2023-10-24 01:21:37 +08:00
|
|
|
|
=======================
|
2023-10-21 18:24:43 +08:00
|
|
|
|
``can`` CAN Device Test
|
|
|
|
|
|
=======================
|
|
|
|
|
|
|
|
|
|
|
|
If the CAN device is configured in loopback mode, then this example can be used
|
|
|
|
|
|
to test the CAN device in loop back mode. It simple sinces a sequence of CAN
|
|
|
|
|
|
messages and verifies that those messages are returned exactly as sent.
|
|
|
|
|
|
|
|
|
|
|
|
This test depends on these specific CAN/NSH configurations settings (your
|
|
|
|
|
|
specific CAN settings might require additional settings).
|
|
|
|
|
|
|
|
|
|
|
|
- ``CONFIG_CAN`` – Enables CAN support.
|
|
|
|
|
|
- ``CONFIG_CAN_LOOPBACK`` – A CAN driver may or may not support a loopback mode
|
|
|
|
|
|
for testing. The STM32 CAN driver does support loopback mode.
|
|
|
|
|
|
- ``CONFIG_NSH_BUILTIN_APPS`` – Build the CAN test as an NSH built-in function.
|
|
|
|
|
|
Default: Built as a standalone program.
|
|
|
|
|
|
|
|
|
|
|
|
Specific configuration options for this example include:
|
|
|
|
|
|
|
|
|
|
|
|
- ``CONFIG_EXAMPLES_CAN_DEVPATH`` – The path to the CAN device. Default:
|
|
|
|
|
|
``/dev/can0``.
|
|
|
|
|
|
- ``CONFIG_EXAMPLES_CAN_NMSGS`` – This number of CAN message is collected and the
|
|
|
|
|
|
program terminates. Default: messages are sent and received indefinitely.
|
|
|
|
|
|
|
|
|
|
|
|
The default behavior assumes loopback mode. Messages are sent, then read and
|
|
|
|
|
|
verified. The behavior can be altered for other kinds of testing where the test
|
|
|
|
|
|
only sends or received (but does not verify) can messages.
|
|
|
|
|
|
|
|
|
|
|
|
- ``CONFIG_EXAMPLES_CAN_READONLY`` – Only receive messages.
|
|
|
|
|
|
- ``CONFIG_EXAMPLES_CAN_WRITEONLY`` – Only send messages.
|
