I'm curious to hear more how/why you use FIQ? From googling it looks like it's an ARM feature. How can/does that work with a general purpose OS or are you using bare metal ARM?
We've got our own internal RTOS, not a general purpose OS.
We use it for different things depending on the board, but my favorite is a really sweet profiler that's integrated with our watchdog logic that'll give us ~1000 PC+SP samples in the 100msec or so before our watchdog timer resets our board. That's pretty invaluable for debugging.
We use it for different things depending on the board, but my favorite is a really sweet profiler that's integrated with our watchdog logic that'll give us ~1000 PC+SP samples in the 100msec or so before our watchdog timer resets our board. That's pretty invaluable for debugging.