I wish there was a better way to interrupt handlers in classes, for
embedded. For example I write a UART class as a driver which I
initialize by passing a pointer to hardware address. However because
different UARTs use different interrupt vectors I end up having to have the
extern C and create each handler which then I have to register a callback
for the handler to call the correct method in class instance.
If you guys have a better way I would love to know.
Thanks
Trampas
On Sat, Apr 10, 2021 at 11:26 AM Jonathan Wakely <jwakely.gcc@xxxxxxxxx>
wrote:
>
>
> On Sat, 10 Apr 2021, 15:07 Klaus Rudolph via Gcc-help, <
> gcc-help@xxxxxxxxxxx> wrote:
>
>> Hi all,
>>
>> if I write a class with static member function I can use it as an
>> interrupt handler as follows:
>>
>> class Dummy
>> {
>> static void Handler() __asm__("__vector_10")
>> __attribute__((__signal__, __used__, __externally_visible__));
>> };
>>
>> void Dummy::Handler()
>> {
>>
>> }
>>
>> I can see the vector is entered in the handler table:
>>
>>
>>
>> 1c: 0c 94 34 00 jmp 0x68 ; 0x68 <__bad_interrupt>
>> 20: 0c 94 34 00 jmp 0x68 ; 0x68 <__bad_interrupt>
>> 24: 0c 94 34 00 jmp 0x68 ; 0x68 <__bad_interrupt>
>> 28: 0c 94 36 00 jmp 0x6c ; 0x6c <__vector_10>
>> 2c: 0c 94 34 00 jmp 0x68 ; 0x68 <__bad_interrupt>
>> 30: 0c 94 34 00 jmp 0x68 ; 0x68 <__bad_interrupt>
>>
>> ###################
>>
>> But if the class becomes a template, the function is not longer entered
>> in the handler. How can I fix it?
>>
>> template < int i >
>> class Dummy
>> {
>> static void Handler() __asm__("__vector_10")
>> __attribute__((__signal__, __used__, __externally_visible__));
>> };
>>
>> template < int i>
>> void Dummy<i>::Handler()
>> {
>>
>> }
>>
>> Dummy<1> d1;
>>
>
> This doesn't cause the instantiation of the member function.
>
> Have you tried an explicit instantiation?
>
> template class Dummy<1>;
>
>
>
>
