1 files changed, 150 insertions, 0 deletions
diff --git a/circuitpython/shared-bindings/canio/Message.c b/circuitpython/shared-bindings/canio/Message.c
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+++ b/circuitpython/shared-bindings/canio/Message.c
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+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020 Jeff Epler for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "shared-bindings/canio/Message.h"
+
+#include "py/obj.h"
+#include "py/objproperty.h"
+#include "py/runtime.h"
+
+//| class Message:
+//|     def __init__(self, id: int, data: bytes, *, extended: bool = False) -> None:
+//|         """Construct a Message to send on a CAN bus.
+//|
+//|         :param int id: The numeric ID of the message
+//|         :param bytes data: The content of the message
+//|         :param bool extended: True if the message has an extended identifier, False if it has a standard identifier
+//|
+//|         In CAN, messages can have a length from 0 to 8 bytes.
+//|         """
+//|         ...
+//|
+STATIC mp_obj_t canio_message_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
+    enum { ARG_id, ARG_data, ARG_extended, NUM_ARGS };
+    static const mp_arg_t allowed_args[] = {
+        { MP_QSTR_id, MP_ARG_INT | MP_ARG_REQUIRED },
+        { MP_QSTR_data, MP_ARG_OBJ | MP_ARG_REQUIRED },
+        { MP_QSTR_extended, MP_ARG_BOOL, {.u_bool = false} },
+    };
+    mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
+    MP_STATIC_ASSERT(MP_ARRAY_SIZE(allowed_args) == NUM_ARGS);
+
+    mp_arg_parse_all_kw_array(n_args, n_kw, all_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
+
+    mp_buffer_info_t data;
+    mp_get_buffer_raise(args[ARG_data].u_obj, &data, MP_BUFFER_READ);
+
+    if (data.len > 8) {
+        mp_raise_ValueError(translate("Messages limited to 8 bytes"));
+    }
+
+    canio_message_obj_t *self = m_new_obj(canio_message_obj_t);
+    self->base.type = &canio_message_type;
+    common_hal_canio_message_construct(self, args[ARG_id].u_int, data.buf, data.len, args[ARG_extended].u_bool);
+    return self;
+}
+
+//|     id: int
+//|     """The numeric ID of the message"""
+//|
+STATIC mp_obj_t canio_message_id_get(const mp_obj_t self_in) {
+    canio_message_obj_t *self = self_in;
+    return MP_OBJ_NEW_SMALL_INT(common_hal_canio_message_get_id(self));
+}
+MP_DEFINE_CONST_FUN_OBJ_1(canio_message_id_get_obj, canio_message_id_get);
+
+STATIC mp_obj_t canio_message_id_set(const mp_obj_t self_in, const mp_obj_t id) {
+    canio_message_obj_t *self = self_in;
+    common_hal_canio_message_set_id(self, mp_obj_get_int(id));
+    return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_2(canio_message_id_set_obj, canio_message_id_set);
+
+MP_PROPERTY_GETSET(canio_message_id_obj,
+    (mp_obj_t)&canio_message_id_get_obj,
+    (mp_obj_t)&canio_message_id_set_obj);
+
+//|     data: bytes
+//|     """The content of the message"""
+//|
+STATIC mp_obj_t canio_message_data_get(const mp_obj_t self_in) {
+    canio_message_obj_t *self = self_in;
+    return mp_obj_new_bytes((const byte *)common_hal_canio_message_get_data(self), common_hal_canio_message_get_length(self));
+}
+MP_DEFINE_CONST_FUN_OBJ_1(canio_message_data_get_obj, canio_message_data_get);
+
+STATIC mp_obj_t canio_message_data_set(const mp_obj_t self_in, const mp_obj_t data_in) {
+    canio_message_obj_t *self = self_in;
+    mp_buffer_info_t data;
+    mp_get_buffer_raise(data_in, &data, MP_BUFFER_READ);
+    if (data.len > 8) {
+        mp_raise_ValueError(translate("Messages limited to 8 bytes"));
+    }
+    common_hal_canio_message_set_data(self, data.buf, data.len);
+    return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_2(canio_message_data_set_obj, canio_message_data_set);
+
+
+MP_PROPERTY_GETSET(canio_message_data_obj,
+    (mp_obj_t)&canio_message_data_get_obj,
+    (mp_obj_t)&canio_message_data_set_obj);
+
+
+//|     extended: bool
+//|     """True if the message's id is an extended id"""
+//|
+STATIC mp_obj_t canio_message_extended_get(const mp_obj_t self_in) {
+    canio_message_obj_t *self = self_in;
+    return mp_obj_new_bool(common_hal_canio_message_get_extended(self));
+}
+MP_DEFINE_CONST_FUN_OBJ_1(canio_message_extended_get_obj, canio_message_extended_get);
+
+STATIC mp_obj_t canio_message_extended_set(const mp_obj_t self_in, const mp_obj_t extended) {
+    canio_message_obj_t *self = self_in;
+    common_hal_canio_message_set_extended(self, mp_obj_is_true(extended));
+    return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_2(canio_message_extended_set_obj, canio_message_extended_set);
+
+
+MP_PROPERTY_GETSET(canio_message_extended_obj,
+    (mp_obj_t)&canio_message_extended_get_obj,
+    (mp_obj_t)&canio_message_extended_set_obj);
+
+STATIC const mp_rom_map_elem_t canio_message_locals_dict_table[] = {
+    { MP_ROM_QSTR(MP_QSTR_id), MP_ROM_PTR(&canio_message_id_obj) },
+    { MP_ROM_QSTR(MP_QSTR_data), MP_ROM_PTR(&canio_message_data_obj) },
+    { MP_ROM_QSTR(MP_QSTR_extended), MP_ROM_PTR(&canio_message_extended_obj) },
+};
+STATIC MP_DEFINE_CONST_DICT(canio_message_locals_dict, canio_message_locals_dict_table);
+
+const mp_obj_type_t canio_message_type = {
+    { &mp_type_type },
+    .name = MP_QSTR_Message,
+    .make_new = canio_message_make_new,
+    .locals_dict = (mp_obj_t)&canio_message_locals_dict,
+};