Dear list,
How do I do this:
main.c
=============================================
void foo(void) {
}
char table[2] = {
(foo),
(foo),
};
int main(int argc, char* argv[])
{
int adr = table[argc]+0x3F00;
((void (*) (void))adr)();
return 0;
}=============================================
It gives:
main.c:5: warning: initialization makes integer from pointer without a cast
main.c:5: error: initializer element is not computable at load time
main.c:5: error: (near initialization for 'table[0]')
main.c:6: warning: initialization makes integer from pointer without a cast
main.c:6: error: initializer element is not computable at load time
main.c:6: error: (near initialization for 'table[1]')
Why is it not computable? Why is it when I make it 16 bits?
I first wanted to implement this in assembler.
But I got all sorts off error, mainly gas refusing to see I only want 8
bits, not 16.
So I figured I go and try this in C, but I can't get it done.
You might wonder why on earth would I want to such a strange thing?
Well I have a very small bootloader so I know all my functions are within
the 512byte/256 word boundary. And I there for I have no need to store the
full 16-bit address (in order to keep my bootloader small).
I just need the low byte of the address.
How do I do such a thing? Using the lower 8 bits is possible when loading a
register so why not in a table?
In assembler I tried this:
.byte lo8(foo)
.byte pm_lo8(foo)
.byte lo8(pm(foo))
But all are with the same result:
Error: illegal relocation size: 1
Error: junk at end of line, first unrecognized character is `('
Hope you can help
Wouter
_______________________________________________
AVR-GCC-list mailing list
[email protected]
http://lists.nongnu.org/mailman/listinfo/avr-gcc-list
