Fix CYCLES_PER_MICROSECOND conflict

7 years ago · 451fb16f9b
1 changed files with 3 additions and 1 deletions
--- a/Marlin/src/core/macros.h
+++ b/Marlin/src/core/macros.h
@ -46,7 +46,9 @@
 #define _O3          __attribute__((optimize("O3")))
 // Clock speed factors
-#define CYCLES_PER_MICROSECOND (F_CPU / 1000000L) // 16 or 20 on AVR
+#ifndef CYCLES_PER_MICROSECOND
  #define CYCLES_PER_MICROSECOND (F_CPU / 1000000L) // 16 or 20 on AVR
 #endif
 // Highly granular delays for step pulses, etc.
 #define DELAY_0_NOP NOOP