[sdiy] help...no make8() function in Arduino...converting PIC to AVR

[Martin Klang]

what do they do on the pic?

make8 I found in the PIC C Compiler Reference:
i8 = MAKE8(var, offset)
Same as: i8 = (((var >> (offset*8)) & 0xff)

so that
> tmpbyte1 = make8(tmp1, 1);

would be
tmpbyte1 = (tmp1 >> 8) & 0xff;

and _mul() multiplies, right?

Looks like the code is specifically optimised for the pic instructions set -
tmp1 is 16 bit, right? acc1 and val1 8-bit unsigned integers?

Presumably you can replace the two lines with 
uint8_t value = (uint8_t)( acc1*val1>>8);
depending on data types, but would have to see some more code to know.


hth,

/m

On 11 Apr 2012, at 16:25, dan snazelle wrote:

> can someone help me ?
> 
> i am trying to convert some PIC code to AVR
> 
> it is going fine except for 2 things
> 
> there is no make8() function and there is no _mul()
> 
> 
> so code lines like this:
> 
> 
> tmp1 = _mul (acc1, val1);
> 
>  tmpbyte1 = make8(tmp1, 1);
> 
> 
> do not work
> 
> 
> 
> i have been looking for the make8 function online so i can just write that function into my code but no luck
> 
> 
> thanks for any help!