[PIC] I2C Multi master problem, help needed

[milan.rajik]

Hi

This is a different project compared to the other two i2C projects of which I asked questions. So, I am posting this in a separate thread.

The earlier two were I2C Master-Slave communication but this is I2C Multi master Communication.

I have a problem. In the project Master-Slave1 is named as master and Master-Slave2 is named as slave.

I am testing in both Proteus and hardware. For hardware I am using two EasyPIC v7 development boards with Saleae Logic Analyzer and on both I am getting the same signals.

So, the problem is in the code. See the image. You can see that

Master-Slave1 is successfully sending data to Master-Slave2 and then
Master-Slave2 is successfully sending data to Master-Slave1

the problem happens after this.

After this, Master-Slave2 to Master-Slave1 communication happens good but Master-Slave1 to Master-Slave2 communication doesn't happen properly. See the question marks in the i2C debugger data.

I think the problem is in setting the I2C lines as outputs for master mode and inputs for slave mode.

broken link removed

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Edit:

My guess was right. I should not configure TRISC as output while acting as master. The

 I2C1_Init(100000);

will take care of the I2C pins tris settings.

Now the I2C Multi-Master project is working fine in both Proteus and hardware.

broken link removed

 

[babatundeawe]

this is great. you have made good work here. just what i needed.

will check it out and give you feedback. hope my questions are welcome?

thanks