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General i2c question...

 
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SBS



Joined: 15 Aug 2005
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General i2c question...
PostPosted: Tue Sep 27, 2005 9:43 pm     Reply with quote
From what I've read, you can have either a HW i2c or a SW i2c...

Can you have multiple i2c connections to other hardware with one PIC?

My application requires me to connect to an LCD display, AD converter and a Keypad. From what I've read, I can define an i2c protocal with #use i2c(...).

This can be set up to use the hardware i2c or a software (bit banging) i2c.

How can one set up two? One HW one SW?

Thanks,
Sal
kender



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PostPosted: Tue Sep 27, 2005 9:47 pm     Reply with quote
Why would you need two? Can't you hand all of your I2C devices on the same bus (be it h/w or s/w)? Do addresses conflict that badly?
SBS



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PostPosted: Tue Sep 27, 2005 9:57 pm     Reply with quote
DOH! I knew that!

Thank!
asmallri



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PostPosted: Tue Sep 27, 2005 10:40 pm     Reply with quote
kender wrote:
Why would you need two? Can't you hand all of your I2C devices on the same bus (be it h/w or s/w)? Do addresses conflict that badly?


You may want more than one bus if you are dealing with divices that support different bus speeds (such as 100K versus 400K) and you need to talk to one at high speed.
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Mark



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PostPosted: Wed Sep 28, 2005 6:47 am     Reply with quote
Or say that you are talking between PICs with I2C and each PIC has its own external EEPROM.
treitmey



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PostPosted: Wed Sep 28, 2005 8:18 am     Reply with quote
or 5V and 3.3V
and keep like devices together on a bridge
kender



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PostPosted: Fri Oct 07, 2005 5:52 pm     Reply with quote
Mark wrote:
Or say that you are talking between PICs with I2C and each PIC has its own external EEPROM.

That's an interesting one. I wonder if it's possible to do this with just #use i2c(...) and without writing custom I2C bit-banging code?
Joshua Lai



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PostPosted: Fri Oct 07, 2005 9:44 pm     Reply with quote
asmallri wrote:

You may want more than one bus if you are dealing with divices that support different bus speeds (such as 100K versus 400K) and you need to talk to one at high speed.


How to do that? How to specificy i2c speed in #use i2c(...)?

If not specify, what is the default i2c speed?
PCM programmer



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PostPosted: Sun Oct 09, 2005 2:04 pm     Reply with quote
Code:
How to do that? How to specificy i2c speed in #use i2c(...)?

You have an old version of the compiler. Your version (2.734) came
out in February 2001. The closest manual for that version is the
July 2001 manual. You can download it from one of these websites:
http://web.media.mit.edu/~earroyo/voice_chip/CCSC.pdf
http://www.robozes.com/otrosdoc/manualccsc.pdf
Then look in the #use i2c section of the manual to see how to set
the speed.
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