[Icc-avr] 4-line LCD display

[Johannes Assenbaum]

For lines 3 & 4, HD44780-like controllers not have enough pins and use an extension driver ic. So your problem actually can be hardware, more concretely: on LCD pcb somewhere between controller and driver, including the chips.


> Lines 3 & 4 go into gobbledigoog immediately after initialisation, and
> never recover to normal operation. Lines 1 & 2 are always perfectly
> alright (this also answers Bob's remark). No difference in contrast.


> ________________________________

> From: icc-avr-bounces at imagecraft.com
> [mailto:icc-avr-bounces at imagecraft.com] On Behalf Of Sylvain Bissonnette
> Sent: Monday, January 28, 2008 02:40 PM
> To: Discussion list for ICCAVR and ICCtiny Users. You do NOT
> needtosubscribetoicc-announce if you are a member of this.
> Subject: Re: [Icc-avr] 4-line LCD display


> Did you 2 line have the same contrast if not your initialization is not
> good both line must look
> identical

> Sylvain

> 	----- Original Message -----
> 	From: Albert vanVeen <mailto:Albert.vanVeen at pertronic.co.nz>
> 	To: Discussion list for ICCAVR and ICCtiny Users. You do NOT
> needtosubscribeto icc-announce if you are a member of this.
> <mailto:icc-avr at imagecraft.com>
> 	Sent: Sunday, January 27, 2008 8:13 PM
> 	Subject: [Icc-avr] 4-line LCD display

> 	Occasionally, but too often to ignore we have problems with 4x40
> lcd displays: the borrom 2 lines display 'garbage'. No amount of
> debugging and timing experiments have shown up anything so far, and the
> conclusion "it must be a hardware problem" is tempting, but why then
> would always the bottom half fail, as these 2 halfs are completely
> identical?

> 	Any ideas?

> 	Albert.





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