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LPC2103 and HD44780 based LCD

Started by Lucas Caldoncelli Rodrigues February 25, 2008
Hello!

I'm using a HD44780 based LCD with a LPC2103.
The LCD power supply is 5V and Output I/O values of LPC2103 are 3.3V .

Reading about this LCD, the Input "high" voltage is 2.2v min, so it is
tolerant. But somehow, all of a sudden, the LCD lose its Synchronism and
shows strange characters or just turn off characters.

If I execute the startup routine again, LCD comes back to normal.
The interface with the uC is 4-bit mode.

I allready re-writed the routines and used other people routines to
control the LCD but without success.

Can anyone helpme?

Best Regards
Lucas

--
Att
Lucas Caldoncelli Rodrigues
OHM Technology
Depto. Tnico
(41) 3019-1014
(41) 8848-2255
(41) 9975-7451
www.ohmtech.com.br

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contidas.

An Engineer's Guide to the LPC2100 Series

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TCC QUE ORIENTEI!
To: l...From: l...@ohmtech.com.brDate: Mon, 25 Feb 2008 11:18:50 -0300Subject: [lpc2000] LPC2103 and HD44780 based LCD

Hello!I'm using a HD44780 based LCD with a LPC2103.The LCD power supply is 5V and Output I/O values of LPC2103 are 3.3V .Reading about this LCD, the Input "high" voltage is 2.2v min, so it is tolerant. But somehow, all of a sudden, the LCD lose its Synchronism and shows strange characters or just turn off characters.If I execute the startup routine again, LCD comes back to normal.The interface with the uC is 4-bit mode.I allready re-writed the routines and used other people routines to control the LCD but without success.Can anyone helpme?Best RegardsLucas-- AttLucas Caldoncelli RodriguesOHM TechnologyDepto. Tnico(41) 3019-1014(41) 8848-2255(41) 9975-7451www.ohmtech.com.brEsta mensagem pode conter informao confidencial.Se vocn for o destinatio ou a pessoa autorizada a receber esta mensagem, n poderusar, copiar ou divulgar as informaes nelacontidas.

_________________________________________________________________
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Works like charm on my LPC2136, please ensure that on display,
1. WRT line is grounded.
2. There is a small delay in ENABLE strobe.
3. RS line is DATA mode.

Warm Regards,

Mukund Deshmukh,
Beta Computronics Pvt Ltd.
10/1 IT Park, Parsodi,
Nagpur -440022 India.
Web site - http://betacomp.com

MEET US AT,

Chinaplas 2008, Shanghai, China.
Hall E3, Booth P49

Hello!I'm using a HD44780 based LCD with a LPC2103.The LCD power supply is
5V and Output I/O values of LPC2103 are 3.3V .Reading about this LCD, the
Input "high" voltage is 2.2v min, so it is tolerant. But somehow, all of a
sudden, the LCD lose its Synchronism and shows strange characters or just
turn off characters.If I execute the startup routine again, LCD comes back
to normal.The interface with the uC is 4-bit mode.I allready re-writed the
routines and used other people routines to control the LCD but without
success.Can anyone helpme?Best RegardsLucas-- AttLucas Caldoncelli
RodriguesOHM TechnologyDepto. Tnico(41) 3019-1014(41) 8848-2255(41)
9975-7451www.ohmtech.com.brEsta mensagem pode conter informao
confidencial.Se vocn for o destinatio ou a pessoa autorizada a receber
esta mensagem, n poderusar, copiar ou divulgar as informaes
nelacontidas.

_________________________________________________________________
Cansado de espa para s50 fotos? Conhe o Spaces, o site de
relacionamentos com at6,000 fotos!
http://www.amigosdomessenger.com.br
LUCAS,
FUNCIONOU 100% O LCD CONOSCO.
DA UMA OLHADA NO TCC DE MEU ALUNO
http://www.inf.furb.br/~maw/arm_tcc/
TCPIPCHIP

Aproveitando, visite minha pagina www.basic4ever.com

To: l...From: l...@ohmtech.com.brDate: Mon, 25 Feb 2008 11:18:50 -0300Subject: [lpc2000] LPC2103 and HD44780 based LCD

Hello!I'm using a HD44780 based LCD with a LPC2103.The LCD power supply is 5V and Output I/O values of LPC2103 are 3.3V .Reading about this LCD, the Input "high" voltage is 2.2v min, so it is tolerant. But somehow, all of a sudden, the LCD lose its Synchronism and shows strange characters or just turn off characters.If I execute the startup routine again, LCD comes back to normal.The interface with the uC is 4-bit mode.I allready re-writed the routines and used other people routines to control the LCD but without success.Can anyone helpme?Best RegardsLucas-- AttLucas Caldoncelli RodriguesOHM TechnologyDepto. Tnico(41) 3019-1014(41) 8848-2255(41) 9975-7451www.ohmtech.com.brEsta mensagem pode conter informao confidencial.Se vocn for o destinatio ou a pessoa autorizada a receber esta mensagem, n poderusar, copiar ou divulgar as informaes nelacontidas.

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