RT-Thread / RT-Thread/rt-thread

[Bug] 在串口V2的驱动里面，_serial_poll_tx 这个函数里面，为什么要判断if (putc_result < 0) break;，这样会导致发送中文错误。

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Dominant language
C
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Description

RT-Thread Version

5.2.2

Hardware Type/Architectures

hpm6750

Develop Toolchain

Other

Describe the bug
Image 5.0.2的是这样的，发送的时候没有判断返回值；直接调用发送； Image 5.2.2的增加了返回值小于0直接break了。发送英文字符的时候没问题，但是当发送中文的时候，会转义，现在bsp的驱动是返回的发送字符，导致发送中文字符就丢数据了。如果没有明确说明putc接口返回值定义说明，这样很多bsp这里就会都出问题。 Image
Other additional context

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Contributor guide

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with the Serial V2 driver’s _serial_poll_tx function and inspect how putc_result is interpreted. Compare the 5.0.2 and 5.2.2 behavior shown in the report, then check the HPM6750 BSP’s putc return value. Done means the return-value contract is clear and Chinese transmission no longer loses data.

Written by the indexing model from the issue text.

Assessment

Tech stack
c
Domain
embedded-iot
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Quiet
Clarity
Mostly clear
Newbie friendliness
48/100

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