Yes, the interrupt attribute causes the function to be named __isr_X where
X is the word offset of the interrupt from the vector table start (viz.,
the value of the attribute's parameter divided by two). Those symbols are
used to initialize the vector table in crt0ivtbl.o.
Thus, if you're using the MSP430F5438A where USCI_A1_VECTOR is 0x5C
(decimal 92), the corresponding interrupt vector to be installed will be
__isr_46.
Due to design decisions in the distant past there's no way to use the
constants from the MCU header to automatically create the corresponding
interrupt name in an assembly file. But you can easily use -S on a C
source file that contains an interrupt routine to see what the assembly
source needs to look like.
Peter
On Wed, Dec 11, 2013 at 4:03 PM, Wayne Uroda <w.ur...@gmail.com> wrote:
> Even though I think it is sorted now, I still wonder (for my own knowledge
> and completeness) if there is a way to either override just one of the
> vector positions (or is there a magic name that given to the function
> accomplishes the same thing) or is there a way to override all of the
> vector table?
>
> I did it with the aid of nostartfiles many years ago (had need to write my
> own boot loader anyway) but I wonder if there is a way to do it without
> losing the startup routines.
>
> - Wayne
>
>
>
> On 11/12/2013, at 22:23, Peter Bigot <big...@acm.org> wrote:
>
> See https://github.com/pabigot/freertos-mspgcc for FreeRTOS using MSPGCC
> as of mid 2012. The use of naked is in Source/portable/GCC/MSP430, but
> does not apply to the timer ISR itself. It was not necessary to use
> external assembly sources.
>
> http://pabigot.github.io/bsp430/freertos_8h.html may also be useful.
>
> As I recall I did have FreeRTOS working under BSP430 and so supporting all
> MCUs in the product line. The freertos-bsp430 repository was intended to
> supersede freertos-mspgcc; at this point there is no public difference,
> though I seem to have some pending updates in my local workspace. None of
> that is actively supported but it could be if people find it useful.
>
> Peter
>
> On Tue, Dec 10, 2013 at 9:48 PM, Wayne Uroda <w.ur...@gmail.com> wrote:
>
>> Hello,
>>
>> I am trying to port FreeRTOS to the MSP430F5519.
>>
>> In order to write the context switching part, I need to write a timer
>> interrupt service routine in pure assembly (the compiler right now is
>> doing
>> some extra push before I can do anything in the ISR, even with nothing in
>> the body...)
>>
>> How can I place a function (defined in an assembly file) into the vector
>> table?
>>
>> Thanks,
>>
>> - Wayne
>>
>>
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