Re: [Lcd4linux-devel] I2C modifications to HD44780 driver

[Paul K. <pau...@xs...>]

Hi Luis,

I found the problem. The wire configuration is not read correctly from 
the config file. It uses the default all the time. (and I have RS/RW 
wired differently)
This is how my display definition is constructed:

Display HD44780-I2C {
    Driver 'HD44780'
    Bus 'i2c'
    Port '/dev/i2c-0'
    Device '38'
    Bits '4'
    Size '16x2'
    asc255bug 0
    Icons 1
    Wire {
        RW     'DB4'
        RS     'DB5'
        ENABLE 'DB6'
        GPO    'GND'
    }
}

Is that correct?
I noticed that the Section and Driver strings are allways empty strings 
in drv_generic_i2c.c is that correct?

thanks,

Paul


Luis.F.Correia wrote:

>Hi Paul! 
>
>  
>
>>-----Original Message-----
>>From: Paul Kamphuis [mailto:pau...@xs...] 
>>Sent: Wednesday, March 30, 2005 8:01 AM
>>To: Luis Correia; lcd4linux devel
>>Subject: Re: [Lcd4linux-devel] I2C modifications to HD44780 driver
>>
>>Hi Luis and Michael,
>>
>>I did a check this morning. A 'normal' build doesn't enable the i2c 
>>support as you both noticed. The reason for this is that in 
>>the autoconf 
>>phase of the build the include file linux/i2c-dev.h is not 
>>detected as 
>>valid. I am not sure of the reason but it has to do with the 
>>way it is 
>>validated by autoconf. I edited configure.in to return true 
>>for the i2c 
>>support even in the invalid case. It now builds nicely and 
>>i2c support 
>>is also enabled.
>>Unfortunately doesn't work properly yet. I'll have to look 
>>into it later 
>>today. My guess is, that it has to do with the specification of the 
>>ENABLE, RW, RS control signals. At least the observed behaviour seems 
>>similar to what I had initialy.
>>
>>    
>>
>
>Well, all you will need to do is to create a setup similar to what is
>in the lcd4linux.conf.sample, search for 'WRAP1C'.
>
>Copy that definition, edit where appropriate and it should work.
>
>You'll need to edit the i2c bus, the device address and where do
>the signals go in terms of databus.
>
>However, if your 4 data pins do not correspond to the lower 4 bus bits
>(ie D0 - D3) then the code needs another rewrite, but it is doable.
>
>
>  
>
>>Later today I should have some more time to test.
>>
>>Cheers,
>>
>>Paul
>>
>>    
>>
>
>Tell me your thoughts on this!
>
>Luis Correia
>
>
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