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I2C Communication between two PIC18 microcontroller

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pjohn

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Dear All,

I am looking for an example project or tutorial that utilizes C language or Microchip Library to configure two PIC 18 using I2C. Any help or direction will be highly appreciated.

Best Regards
 

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    pjohn

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Thanks very much for your help
 

The example code need the MCC18 compiler library, but I am using the PIC18F45K22, I found that it is not supported by the MCC18 library.....
I will try to #define I2C_V6 in my code to use the "i2c.h" library

Also, in the example code, why it does not need to send stop bit to terminate the communication?


Thanks
 
Last edited:

have you downloaded the latest version of MPLAB and MCC18 ?
**broken link removed**

my version of mcc18 picks up the include OK
Code: 
#include <p18F45K22.h>
 
Last edited:

The required subroutine is not in pic18f45k22.h.
They are in i2c.h and pcconfig.h (in C:\MCC18\h)(I attached here with .txt extension)

In the pcconfig.h, the code is like:
Code: 
#ifdef   __18F65K22
     #define I2C_V6_1
There is no __18F45K22...

and in i2c.h, the code is:
Code: 
#ifdef I2C_V6_1
... 
... //I2C function
...

I tried to add a code in my main.c to use the function in the i2c.h:
Code: 
#include  <i2c.h>
#define I2C_V6

but I get an error message :
main.c:308:Warning [2058] call of function without prototype
Click to expand...
 

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  • i2c.txt
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  • pconfig.txt
    291.5 KB · Views: 61

which function has no prototype?
you can usually ignore the warnings, if the project builds OK try to load and run it
 

I choose to rewrite the function in my project.

Btw, in your example code, why it does not need to send stop bit to terminate the communication?
 

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