@Tharun123 wrote:
Hi everyone, I am trying to learn i2c communication between two stm32 microcontrollers..
I would suggest that's not a great way to learn!
That means you have to implement both the slave and the master on the two separate MCUs.
The trouble is that, when you get problems, you then don't know:
- Is the problem in the Master?
- Is the problem in the Slave?
- Are there problems in both Master and Slave?
A far better approach is to start with just one end of the link, and use a well-known, standard device at the other end to test against.
As by far the commonest (therefore, best supported) use case is to have the microcontroller as the Master, I would suggest that you start there.
Something like this provides some good test devices for your Master implementation:
https://www.microchip.com/en-us/development-tool/pkserial-i2c1
In developing your master, be sure to test it under common fault conditions; eg,
- Missing slave device
- One wire disconnected
- Pullups missing
Get to understand how it behaves in such conditions.
Understand what good and bad signals look like on an oscilloscope.
Provide good diagnostics to give visibility of what's happening.
Then, once you have your master working well, you can start to develop a Slave to work with it.
I2C References:
The I2C-bus Specification and User Manual: https://www.nxp.com/docs/en/user-guide/UM10204.pdf
https://en.wikipedia.org/wiki/I%C2%B2C
https://www.i2c-bus.org/
https://learn.sparkfun.com/tutorials/i2c/all
#BothEnds
