ok, understood. Thank you !
So the optimized routine would be
do_spirw:
out_ SPDR, tosl
do_spirw1:
in_ temp0, SPSR
sbrs temp0, 7
rjmp do_spirw1 ; wait until complete
in_ tosl, SPDR
ret
Greetings
Rafael
El Viernes 29 de agosto de 2014 19:37, Matthias Trute escribió:
Hi Rafael,
> do_spirw:
> 1.out_ SPDR, tosl
> do_spirw1:
> 2.in_ temp0, SPSR
> 3.cbr temp0,7
> 4.out_ SPSR, temp0
> 5.in_ temp0, SPSR
> 6.sbrs temp0, 7
> 7.rjmp do_spirw1 ; wait until complete
> 8.in_ tosl, SPDR
> 9.ret
>
> In 1) we transmit a byte (and activa
Hi Amforthers,
I was learning a bit about the internals of the SPI driver and finally found
the "core" word c!@spi
I'm comparing side by side the assembler source with the 328P datasheet
(=Arduino) and I can't understand completely the purpose of some of this code,
which I list here for conven
