[python] Restore the should_interrupt routine

python/Makefile

@@ -182,7 +182,7 @@ python/src/extmod/modurandom.o: SFLAGS += -DMP_QSTR_urandom="MP_QSTR_random"
 port_objs += $(addprefix python/port/,\
   port.o \
   builtins.o\
-  interrupt_helper.o \
+  helpers.o \
   modkandinsky.o \
   modkandinsky_impl.o \
   mphalport.o \

python/port/helpers.cpp

@@ -1,10 +1,10 @@
-#include "interrupt_helper.h"
+#include "helpers.h"
 #include <ion.h>
 extern "C" {
 #include "mphalport.h"
 }
 
-void shouldInterrupt() {
+void micropython_port_should_interrupt() {
   static int c = 0;
   c++;
   if (c%20000 != 0) {

python/port/helpers.h

@@ -0,0 +1,16 @@
+#ifndef PYTHON_PORT_HELPERS_H
+#define PYTHON_PORT_HELPERS_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* should_interrupt effectively does something once every 20000 calls. It checks
+ * if a key is down to raise an interruption flag. */
+void micropython_port_should_interrupt();
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

python/port/interrupt_helper.h

@@ -1,17 +0,0 @@
-#ifndef PYTHON_INTERRUPT_HELPER_H
-#define PYTHON_INTERRUPT_HELPER_H
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/* shouldInterrupt effectively does something once every 20000 calls. It checks
- * if a key is down to raise an interruption flag. */
-
-void shouldInterrupt();
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif

python/port/mpconfigport.h

@@ -1,4 +1,5 @@
 #include <stdint.h>
+#include "helpers.h"
 
 // options to control how Micro Python is built
 
@@ -55,6 +56,8 @@
 #define MICROPY_LONGINT_IMPL        (MICROPY_LONGINT_IMPL_MPZ)
 #define MICROPY_FLOAT_IMPL          (MICROPY_FLOAT_IMPL_DOUBLE)
 
+#define MICROPY_VM_HOOK_LOOP micropython_port_should_interrupt();
+
 // type definitions for the specific machine
 
 #define MICROPY_MAKE_POINTER_CALLABLE(p) ((void*)((mp_uint_t)(p) | 1))