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With the new Kconfig preprocessor (described in https://github.com/torvalds/linux/blob/master/Documentation/kbuild/ kconfig-macro-language.txt), the syntax for expanding environment variables is $(FOO) rather than $FOO. $(FOO) is a general preprocessor variable expansion, which falls back to environment variables if the variable isn't set (like in Make). It can also be used in prompts, 'comment's, etc. The old syntax will probably be supported forever in Kconfiglib for backwards compatibility, but might as well make it consistent now that people might start using the preprocessor more. Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no> |
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| src | ||
| CMakeLists.txt | ||
| Kconfig | ||
| prj.conf | ||
| README.rst | ||
| sample.yaml | ||
.. _can-sample: Controller Area Network ####################### Overview ******** This sample demonstrates how to use the Controller Area Network (CAN) API. Messages with standard and extended identifiers are sent over the bus, triggered by a button event. Messages are received using message queues and ISRs. Reception is indicated by blink LEDs and output to the console. Building and Running ******************** In loopback mode, the board receives its own messages. This could be used for standalone testing. The sample can be built and executed on boards supporting CAN. The output ports and pins of the LEDs can be configured by Kconfig. Sample output ============= .. code-block:: console Finished init. waiting for Interrupts TX thread is running. filter id: 1 Button pressed! Send message 1 Button pressed 1 times Button pressed! Send message 0 Button pressed 2 times String sent over CAN Button pressed! Send message 1 Button pressed 3 times Button pressed! Send message 0 Button pressed 4 times String sent over CAN .. note:: The values shown above might differ.