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I2C_read() problem

 
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jack
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I2C_read() problem
PostPosted: Mon May 08, 2006 8:40 am     Reply with quote
I2C PROBLEM
I am facing a few problems regarding I2C, please help me.

I have already defined,
#use I2C(slave,sda=PIN_C4,scl=PIN_C3,address = 0x01,FORCE_HW), why do the compiler still say i2c_isr_state as an Undefined identifier??

when I use i2c_read() in #INT_SSP, why does the program keeps looping at this statement?

Thank you.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Mon May 08, 2006 11:41 am     Reply with quote
Quote:
Why do the compiler still say i2c_isr_state as an Undefined identifier ?

Maybe your version of the compiler doesn't support that version.
Here is the notice from the CCS versions page of when it was added:
3.231 New function added: I2C_ISR_STATE()

See this post for a work-around:
http://www.ccsinfo.com/forum/viewtopic.php?t=26477&start=3
rnielsen



Joined: 23 Sep 2003
Posts: 852
Location: Utah

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PostPosted: Tue May 09, 2006 11:27 am     Reply with quote
Quote:
address = 0x01


The Slave address needs to be an Even number. The LSB is used to determine if the Master is Reading from or Writing to the Slave. You might want to look at the I2C standards publication to see what addresses are valid to use. Granted, any address could be used if you're just doing your own thing but if you ever want to add other I2C devices on the bus you will want to stick to what is valid.

Ronald
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