> -----Original Message----- > From: Bill Perry [mailto:invalid.nore...@gnu.org] > Sent: Monday, August 17, 2009 3:41 PM > To: Joerg Wunsch; Bill Perry; Weddington, Eric; > avr-libc-dev@nongnu.org > Subject: [bug #17216] change to the ../util/delay.h header > for increased functionality > > > Follow-up Comment #3, bug #17216 (project avr-libc): > > Is is possible to move this forward? > > The existing delay macros/functions do have problems. >
Hi Bill, There is a patch to the GCC toolchain, which has been included in the last two releases of WinAVR, that provides new builtin functions, including a function that will delay a specified number of cycles: extern void __builtin_avr_delay_cycles(unsigned long __n); The parameter to this function is an unsigned long which is an unsigned 32-bit number of cycles to delay. When you use this function in your application, GCC will replace the function with "do-nothing" assembly code that will delay the specified number of cycles. This function has not been widely advertised, but it should work for you. Perhaps this will help you in your search for a better delay. Eric Weddington _______________________________________________ AVR-libc-dev mailing list AVR-libc-dev@nongnu.org http://lists.nongnu.org/mailman/listinfo/avr-libc-dev
