Error: L6218E: Undefined symbol twi_clear_bus

[clockis]

I have recently updated the SDK for my application from version 13.0.0 to 17.1.0, everything seems to be in order except for this function in nrf_drv_twi.c called twi_clear_bus() which no matter what I do keeps giving the error undefined (Error: L6218E: Undefined symbol twi_clear_bus).

I have tried declaring it in several different ways but none of it works. I even declared it in the nrf_drv_twi.h & nrf_drv_twi.c and also my upper level libraries that use these files but it stills gives the same error. 

I have also searched the whole SDK for a declaration of this function so I could include the appropriate file but found nothing.

Any suggestions would be greatly appreciated. Thank you!

[clockis]

Please close this ticket as I have found the problem, the function twi_clear_bus() was called by my library outside of nrf_drv_twi.c and that was the issue. Thank you for your time.

[Vidar Berg]

Hello,

twi_clear_bus() is defined in nrf_drv_twi.c, but as an internal function. That is, it can't be called from outside the driver.

To use it, you have to pass .clear_bus_init=true to your nrf_drv_twi_init() function.

Best regards,

Vidar