> -----Original Message----- > From: > avr-gcc-list-bounces+eweddington=cso.atmel....@nongnu.org > [mailto:avr-gcc-list-bounces+eweddington=cso.atmel....@nongnu. > org] On Behalf Of Vincent Trouilliez > Sent: Thursday, February 19, 2009 11:02 AM > To: avr-gcc-list@nongnu.org > Subject: [avr-gcc-list] How to force GCC to not to remove > "nop" statements ? > > Hi list, > > Like many people I guess, I am using in-lined "nop" asm statements to > respect the timing of external devices, when toggling their control > lines. > <snip> > Am using avr-gcc 4.3.2 >
If you are using WinAVR 20081205 then you can use one of the new builtin functions: void __builtin_avr_delay_cycles(unsigned long __n); The prototype can be found in <avr/builtins.h>, but you shouldn't need the prototype to call it. The parameter is expecting the number of cycles that you want to delay, so in your case this should be: __builtin_avr_delay_cycles(4); And then let gcc handle generating the code for you. ;-) Eric Weddington _______________________________________________ AVR-GCC-list mailing list AVR-GCC-list@nongnu.org http://lists.nongnu.org/mailman/listinfo/avr-gcc-list
