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Setting the send status flag `sndchange` after calling the can->ops->sendmsg function
could lead to a race condition if a transmission timeout occurs, resulting in incorrect state handling.
This patch moves the operation of setting the `sndchange` flag to before the call to can->ops->sendmsg.
This ensures that the mailbox's status is correctly marked as "sending" before the hardware begins transmission,
making the driver's state management more robust and reliable, especially in handling exceptions like timeouts.
Additionally, new macros for CAN filter modes have been added in dev_can.h.
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functionality
- Added support for non-blocking mode CAN message sending, including software ring buffer management and dynamic memory allocation options.
- Improved related comments and error handling.
- Updated example code to demonstrate the usage of both blocking and non-blocking sending modes, and corrected some structure field naming and macro definitions.
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修复CAN底层无法工作时导致调用 _can_int_tx 的线程一直挂起的问题
Solution: 使用 can->status.sndchange 的bit位来表示某个发送邮箱超时
如果超时 底层驱动再通知tx_done或者tx_fail事件时不予处理
Signed-off-by: Yucai Liu <[email protected]>
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导致异常
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