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EP93xx FREE-RTOS and VIC interrupts

Posted by tom messum on October 1, 2010

Anybody know of a freeRTOS implementation for the Cirrus EP93xx chip?

I am trying to keep the basic set of interrupt functions used in the original ARM port used for other devices.

This requires a direct vectored jump to a program memory location held in the VIC address register when an IRQ arives. In many ARMs this is simply done by including a "ldr pc,[PC,#-0xFF0]" in the IRQ entry of the vector interrupt table (at RAM zero). But for some reason the EP93xx doesn't seem to implement this, at least it doesn't work here :-(

Is there a way around it? (without modifying the RTOS code) i.e. how can I implement a jump to the contents of the VIC1 vector register (at 0x800B0030) without using any other CPU registers, or saving anything on the stack?

RE: EP93xx FREE-RTOS and VIC interrupts

Posted by Dave on October 1, 2010
Sorry, never heard of an EP93xx. Could just just jump to a common interrupt entry point that inspects the necessary VIC registers to see where to jump to next?

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