circuitpython/shared-bindings/canio/__init__.c

125 lines
5.2 KiB
C
Raw Normal View History

/*
* 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.
*/
//| """CAN bus access
//|
2020-09-21 18:04:30 -04:00
//| The `canio` module contains low level classes to support the CAN bus
//| protocol.
//|
2020-09-16 13:07:15 -04:00
//| CAN and Listener classes change hardware state and should be deinitialized when they
//| are no longer needed if the program continues after use. To do so, either
//| call :py:meth:`!deinit` or use a context manager. See
//| :ref:`lifetime-and-contextmanagers` for more info.
//|
//| For example::
//|
2020-09-21 18:04:30 -04:00
//| import canio
//| from board import *
//|
2020-09-21 18:04:30 -04:00
//| can = canio.CAN(board.CAN_RX, board.CAN_TX, baudrate=1000000)
//| message = canio.Message(id=0x0408, data="adafruit"
2020-09-16 13:07:15 -04:00
//| can.write(message))
//| can.deinit()
//|
//| This example will write the data 'adafruit' onto the CAN bus to any
2020-09-16 13:16:30 -04:00
//| device listening for message id 0x0408.
//|
//| A CAN bus involves a transceiver, which is often a separate chip with a "standby" pin.
//| If your board has a CAN_STANDBY pin, ensure to set it to an output with the value False
//| to enable the transceiver.
//|
//| Other implementations of the CAN device may exist (for instance, attached
//| via an SPI bus). If so their constructor arguments may differ, but
//| otherwise we encourage implementors to follow the API that the core uses.
//| """
//|
#include "py/obj.h"
#include "py/enum.h"
#include "shared-bindings/canio/__init__.h"
#include "shared-bindings/canio/CAN.h"
#include "shared-bindings/canio/Match.h"
#include "shared-bindings/canio/Message.h"
#include "shared-bindings/canio/Listener.h"
MAKE_ENUM_VALUE(canio_bus_state_type, bus_state, ERROR_ACTIVE, BUS_STATE_ERROR_ACTIVE);
MAKE_ENUM_VALUE(canio_bus_state_type, bus_state, ERROR_PASSIVE, BUS_STATE_ERROR_PASSIVE);
MAKE_ENUM_VALUE(canio_bus_state_type, bus_state, ERROR_WARNING, BUS_STATE_ERROR_WARNING);
MAKE_ENUM_VALUE(canio_bus_state_type, bus_state, BUS_OFF, BUS_STATE_OFF);
//| class BusState:
//| """The state of the CAN bus"""
//|
//| ERROR_ACTIVE: object
//| """The bus is in the normal (active) state"""
//|
//| ERROR_WARNING: object
2020-09-16 13:16:30 -04:00
//| """The bus is in the normal (active) state, but a moderate number of errors have occurred recently.
//|
//| NOTE: Not all implementations may use ERROR_WARNING. Do not rely on seeing ERROR_WARNING before ERROR_PASSIVE."""
//|
//| ERROR_PASSIVE: object
2020-09-16 13:16:30 -04:00
//| """The bus is in the passive state due to the number of errors that have occurred recently.
//|
//| This device will acknowledge packets it receives, but cannot transmit messages.
//| If additional errors occur, this device may progress to BUS_OFF.
//| If it successfully acknowledges other packets on the bus, it can return to ERROR_WARNING or ERROR_ACTIVE and transmit packets.
//| """
//|
//| BUS_OFF: object
2020-09-16 13:16:30 -04:00
//| """The bus has turned off due to the number of errors that have
//| occurred recently. It must be restarted before it will send or receive
//| packets. This device will neither send or acknowledge packets on the bus."""
//|
MAKE_ENUM_MAP(canio_bus_state) {
MAKE_ENUM_MAP_ENTRY(bus_state, ERROR_ACTIVE),
MAKE_ENUM_MAP_ENTRY(bus_state, ERROR_PASSIVE),
MAKE_ENUM_MAP_ENTRY(bus_state, ERROR_WARNING),
MAKE_ENUM_MAP_ENTRY(bus_state, BUS_OFF),
};
STATIC MP_DEFINE_CONST_DICT(canio_bus_state_locals_dict, canio_bus_state_locals_table);
2020-09-21 18:04:30 -04:00
MAKE_PRINTER(canio, canio_bus_state);
2020-09-21 18:04:30 -04:00
MAKE_ENUM_TYPE(canio, BusState, canio_bus_state);
STATIC const mp_rom_map_elem_t canio_module_globals_table[] = {
{ MP_ROM_QSTR(MP_QSTR_BusState), MP_ROM_PTR(&canio_bus_state_type) },
{ MP_ROM_QSTR(MP_QSTR_CAN), MP_ROM_PTR(&canio_can_type) },
{ MP_ROM_QSTR(MP_QSTR_Listener), MP_ROM_PTR(&canio_listener_type) },
{ MP_ROM_QSTR(MP_QSTR_Match), MP_ROM_PTR(&canio_match_type) },
{ MP_ROM_QSTR(MP_QSTR_Message), MP_ROM_PTR(&canio_message_type) },
{ MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR__canio) },
};
STATIC MP_DEFINE_CONST_DICT(canio_module_globals, canio_module_globals_table);
const mp_obj_module_t canio_module = {
.base = { &mp_type_module },
.globals = (mp_obj_dict_t*)&canio_module_globals,
};