[amsat-bb] Re: [SPAM] Re: LVB tracker display problem

[Gould Smith]

Hello Andrew,

The R/W line to the HD44780 LCD controller allows you to switch between 
write and read data from the LCD.  There are commands to get data from 
CGRAM, read DDRAM  and also read the Busy flag.  All of Howard's code for 
LVB Tracker is on his web site.  http://www.g6lvb.com

73,
Gould, WA4SXM
----- Original Message ----- 
From: "Andrew Rich" <vk4tec at people.net.au>
To: "Howard Long" <howard at howardlong.com>; <heliox694-iw1dtu at yahoo.com>; 
"'AMSAT'" <amsat-bb at amsat.org>
Sent: Sunday, January 13, 2008 2:25 PM
Subject: [amsat-bb] Re: [SPAM] Re: LVB tracker display problem


> Howard,
>
> How does the LVB detect an LCD presence ?
>
> In all the LCD programming I have ever done, it has been just logic levels
> towards the LCD.
>
> Nothing in return ?
>
> Are you talking to the LCD CPU ?
>
>
> ----------------------------------------------------------------------------
> Andrew Rich VK4TEC
> vk4tec at people.net.au <mailto:vk4tec at people.net.au>
> http://www.tech-software.net
>
>
>
>
> -----Original Message-----
> From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org]On
> Behalf Of Howard Long
> Sent: Sunday, 13 January 2008 7:53 PM
> To: heliox694-iw1dtu at yahoo.com; 'AMSAT'
> Subject: [SPAM] [amsat-bb] Re: LVB tracker display problem
> Importance: Low
>
>
> Hi Fer
>
>>  I just finish to build an LVB tracker for a friend
>> of mine. All works fine with NOVA but during a satellite
>> pass the display stuck as in the picture:
>
> I am not aware of a similar problem occuring. I wonder if it is possible 
> to
> temporarily try a different display?
>
> There is a section of code that attempts to detect whether an LCD exists 
> or
> not, for those who don't use the LCD option. If at any point it takes more
> than 5ms to get a response from the LCD the software assumes there isn't 
> one
> there and won't attempt to update the display again, until the tracker is
> reset.
>
> However, looking at the display, it looks like the LCD may have somehow
> reset itself. This could make the software think that the LCD has been
> removed: a special startup sequence is needed to configure these LCDs 
> after
> a reset.
>
> Again, try a different LCD if possible, then check the power supply to the
> LCD is nice and stable without any glitches.
>
> Also, if you simply press the reset push button, rather than cycle the
> power, does the display work correctly then? This initiates the LCD
> reconfiguration.
>
> 73, Howard G6LVB
>
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