USB IRQ integration #613
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USB IRQ integration #613
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this all seems to work as expected now, next up: hooking the interrupt handler for the IOX. Probably should put the actual IRQ router in the HAL so that multiple services can configure it, but have the handler actually invoke a function in our address space.
the Iox block can register up to 8 interrupts on any of the GPIO pins on the device. All the interrupts get OR'd together to generate a single interrupt to the CPU, which has to be disambiguated and forwarded on to the registering server as an event. Due to the protection model of Xous, the configuration of the IRQ has to be centralized, and the handling is done with a message. This means that the actual time from the interrupt to the handling can be a bit variable, up to several ms, so this method isn't suitable for hard real time. For hard real time stuff, see the implementation in the USB stack for Cramium, which has a very timing sensitive IRQ handler requirement.
CGU has some additional dividers to help with ATPG and other things.
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This is for handling plug in/plug out detection and robustifying the stack against those conditions.
WIP for now, mostly just to help resolve merge conflicts as we've got a couple changes in flight in parallel.