Re: [Sdcc-user] PCF8574 16*4 LCD - 4bit mode

[Jean-Paul <tch...@fr...>]

Hi,

You have to look at the reference on your physical part and use the =20
corresponding address.
It won't work otherwise.

Did you have a look at:

The SDCC Open Knowledge Resource
http://sdccokr.dl9sec.de/
You'll find just about all you need: I2C routines, 4-bit mode lcd, 8574 .=
..

Jean-Paul


On Thu, 1 Sep 2005 04:23:27 -0700 (PDT), Vikram Tamboli =20
<vik...@ya...> wrote:

>
> hi
>
> Yea I know that so I had already tried with both
> addreses but of no use.
>
>
>
> vikram
>
>
>
> --- Jean-Paul <tch...@fr...> wrote:
>
>> Hi,
>>
>>
>> PCF8574 come in two flavors with two different fixed
>> addresses
>>
>> PCF85474 =3D 0 1 0 0 A2 A1 A0 RW =3D 0x40
>> PCF8574A =3D 0 1 1 1 A2 A1 A0 RW =3D 0x70
>>
>> It looks like you are using a PCF8574
>> with the address of a PCF85474_A_
>> and pins A2=3D0 A1=3D1 A0=3D1
>>
>> Check and try again
>>
>>
>> On Tue, 30 Aug 2005 10:57:35 -0700 (PDT), Vikram
>> Tamboli
>> <vik...@ya...> wrote:
>>
>> > Hi
>> >
>> > Actually I am trying to interface an 16*4 LCD to
>> > AT89c51 using Pcf8574-I2C-io chip.
>> >
>
>
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