Posted on February 14, 2015 at 12:26My solution was in cpal option CPAL_DEBUG. This mode was cause of long delays in transfer. Hope it will be helpful for someone.

Posted on February 12, 2015 at 14:58Did anybody find solution for this issue? I have the same problem.. During CPAL i2c communication, the SCL line stay low for a significant time (20-30 ms).