How to manage simultaneous I²C and RF data transfers ?

[eyals111]

Posted on May 26, 2014 at 23:23

What is the recommended way to mange simultaneous I�C and RF data transfers with M24SR IC and 2 Host MCU & NFC Phone?

I have implemented mechanism with time Slice , so that each Host has time window to communicate with the M24SR , but still have some issues to resolve , such as the size of Time Slice , number of retry etc. if anyone has better idea i will appreciate very much .  #m24sr #session #rf #rf-session #gpo #i2c #i2c #m24sr

[Anais GALLIGANI]

Posted on June 02, 2014 at 11:59 Hello ,

M24SR was built around the session mechanism which can affect the communication to one or other protocol .

On top of that I2C has super user priority and  can cancel RF session if necessary  .

In conclusion best way to manage M24SR is to use the session mechanism .

I hope this is helping you, Best Regards, Have a nice day, ST NFC/RFID dynamic tag e2e support

[eyals111]

Posted on June 09, 2014 at 19:34

Thanks for the Quick Reply , few open issue :

1.If using I2C super user , it can kill ongoing RF Session this can lead to data corruption 2.the Session mechanism force the M24SR to give the attention to the first Host that            request to open session , it doesnt deal with multiple Host .What i am asking for,  how to manage two Host Communicating with M24SR Periodically ?

[Anais GALLIGANI · Accepted solution]

Posted on June 10, 2014 at 15:38

Hello ,

1)

Priority management will wait completion of RF command before shutting RF session  and open I2C  session .

2)

 M24SR could only have two host families , one RF and one I2C and  management is performed between RF and I2C .

Playing with GPO in session mode you can imagine to have several I2C host  addressing the same M24SR

I hope this is helping you,Best regards,ST dynamic NFC/RFID tags e2e support