добавила флаг состояния прерываний, чтобы не включать их, если кто-то выключил их в setup()

cores/arduino/WInterrupts.c

@@ -6,6 +6,9 @@
 #include "WInterrupts.h"
 #include "wiring_LL.h" 
 
+// interrupts are enabled by default after setup()
+static bool intIsEnabled = true;
+
 typedef void (*voidFuncPtr)(void);
 
 // empty irq handler
@@ -18,14 +21,20 @@ static void nothing(void)
 void interrupts(void)
 {
   GLOBAL_IRQ_ENABLE();
+  intIsEnabled = true;
 }
 
 // disable global interrupts
 void noInterrupts(void)
 {
   GLOBAL_IRQ_DISABLE();
+  intIsEnabled = false;
 }
 
+bool isInterruptsEnabled(void)
+{
+  return intIsEnabled;
+}
 // we can provide no more than 8 interrupts on gpio at the same time
 static volatile voidFuncPtr intFunc[EXTERNAL_INTERRUPTS_QTY] = 
 {

cores/arduino/WInterrupts.h

@@ -6,10 +6,12 @@ extern "C" {
 #endif
 
 #include <stdint.h>
+#include "stdbool.h"
 
 // enable/disable interrupts
 void interrupts(void);
 void noInterrupts(void);
+bool isInterruptsEnabled(void);
 
 // attach/detach interrupt to pin
 void attachInterrupt(uint8_t interruptNum, void (*userFunc)(void), int mode);

cores/arduino/board.cpp

@@ -25,8 +25,8 @@ extern "C" void SystemInit(void)
 // called after setup()
 void post_init(void)
 {
-    // enable global interrupts by default
+    if(isInterruptsEnabled()) // if user has called noInterrupts() in setup(), this value is false
-    interrupts();
+        interrupts(); // enable global interrupts
 }
 
 // --------------------- other --------------------- //