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I don't grasp I2C_isr_state()

 
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rikotech8



Joined: 10 Dec 2011
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I don't grasp I2C_isr_state()
PostPosted: Mon Mar 18, 2013 1:28 pm     Reply with quote
Hello fellows!
I'm about to develop I2C slave code on my 16F873A. So, as I can see by the example code is that I need interrupt routine and utilizing I2C_isr_state(). As I read from CCS Manual the returned value increases with each sent or received byte trough I2C bus.
My question is:
If I2C_isr_state() start value is 0, and if I can write only if the value is bigger than 0x80 then, do I need to read 128 bytes before I be able to write? I mean
it's needed to increase the value of I2C_isr_state() 0x80 times before enable I2C_write() according to
Quote:
The return value increments with each byte received or sent
.
Another question is: is I2C_isr_state() value somehow connected to the value of first received byte, and R/W bit determines the value of I2C_isr_state()?
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Mike Walne



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PostPosted: Mon Mar 18, 2013 2:38 pm     Reply with quote
Some of the grammar in the manual is confusing.

Why not have a play with the provided examples, to see how they work?

Mike
rikotech8



Joined: 10 Dec 2011
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Location: Sofiq,Bulgariq

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PostPosted: Tue Mar 19, 2013 9:44 am     Reply with quote
I'll try to see what happen.
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PCM programmer



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PostPosted: Tue Mar 19, 2013 8:04 pm     Reply with quote
Also, Ttelmah as several threads where he explains the details.
Go to the forum search page:
http://www.ccsinfo.com/forum/search.php
Set the top search box to: i2c_isr_state
Set the bottom box to: Ttelmah
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