> -----Original Message-----
> From:
> [EMAIL PROTECTED]
> Sent: 28 March 2006 12:47
> To: [email protected]
> Subject: [avr-gcc-list] Casting
>
> I am using a <long> as a parameter in which I pass various
> entities, sort of like a mailbox. Mostly they are longs,
> sometimes integers, and sometimes I need to pass a pointer.
> In the latter case a cast to long does not wholly satisfy the
> compiler (3.4.5), due to the size difference on AVRs, thus
> giving the warning:
>
> "cast from pointer to integer of different size"
>
> It is only a warning and the program works fine. However I
> would like to see a clean compile and so have been trying to
> find a combination of casts that would promote a pointer to a
> long, but to no avail. Does anyone have a suggestion?
>
> Ron
Yep.
typedef union
{
long a_long;
int an_int;
void *a_pointer;
} messy_var_t;
typedef struct
{
messy_var_t var;
uint8_t tag; //to indicate what the union (var) contains
} parameter_t;
void fn1 (parameter_t p1)
{
blah.. ;
blah.. ;
blah.. ;
}
I didn't actually compile this but you'll get the idea, I'm sure.
Regards
Nigel Winterbotom
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