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拉取/合并请求描述:(PR description)

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为什么提交这份PR (why to submit this PR)

  • 提供了rt_hw_us_delay,用以 us 延时。

你的解决方案是什么 (what is your solution)

  • 参考 arm 系列芯片的延时方案,实现 risc-v 系列芯片的 us 延时。

在什么测试环境下测试通过 (what is the test environment)

  • CH32V307VCT6 自制板卡。

]

当前拉取/合并请求的状态 Intent for your PR

必须选择一项 Choose one (Mandatory):

  • 本拉取/合并请求是一个草稿版本 This PR is for a code-review and is intended to get feedback
  • 本拉取/合并请求是一个成熟版本 This PR is mature, and ready to be integrated into the repo

代码质量 Code Quality:

我在这个拉取/合并请求中已经考虑了 As part of this pull request, I've considered the following:

@supperthomas supperthomas merged commit bf45948 into RT-Thread:master Jun 14, 2023
@mysterywolf
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sconscript也得改一下

@mysterywolf mysterywolf mentioned this pull request Jun 16, 2023
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supperthomas added a commit to supperthomas/rt-thread that referenced this pull request Jun 18, 2023
* [bsp/renesas/ebf_qi_min_6m5]use fsp v4.4.0, add sci spi config item, add sci i2c driver, update README.

* [simulator] 添加 simulator in Linux ci (RT-Thread#7664)

* [adc] remove dead code

The variable result_str is never used after this assignment.

* [msh] fix offset used before range check

These uses of offset 'cmd0_size' should follow the range check.

* [libc][ctime] move null pointer check before dereference

This null check was redundant because the pointer timep was
dereferenced in any case.

* [components][time.h]Fixed undefined macro TIMER_ABSTIME

* 向 wch-riscv-bsp 添加 drv_common.c/.h 文件 (RT-Thread#7671)

* BSP support menuconfig for lm3s9b9x

* BSP support menuconfig for lms38962

* Modify code format

* [cpp] support rt-thread CPP wrapper sub-switch macros

* [cpp] attach CXXFLAGS to reduce the resource consumptions

* [bsp][ch32-rsicv][sconscript] add drv_common.c

attach bf45948

* [bsp] BSP support menuconfig for sam7x

* [bsp] BSP support menuconfig for fujitsu

* [bsp][stm32u575] add ADC support

* [bsp][lpc55sxx]update: update keil default project

1.update keil default project
2.add rtduino aht10 demo

* [menuconfig] 修复 menuconfig 相关问题 (RT-Thread#7686)

Co-authored-by: supperthomas <78900636@qq.com>

* [finsh] 添加 RT_Device_Class_Bus 对应的描述字符串

* [ch32][risc-v][bsp] update drv_common for wch risc-v bsp

* [issue] templete

---------

Co-authored-by: vandoul <vandoul@ticks.cn>
Co-authored-by: zhkag <zhkag@foxmail.com>
Co-authored-by: Mingjie Shen <shen497@purdue.edu>
Co-authored-by: yangjie11 <yangjiexaut@126.com>
Co-authored-by: self-confident neko <45762837+muaxiaohei@users.noreply.github.com>
Co-authored-by: dejavudwh <daweihucs@outlook.com>
Co-authored-by: Meco Man <920369182@qq.com>
Co-authored-by: zst123 <zst123@users.noreply.github.com>
Co-authored-by: Shicheng Chu <1468559561@qq.com>
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4 participants