Synth-DIY Yahoo! Groups Archives

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A Question About I2C and SMBUS

2005-02-19 by Daniel Adolfsson

Hi, I have been a member of this group for a while now, I cant remember 
if I have ever written anything before though. But hers my question:
I recently purchased a EPIA M1000 (a micro itx board with a 1 GHz 
processor) this board has some really useful interfaces but the one that 
caught my eye was the I2C/SMBUS. I googled for a while and found a guy 
that connected PIC's to the bus and let them run as slaves. But what I 
am wondering is if i can use a AVR to access internal slaves of the 
board for example the temperature sensors. I Would appreciate any links 
to information about the I2C / SMBUS and the avr.

Daniel Adolfsson

RE: [AVR-Chat] A Question About I2C and SMBUS

2005-02-19 by wbounce

What AVR? 
www.AVRFreaks.net as examples of I2C or it is also referred to TWI (two
wire interface) 
For winavr and a atmega128 there are some examples at Brian Dean's
website 
http://www.bdmicro.com/code/ 

There is a i2cScan, srf08, cmp03  all have I2c code in them.

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-----Original Message-----
From: Daniel Adolfsson [mailto:da@glocalnet.net] 
Sent: Saturday, February 19, 2005 9:12 AM
To: AVR-Chat@yahoogroups.com
Subject: [AVR-Chat] A Question About I2C and SMBUS

Hi, I have been a member of this group for a while now, I cant remember 
if I have ever written anything before though. But hers my question: I
recently purchased a EPIA M1000 (a micro itx board with a 1 GHz 
processor) this board has some really useful interfaces but the one that

caught my eye was the I2C/SMBUS. I googled for a while and found a guy 
that connected PIC's to the bus and let them run as slaves. But what I 
am wondering is if i can use a AVR to access internal slaves of the 
board for example the temperature sensors. I Would appreciate any links 
to information about the I2C / SMBUS and the avr.

Daniel Adolfsson

Yahoo! Groups Links

Re: [AVR-Chat] A Question About I2C and SMBUS

2005-02-19 by Daniel Adolfsson

Tanks for the reply
I realy haven't decided on which avr, probably one of those with 
internal 8Mhz operation, I will look in to the links you sent later. Is 
the smbus system designed so that multiple masters can exist on the same 
bus? i don't want to damage my southbridge.

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>What AVR? 
>www.AVRFreaks.net as examples of I2C or it is also referred to TWI (two
>wire interface) 
>For winavr and a atmega128 there are some examples at Brian Dean's
>website 
>http://www.bdmicro.com/code/ 
>
>There is a i2cScan, srf08, cmp03  all have I2c code in them.
>
>
>-----Original Message-----
>From: Daniel Adolfsson [mailto:da@glocalnet.net] 
>Sent: Saturday, February 19, 2005 9:12 AM
>To: AVR-Chat@yahoogroups.com
>Subject: [AVR-Chat] A Question About I2C and SMBUS
>
>
>
>Hi, I have been a member of this group for a while now, I cant remember 
>if I have ever written anything before though. But hers my question: I
>recently purchased a EPIA M1000 (a micro itx board with a 1 GHz 
>processor) this board has some really useful interfaces but the one that
>
>caught my eye was the I2C/SMBUS. I googled for a while and found a guy 
>that connected PIC's to the bus and let them run as slaves. But what I 
>am wondering is if i can use a AVR to access internal slaves of the 
>board for example the temperature sensors. I Would appreciate any links 
>to information about the I2C / SMBUS and the avr.
>
>Daniel Adolfsson
>
>
>
>
> 
>Yahoo! Groups Link
>  
>