-3-9905-9671 Australia Fax : 061-3-9905-9689 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

'LCD Displays'
1998\12\19@180618 by Bill Kichman

Hello group, I am new to the PICLIST and have a general design question. I am interested in designing an application using a PIC to, among other things, control graphic display on one of the newer type graphic (possibly with touch screen) LCD displays. Does this seem possible using a PIC, given the high density of data for the required graphic images? Should it be possible with a few EPROMS for the display data? Obviously I am in the initial design stage and need to consider all the most feasible options before jumping right in. The purpose of the display is to provide feedback from monitored sensors, probably handled by a separate PIC. Any input is greatly appreciated. Regards Bill <So much to do, So little time> Kichman

'LCD Displays'
1999\11\16@201808 by Andrew T Kelley

I picked up two lcd displays a flea market. They have markings on them. They are on the back: "SSI" Is this the manufacturer? "M1632" or "MI632" I cannot tell Model number They have 14 pin two row headers on them. It has a backlight(?) too, I think. They have HD44780A00 and HD44100H chips on the back Any information would be appreciated( data sheets,links, etc.. ) Andrew K. EraseMEK_AndrewspamspamBeGonejuno.com ___________________________________________________________________ Get the Internet just the way you want it. Free software, free e-mail, and free Internet access for a month! Try Juno Web: dl.http://www.juno.com/dynoget/tagj.

1999\11\16@204540 by Wagner Lipnharski

Hey Andrew, take a look at http:/http://www.ustr.net and select LCD page. There are lots of information about it. Your LCD is a common 44780 driven LCD (the most common). Should work nicely. Good Luck. The HD44780 is the controller chip, while the HD44100 is the extension for more digits... :) Wagner. Andrew T Kelley wrote: {Quote hidden}> > I picked up two lcd displays a flea market. > They have markings on them. They are on the back: > > "SSI" > Is this the manufacturer? > > "M1632" or "MI632" I cannot tell > Model number > > They have 14 pin two row headers on them. It has a backlight(?) too, I > think. > They have HD44780A00 and HD44100H chips on the back > > Any information would be appreciated( data sheets,links, etc.. ) > > Andrew K. > RemoveMEK_AndrewKILLspamjuno.com

1999\11\16@204547 by Nick Taylor

Andrew, Peer Ouwehand's site has probably the most complete HD44780 LCD info: http://www.iaehv.nl/users/pouweha/lcd.htm Have fun, - Nick - Andrew T Kelley wrote: {Quote hidden}> > I picked up two lcd displays a flea market. > They have markings on them. They are on the back: > > "SSI" > Is this the manufacturer? > > "M1632" or "MI632" I cannot tell > Model number > > They have 14 pin two row headers on them. It has a backlight(?) too, I > think. > They have HD44780A00 and HD44100H chips on the back > > Any information would be appreciated( data sheets,links, etc.. ) > > Andrew K. > K_AndrewSTOPspamspam_OUTjuno.com > > ___________________________________________________________________ > Get the Internet just the way you want it. > Free software, free e-mail, and free Internet access for a month! > Try Juno Web: dl.http://www.juno.com/dynoget/tagj.

1999\11\16@210132 by Andrew

Hi, I have a lcd module with a NEC (i think) 7227 chip on it, I can't find any info on the chip, has anyone got any info or know where I can get specs etc.. Thanks in advance Andrew Thoms Andrew T Kelley wrote: {Quote hidden}> I picked up two lcd displays a flea market. > They have markings on them. They are on the back: > > "SSI" > Is this the manufacturer? > > "M1632" or "MI632" I cannot tell > Model number > > They have 14 pin two row headers on them. It has a backlight(?) too, I > think. > They have HD44780A00 and HD44100H chips on the back > > Any information would be appreciated( data sheets,links, etc.. ) > > Andrew K. > spamBeGoneK_AndrewSTOPspamEraseMEjuno.com > > ___________________________________________________________________ > Get the Internet just the way you want it. > Free software, free e-mail, and free Internet access for a month! > Try Juno Web: dl.http://www.juno.com/dynoget/tagj.

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