How to differentiate between two slave devices connected over same TWI bus.

[beemavishnu]

Hello,

I am using nRF52832 DK PCA10040 v1.2.4, SDK_15.3.0, S132 SoftDevice and Segger for flashing the image. I am using ‘ble_app_blinky’.

Currently with one device connected over TWI is working fine. But I am going to have one more device on same TWI bus.

So how to differentiate two devices on same TWI bus. I know about TWI, but trying to understand with respect to call back functions as it will be only one for each TWI bus.

Are there any events with slave address or do I need to set a flag to differentiate at application level ?

Thanks & Regards

Vishnu Beema

[awneil]

The Slave Address is what distinguishes devices on the bus.

beemavishnu said:

do I need to set a flag to differentiate at application level

You can only ever have one transaction in progress at any one time on any one I2C bus - so, when you start the transaction, you need to "remember" which Slave you addressed ...

Or look at the TWI Transaction Manager:

https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.3.0/lib_nrf_twi_mngr.html

[beemavishnu]

Thank you for your inputs.