[En-Nut-Discussion] I2C questions

[Kowalsky, Richard]

Hello Mr. Basser,

    Thank your for your code example.  With the help of Andreas Genzel,
I was able to get my code working.  Along with the MAX5821's and
DS3803's, I have a Dallas DS33231 Real Time Clock.  (Unfortunately that
part is still on back-order), when it arrives, your code example will
help me get that running also.

Again, thanks for your help,

Richard

-----Original Message-----
From: en-nut-discussion-bounces at egnite.de
[mailto:en-nut-discussion-bounces at egnite.de] On Behalf Of William Basser
Sent: Sunday, January 01, 2006 10:38 AM
To: 'Ethernut User Chat (English)'
Subject: RE: [En-Nut-Discussion] I2C questions

I have attached a driver for a Dallas DS1340 RTC 

-----Original Message-----
From: en-nut-discussion-bounces at egnite.de
[mailto:en-nut-discussion-bounces at egnite.de] On Behalf Of Kowalsky,
Richard
Sent: Saturday, December 31, 2005 12:24 PM
To: en-nut-discussion at egnite.de
Subject: [En-Nut-Discussion] I2C questions

Hello All,

    I have a custom Mega128 based board and am using Enut 3.9.8. My
board has 2 - Max5821 I2C DAC's and 2 - Dallas DS1803 Digital
Potentiometers.  I have read the data sheets and the 128 manual but
still have some questions. I am trying to control them but have not had
any success yet.  The Mega128 will be the master.    If anyone can help,
I would really appreciate it.

    I know I need to call TwInit(addr) first to initialize the I2C bus,
but I am confused about the <addr> argument.  Can I just use any unused
address value?

    Next, I think I need to call TwIOCtl() to set the bus speed, but I
noticed that TwInit() already calls TwIOCtl() once so I am not sure if
this is really necessary.  If I do call TwIOCtl() and I want to run the
I2C buss at 100Khz, do I just literally pass 100,000 as the argument?

    Lastly, once I call TwInit() and TwIOCtl(), is that it?  From then
on, I just call TwMasterTransact() as needed?

    Sorry for the many questions, I think I am close but must be missing
one thing here or there.

    If anyone is willing to share any sample code, I would appreciate it
very much, if not, no problem.

Thanks in advance,
Richard



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