Arduino Gcc and SPI

[FrankRadio]

I think arduino is based on Gcc, so can i write ASM code in the arduino?

I was readin Gcc manuals and i found this:

int foo ()
{
int x = 42;
int *y = &x;
int result;
asm ("magic stuff accessing an 'int' pointed to by '%1'"
"=&d" (r) : "a" (y), "m" (*y));
return result;
}

What i want to do is create a SPI library to use some AtMegas like SPI to UART devices, for that i need create some code in low level, and this must be created to be Master/Slave and Reader/Writer.

So can be done this?, In the Atmel MEga Pdf saids this can be done and in a full-duplex version. So some one try this?

Best Regasds.
Frank

[kg4wsv]

This doesn't answer your question, but you don't have to use assembly to access SPI or I²C. Check the playground for examples - there's at least one (the external EEPROM, IIRC) that gives C code examples of SPI.

-j