esp8266/mpconfigport.h: Add definitions for BEGIN/END_ATOMIC_SECTION.
These are needed to ensure correct operation of the MicroPython scheduler.
#define MICROPY_VM_HOOK_LOOP MICROPY_VM_HOOK_POLL
#define MICROPY_VM_HOOK_RETURN MICROPY_VM_HOOK_POLL
+#include "xtirq.h"
+#define MICROPY_BEGIN_ATOMIC_SECTION() disable_irq()
+#define MICROPY_END_ATOMIC_SECTION(state) enable_irq(state)
+
// type definitions for the specific machine
#define MICROPY_MAKE_POINTER_CALLABLE(p) ((void *)((mp_uint_t)(p)))
