Hi
Now I know why was not the AL interrupt detected.
The timing of the two AM3352s generating "Start Condition" was not simultaneously.
When the "AM3352 A" generate "Start Condition"(I2C_IRQENABLE_SET.STT=1), the "AM3352 B" has generated the "Start Condition already, so the "AM3352 A" could not generate it successfully, and the I2C_IRQENABLE_SET.STT does not become "0".
Now my Question is that in this situation, what should be do? Should I reset the I2C module?
I can not find any description about the step when the I2C_IRQENABLE_SET.STT does not become "0".
Thanks!
Yin