esp32/machine_pin: Add Pin.off() and Pin.on() methods.

ports/esp32/machine_pin.c

@@ -221,6 +221,22 @@ STATIC mp_obj_t machine_pin_value(size_t n_args, const mp_obj_t *args) {
 }
 STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(machine_pin_value_obj, 1, 2, machine_pin_value);
 
+// pin.off()
+STATIC mp_obj_t machine_pin_off(mp_obj_t self_in) {
+    machine_pin_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    gpio_set_level(self->id, 0);
+    return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(machine_pin_off_obj, machine_pin_off);
+
+// pin.on()
+STATIC mp_obj_t machine_pin_on(mp_obj_t self_in) {
+    machine_pin_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    gpio_set_level(self->id, 1);
+    return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(machine_pin_on_obj, machine_pin_on);
+
 // pin.irq(handler=None, trigger=IRQ_FALLING|IRQ_RISING)
 STATIC mp_obj_t machine_pin_irq(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
     enum { ARG_handler, ARG_trigger, ARG_wake };
@@ -290,6 +306,8 @@ STATIC const mp_rom_map_elem_t machine_pin_locals_dict_table[] = {
     // instance methods
     { MP_ROM_QSTR(MP_QSTR_init), MP_ROM_PTR(&machine_pin_init_obj) },
     { MP_ROM_QSTR(MP_QSTR_value), MP_ROM_PTR(&machine_pin_value_obj) },
+    { MP_ROM_QSTR(MP_QSTR_off), MP_ROM_PTR(&machine_pin_off_obj) },
+    { MP_ROM_QSTR(MP_QSTR_on), MP_ROM_PTR(&machine_pin_on_obj) },
     { MP_ROM_QSTR(MP_QSTR_irq), MP_ROM_PTR(&machine_pin_irq_obj) },
 
     // class constants