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fix the confilcts with sensor v1
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Signed-off-by: Shell <[email protected]>
Co-authored-by: xqyjlj <[email protected]>
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and RT_SERIAL_TX_BLOCKING
为什么提交这份PR (why to submit this PR)
serial_v2驱动框架，rt_serial_tx_enable()函数，在 DMA阻塞发送(RT_DEVICE_FLAG_DMA_TX and RT_SERIAL_TX_BLOCKING) 的时候，使用rt_malloc分配了tx_fifo内存，但是并未对tx_fifo->rb.buffer_ptr指针进行初始化（rt_malloc不会自动初始化内存），因此可能导致buffer_ptr是一个随机指针。但是rt_serail_write()函数需要根据tx_fifo->rb.buffer_ptr是否为RT_NULL来判断是调用_serial_fifo_tx_blocking_nbuf()还是_serial_fifo_tx_blocking_buf()。
由于tx_fifo->rb.buffer_ptr可能是一个随机值（不一定为RT_NULL=0），导致RT_DEVICE_FLAG_DMA_TX and RT_SERIAL_TX_BLOCKING模式下调用了_serial_fifo_tx_blocking_buf()，但是rb没有真正开辟内存空间，导致内存异常
你的解决方案是什么 (what is your solution)
rt_serial_tx_enable()，在DMA阻塞发送分支下，对tx_fifo->rb.buffer_ptr进行初始化，赋值为RT_NULL。
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sensor v2框架仍在开发中
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Signed-off-by: Shell <[email protected]>
Co-authored-by: Shell <[email protected]>
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rt_ssize_t can give negative error code, which follows the unix style correctly
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修复阻塞模式下中断发送的逻辑顺序问题与多线程下的竞态条件 (#7997)
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GCC like means the toolchains which are compatible with GCC
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Signed-off-by: Fan YANG <[email protected]>
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Signed-off-by: GuEe-GUI <[email protected]>
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