65 lines
1.6 KiB
ReStructuredText
65 lines
1.6 KiB
ReStructuredText
.. zephyr:code-sample:: can-counter
|
|
:name: Controller Area Network (CAN) counter
|
|
:relevant-api: can_interface
|
|
|
|
Send and receive CAN messages.
|
|
|
|
Overview
|
|
********
|
|
|
|
This sample demonstrates how to use the Controller Area Network (CAN) API.
|
|
Messages with standard and extended identifiers are sent over the bus.
|
|
Messages are received using message-queues and work-queues.
|
|
Reception is indicated by blinking the LED (if present) and output of
|
|
received counter values to the console.
|
|
|
|
Building and Running
|
|
********************
|
|
|
|
In loopback mode, the board receives its own messages. This could be used for
|
|
standalone testing.
|
|
|
|
The LED output pin is defined in the board's devicetree.
|
|
|
|
The sample can be built and executed for boards with a SoC that have an
|
|
integrated CAN controller or for boards with a SoC that has been augmented
|
|
with a stand alone CAN controller.
|
|
|
|
Integrated CAN controller
|
|
=========================
|
|
|
|
For the NXP TWR-KE18F board:
|
|
|
|
.. zephyr-app-commands::
|
|
:zephyr-app: samples/drivers/can/counter
|
|
:board: twr_ke18f
|
|
:goals: build flash
|
|
|
|
Stand alone CAN controller
|
|
==========================
|
|
|
|
For the nrf52dk/nrf52832 board combined with the DFRobot CAN bus V2.0 shield that
|
|
provides the MCP2515 CAN controller:
|
|
|
|
.. zephyr-app-commands::
|
|
:zephyr-app: samples/drivers/can/counter
|
|
:board: nrf52dk/nrf52832
|
|
:shield: dfrobot_can_bus_v2_0
|
|
:goals: build flash
|
|
|
|
Sample output
|
|
=============
|
|
|
|
.. code-block:: console
|
|
|
|
Change LED filter ID: 0
|
|
Finished init.
|
|
Counter filter id: 4
|
|
|
|
uart:~$ Counter received: 0
|
|
Counter received: 1
|
|
Counter received: 2
|
|
Counter received: 3
|
|
|
|
.. note:: The values shown above might differ.
|