TWI blocking mode sometimes blocked in twi_transfer.

[cgha]

I'm using SDK 12.3.0 and nrf51822. In twi_transfer function it always return true. Maybe the bus is hanged?

[cgha]

Now find the issue, the I2C bus is stuck by one of my I2C slave module, after remove the module, now seems OK, may be the i2c resistor on the module and on my demo board be in parallel connection and cause this problem. 

[Martin Lesund]

Thank you for clearing that up.

I am glad you found the solution.