esp8266/modmachine: Implement dummy sleep() function.

esp8266/modmachine.c

@@ -26,6 +26,7 @@
  */
 
 #include <stdint.h>
+#include <stdio.h>
 
 #include "py/obj.h"
 #include "py/runtime.h"
@@ -88,6 +89,12 @@ STATIC mp_obj_t machine_idle(void) {
 }
 STATIC MP_DEFINE_CONST_FUN_OBJ_0(machine_idle_obj, machine_idle);
 
+STATIC mp_obj_t machine_sleep(void) {
+    printf("Warning: not yet implemented\n");
+    return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_0(machine_sleep_obj, machine_sleep);
+
 STATIC mp_obj_t machine_deepsleep(void) {
     // default to sleep forever
     uint32_t sleep_us = 0;
@@ -229,6 +236,7 @@ STATIC const mp_rom_map_elem_t machine_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_reset_cause), MP_ROM_PTR(&machine_reset_cause_obj) },
     { MP_ROM_QSTR(MP_QSTR_unique_id), MP_ROM_PTR(&machine_unique_id_obj) },
     { MP_ROM_QSTR(MP_QSTR_idle), MP_ROM_PTR(&machine_idle_obj) },
+    { MP_ROM_QSTR(MP_QSTR_sleep), MP_ROM_PTR(&machine_sleep_obj) },
     { MP_ROM_QSTR(MP_QSTR_deepsleep), MP_ROM_PTR(&machine_deepsleep_obj) },
 
     { MP_ROM_QSTR(MP_QSTR_disable_irq), MP_ROM_PTR(&machine_disable_irq_obj) },