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Re: On ARM7 can one of FIQ/IRQ be used for non-eCos stuff?
On 2008-04-02, Andrew Lunn <andrew@lunn.ch> wrote:
>> I would think what you'd want to do is to provide a function to change
>> the FIQ vector after eCos has started.
>
> It already exists.
>
> void cyg_interrupt_get_vsr(cyg_vector_t vector, cyg_VSR_t** vsr);
>
> void cyg_interrupt_set_vsr(cyg_vector_t vector, cyg_VSR_t* vsr);
>
> with the vector CYGNUM_HAL_VECTOR_FIQ.
That would work. It would save a few clock cycles to set the
vector in the actual vector table rather than in the secondary
indirect one, but I don't know if it's worth the extra hassle.
> The vsr function needs to be written in assembly and save and restore
> all registers etc.
Yup.
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