What is the recommended way to shutdown a TWI slave and then restart with a secondary I2C slave address

[Kendal Lacey]

On powering up the nRF52840 I start the twis slave.  The nRF52840 works as expected.

I install one i2c slave address on the system, external master has no issues communicating

Problem:  I would like to install and configure a secondary I2C address (SDK 15.1), currently doing the following:

1. nrf_drv_twis_disable(&m_twis)
2. nrf_drv_twis_uninit(&m_twis)
3. load the nrf_drv_twis_config_t with the operational parameters plus the secondary I2C address
4. nrf_drv_twis_init(&m_twis, &config, handler_function)
5. nrf_drv_twis_enable(&m_twis)

If I execute this code from within a debugger, Segger Studios, it works perfectly.  Master can communicate on both addresses

If I load a release image onto the nRF52840 it works sometimes but it is not reliable.

Any ideas would be appreciated, 

Regards.

[Nguyen Hoan Hoang]

try disabling RTT to see what happen.

[Kendal Lacey]

Disabled same results.  I2C master reports failure during the address probe NAK returned.

[Nguyen Hoan Hoang]

seems like slave is not responding.  Do you get the interrupt on the slave ?

[Kendal Lacey]

I get the interrupt when I am in Segger Studio.  Everything works great.

It is when I am running the release version that the secondary i2c address does not work.

[Nguyen Hoan Hoang]

Most of the time the issue with debug & release build is related to debug logging.  Check if you have any code inside a log function or rat function or assert.  Verify also if possible the the actual slave address was written to the register.