TWI recover from timeout

[AmiguelS]

I am using the TWI module in master mode, with sdk 10. I purposely create an error situation, in which the TWI gets stuck and keeps returning NRF_ERROR_BUSY every time I try to initiate a transfer. How may the device recover from this block? I have tried uninit/init the TWI module, with no success.

[Ole Bauck]

Problem is that a busy flag in an internal structure is not set to false when initializing the driver. This has been fixed in SDK 11. Either update to SDK 11 or add this line to nrf_drv_twi_init(..):

m_cb[p_instance->instance_id].transfer_in_progress = false;

[AmiguelS]

Once the error is introduced (pull SDA/SCL to GND) and detected, the TWI module is re-initialized (including the above mentioned flag clear) and the following happens:

• nrf_drv_twi_tx()/nrf_drv_twi_rx() returns NRF_SUCCESS
• However, SDA/SCL lines have no transitions, they are completely still
• nrf_drv_twi_int_handler() is never called again

Porting to SDK11 is not an option as I need the functionalities offered specifically by SDK10 (S110)