I have a macro defined:
#define WRITE_4BYTES(x, y) { CS_LOW \
*(BASE + ((y) ))) = (INT8U) (x); \
*(BASE + ((y + 1)))) = (INT8U) (x >> 8);\
CS_HIGH }
(where BASE is defined as an 8 bit pointer with a value 0x8000 in ext
ram and the macros CS_LOW and CS_HIGH are predefined to set a pin lo /
high).
When assembled by avr-gcc (GCC) 3.4.5, avr-libc-1.4.2, binutils-2.16.1, I
get the following (for the atmega128):
42f2: 31 83 std Z+1, r19 ; 0x01
42f4: 20 83 st Z, r18
which means that in reality the write occurs this way:
*(BASE + ((y + 1)))) = (INT8U) (x >> 8);\
*(BASE + ((y) ))) = (INT8U) (x); \
Is there any way I can "force" the write order to be in the order I
specified (in C), or must I resort to assembly? Thanks.
Keith
_______________________________________________
AVR-chat mailing list
[email protected]
http://lists.nongnu.org/mailman/listinfo/avr-chat
