I'm using the EVAL-428 board with 246 driver chip. The stallguard profiler shows a steady and repeatable green bar at load of around 4 at the speed I want, except when stalled when it goes all red as expected.
However, when I use the supplied test application, the stall protection stops the motor after a few turns, even when on the least sensitive setting. The red bar does not increase visibily to anywhere near the limit I've set, it stays around half way and yet the motor stops anyway.
Can someone explain why that might be the case, or suggest what I'm doing wrong?