MSP432E401Y: I2C Bus Collision for Slave Device

Akash Patel

Part Number: MSP432E401Y

Hi team,

We are looking at the Arbitration Lost bit (ARBLST) in the I2CMCS register. Does arbitration lost apply for a slave device? If not, how do we detect a bus collision for a slave device?

Regards,

Akash

over 7 years ago

0 Bob Landers over 7 years ago

TI__Expert 8510 points

The aribtration lost applies only to masters, since only they arbitrate**. The slave devices only respond if a master has addressed them, and only a single master will win arbitration. So, no slave arbitration is needed in standard I2C.

**An exception to this does occur if using SMBUS, since it uses slave aribtration to set up slave addressing. This feature is not supported in the MSP432 hardware, but can be implemented via software. See this MSP430 post for an example of others who did this.

-Bob L.

0 Akash Patel over 7 years ago in reply to Bob Landers

TI__Expert 6245 points

Hi Bob,

Thank you for the response. This is indeed for an SMBus application. I reviewed the referenced MSP430 post but I did not see any example of how this was done. Can you elaborate more on that? Do we have any examples of this being done on the MSP432E4?

Regards,
Akash