Re: [avr-libc-dev] [bug #54652] Missing support for ATmega328PB

[Paulo Marques]

Hi all,

I had to support the ATmega328PB in a personal project, and did with a 
hack. I'm posting it here in case it helps anyone. I just created a 
"hack.S" file with:

        .macro  vector name
        .weak   \name
        .set    \name, __my_bad_interrupt
        jmp     \name
        .endm

        .section .vectors,"ax",@progbits

        .global __extra_vectors
        .func   __extra_vectors
__extra_vectors:
        vector  __vector_26
        vector  __vector_27
        vector  __vector_28
        vector  __vector_29
        vector  __vector_30
        vector  __vector_31
        vector  __vector_32
        vector  __vector_33
        vector  __vector_34
        vector  __vector_35
        vector  __vector_36
        vector  __vector_37
        vector  __vector_38
        vector  __vector_39
        vector  __vector_40
        vector  __vector_41
        vector  __vector_42
        vector  __vector_43
        vector  __vector_44
        vector  __vector_45
        .endfunc

        .text
        .global __my_bad_interrupt
        .func   __my_bad_interrupt
__my_bad_interrupt:
        jmp __bad_interrupt
        .endfunc

Then to use the serial port 1 RX interrupt (for instance), just write on 
the C code:

// serial port 1 rx data available
ISR(_VECTOR(28))
{
  //.... code goes here
}

and I just compile as if it were 328P.

It is certainly a ugly hack, but it stays limited to your project, 
without having to make changes to the toolchain.

Regards,

On 05/06/19 16:49, Paul Evans wrote:
> Follow-up Comment #2, bug #54652 (project avr-libc):
>
> Any update on this? I'm keen to not have to regularly make that 2-line edit to
> my "io.h" file every time the debian package gets updated.
>
> Is there a process by which this can make its way into a release?
>
>      _______________________________________________________
>
> Reply to this item at:
>
>    <https://savannah.nongnu.org/bugs/?54652>
>
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--
Paulo Marques - www.grupopie.com

"To know recursion, you must first know recursion."