Forum: ARM programming with GCC/GNU tools EP93xx FREE-RTOS and VIC interrupts

von Thomas M. (thames)

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EP93xx FREE-RTOS and VIC interrupts

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?


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