I posted this question over on the Legato forums several weeks ago to no avail - see link at bottom.
Perhaps someone on the more hardware-oriented mangOH forum is able to assist me?
Basically, I need the modem to react (by resuming from suspend mode) on an edge-triggered GPIO interrupt on GPIO21. This should be possible according to my interpretation the WP8548 Product Technical Specification. However, this only works if the system hasn’t already suspended. My system must remain suspended for power conservation but also maintain registration on a cellular network.
I have verified that the system resumes from suspend mode on logic level transitions on pin UIM1_DET and UIM2_DET. Presumably the modem’s firmware is handling this.
Besides configuring the GPIO edge sense and providing a change event callback handler, do I need to do anything else to get this working?