NCS 1.7.0 Zephryr how can I the recovery I2C bus is blocked.

[Fb62]

HI,

how can I the recovery I2C bus is blocked.  , SDA line low state?

Thanks 

[Fb62]

Hi 

The nRF52832 is the master, and I have accelerometer, touch and heart rate sensor on the same bus.

I don't know why it hangs but the sda line stays down and I get communication error, red message from the system.

I think it is one of the three sensors that is waiting for the clock.

How do I get a series of pulses out on the SCL line when this happens? Thanks

Fausto

[Kenneth]

If you look at the implementation of nrf_drv_twi_init() you can find there is a:

    if(p_config->clear_bus_init)
    {
        /* Send clocks (max 9) until slave device back from stuck mode */
        twi_clear_bus(p_config);
    }

So I recommend to try to uninit, then init with the clear_bus_init flag set to true.

Kenneth

[Kenneth]

I was not aware you were using ncs, in that case this discussion may be helpful to find a workaround (different chip, but same problem):
https://devzone.nordicsemi.com/f/nordic-q-a/74731/nrf9160-i2c-twi-recovery-and-microsecond-resolution-timer 

[Fb62]

Hi,

Is there an alternative to ncs tools as a development environment?

[Fb62]

How close opened i2c device? in ncs zephyr?

Thanks 

Best Regards

[Kenneth]

Hello,

I have created an internal jira to look into implementing support for the i2c_recover_bus() api. In the meantime I don't have a good solution than to not use the zephyr api, but instead us the nrf_twim api directly. I can see this was also suggested in the linked case.

Kenneth

[Kenneth]

I can confirm this will be supported, but I don't have a timeline yet, likely 1.8 release.

Kenneth