move US_TO_NT_MULTIPLIER macro definition in Makefile

Makefile

@@ -5,6 +5,8 @@
 
 PROJECT_DIR = .
 
+US_TO_NT_MULTIPLIER = 100
+
 # Imported source files and paths
 RUSEFI_LIB = .
 include $(RUSEFI_LIB)/util/util.mk
@@ -57,6 +59,7 @@ ifeq ($(USE_OPT),)
   #USE_OPT = $(RFLAGS) -O2 -fgnu89-inline -ggdb -fomit-frame-pointer -falign-functions=16 -std=gnu99 -Werror-implicit-function-declaration -Werror -Wno-error=pointer-sign -Wno-error=unused-function -Wno-error=unused-variable -Wno-error=sign-compare -Wno-error=unused-parameter -Wno-error=missing-field-initializers
   USE_OPT = -c -Wall -O0 -ggdb -g
   USE_OPT += -Werror=missing-field-initializers -Werror=shadow
+  USE_OPT += -D US_TO_NT_MULTIPLIER=$(US_TO_NT_MULTIPLIER)
 endif
 
 # C specific options here (added to USE_OPT).

mock/global.h

@@ -1,3 +0,0 @@
-// test value just for unit tests
-
-#define US_TO_NT_MULTIPLIER 100

util/include/rusefi/rusefi_time_math.h

@@ -1,16 +1,27 @@
+#pragma once
+
+#include <type_traits>
 
-#include <global.h>
 #include <rusefi/rusefi_time_types.h>
 
+static_assert(
+    std::is_same_v<decltype(US_TO_NT_MULTIPLIER), int>,
+    "US_TO_NT_MULTIPLIER macro should be defined as a positive integer value"
+);
+
+constexpr int TICKS_IN_US = US_TO_NT_MULTIPLIER;
+
+static_assert(0 < TICKS_IN_US, "US_TO_NT_MULTIPLIER macro should be defined as a positive integer value");
+
 // microseconds to ticks, but floating point
 // If converting a floating point time period, use this macro to avoid
 // the expensive conversions from int64 <-> float
-#define USF2NT(us_float) ((us_float) * US_TO_NT_MULTIPLIER)
+#define USF2NT(us_float) ((us_float) * TICKS_IN_US)
 #define USF2MS(us_float) (0.001f * (us_float))
 
 // And back
-#define NT2US(x) ((x) / US_TO_NT_MULTIPLIER)
-#define NT2USF(x) (((float)(x)) / US_TO_NT_MULTIPLIER)
+#define NT2US(x) ((x) / TICKS_IN_US)
+#define NT2USF(x) (((float)(x)) / TICKS_IN_US)
 
 #define NT_PER_SECOND (US2NT(US_PER_SECOND_LL))