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What have i overlooked here with my FIQ interrupt ?
Hello, i hope someone can help me.
I am programming on a SAM7S256.
I use GCC4.4.2.
When i compile, i do not get any errors.First some notes to explain :
When the interrupts are disabled my program works fine.
The IRQ handler code is disabled and is not used . I use only the FIQ handler for testing purposes.
When i use the example startup.s with the bulky quantum leaps 2 vector table code in it from olimex , the FIQ interrupt code works as well and perfect. My PIT timer fires every 1 millisecond giving me a led pulsating at 500Hz (2milliseconds). I measure the pulsating led with a frequency counter.
The FIQ interrupt code saves the context of the registers. Branches to the C function System_Int_Handler clears the PIT and toggles a led and returns. After that the registers and the cpsr are restored and the handler gives control back to the program that was running.I had the idea to create an optimized startup.s. because i do not have a need for 32bit addressing space and wanted as much speed as possible. As such i have written the startup code below.
When i disable the FIQ interrupt, the code works fine.
When i enable the FIQ interrupt, i estimate that it hangs right after the first time the PIT fires. ( I am going to test this by setting a large PIT time and will post the result later.)I do not branch to the FIQ handler now, instead i execute it directly from address 0x1C.
Knowing all this, i think that there is not an error in my interrupt code.
I think i have an error in the code copying the ram vectors and the interrupt handlers code from ROM to RAM.
Can anybody point my error out for me ?
I am sure i am overlooking something. But i do not see it.Code:
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