esp8266/modpybpin: Use None instead of PULL_NONE for no-pull config.

esp8266/modpybpin.c

@@ -180,12 +180,12 @@ STATIC void pyb_pin_print(const mp_print_t *print, mp_obj_t self_in, mp_print_ki
     mp_printf(print, "Pin(%u)", self->phys_port);
 }
 
-// pin.init(mode, pull=Pin.PULL_NONE, af=-1)
+// pin.init(mode, pull=None, *, value)
 STATIC mp_obj_t pyb_pin_obj_init_helper(pyb_pin_obj_t *self, mp_uint_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
     enum { ARG_mode, ARG_pull, ARG_value };
     static const mp_arg_t allowed_args[] = {
         { MP_QSTR_mode, MP_ARG_REQUIRED | MP_ARG_INT },
-        { MP_QSTR_pull, MP_ARG_INT, {.u_int = GPIO_PULL_NONE}},
+        { MP_QSTR_pull, MP_ARG_OBJ, {.u_obj = mp_const_none}},
         { MP_QSTR_value, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL}},
     };
 
@@ -197,7 +197,10 @@ STATIC mp_obj_t pyb_pin_obj_init_helper(pyb_pin_obj_t *self, mp_uint_t n_args, c
     uint mode = args[ARG_mode].u_int;
 
     // get pull mode
-    uint pull = args[ARG_pull].u_int;
+    uint pull = GPIO_PULL_NONE;
+    if (args[ARG_pull].u_obj != mp_const_none) {
+        pull = mp_obj_get_int(args[ARG_pull].u_obj);
+    }
 
     // get initial value
     int value;
@@ -343,7 +346,6 @@ STATIC const mp_map_elem_t pyb_pin_locals_dict_table[] = {
     { MP_OBJ_NEW_QSTR(MP_QSTR_IN),        MP_OBJ_NEW_SMALL_INT(GPIO_MODE_INPUT) },
     { MP_OBJ_NEW_QSTR(MP_QSTR_OUT),       MP_OBJ_NEW_SMALL_INT(GPIO_MODE_OUTPUT) },
     { MP_OBJ_NEW_QSTR(MP_QSTR_OPEN_DRAIN), MP_OBJ_NEW_SMALL_INT(GPIO_MODE_OPEN_DRAIN) },
-    { MP_OBJ_NEW_QSTR(MP_QSTR_PULL_NONE), MP_OBJ_NEW_SMALL_INT(GPIO_PULL_NONE) },
     { MP_OBJ_NEW_QSTR(MP_QSTR_PULL_UP),   MP_OBJ_NEW_SMALL_INT(GPIO_PULL_UP) },
     //{ MP_OBJ_NEW_QSTR(MP_QSTR_PULL_DOWN), MP_OBJ_NEW_SMALL_INT(GPIO_PULL_DOWN) },