Diogo Martins Silva writes:
> Hello all.
>
> The avr-gcc wiki (https://gcc.gnu.org/wiki/avr-gcc) lists 24 bits
> (u)ints as an extension since version 4.7. How do I use them?
Use __uint24 as the type. Like so
$ cat test.c
volatile __uint24 x;
int main() {
x++;
x--;
}
$ avr-gcc -S test.c -Os
$ cat test.s
.file "test.c"
__SP_H__ = 0x3e
__SP_L__ = 0x3d
__SREG__ = 0x3f
__tmp_reg__ = 0
__zero_reg__ = 1
.section .text.startup,"ax",@progbits
.global main
.type main, @function
main:
/* prologue: function */
/* frame size = 0 */
/* stack size = 0 */
.L__stack_usage = 0
lds r24,x
lds r25,x+1
lds r26,x+2
adiw r24,1
adc r26,__zero_reg__
sts x,r24
sts x+1,r25
sts x+2,r26
lds r24,x
lds r25,x+1
lds r26,x+2
sbiw r24,1
sbc r26,__zero_reg__
sts x,r24
sts x+1,r25
sts x+2,r26
ret
.size main, .-main
.comm x,3,1
.ident "GCC: (AVR_8_bit_GNU_Toolchain_3.5.4_1709) 4.9.2"
.global __do_clear_bss
Regards
Senthil
>
> Thanks
>
> Diogo
>
>
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