增加 常见问题解决.

Signed-off-by: rick.chan <cy@sina.com>

Software/Applications/VSCode/VSCode_ARM_CortexM_开发.md

@@ -1,10 +1,10 @@
 ---
 layout:      post
 title:       "VSCode ARM CortexM 开发"
-subtitle:    ""
+subtitle:    "VSCode EIDE 插件的配置和使用"
 description: "讲述如何使用 VSCode 进行 MCU 系统开发。"
 excerpt:     "VSCode 及 Embedded IDE、Cortex-Debug 扩展介绍。"
-date:        2023-11-13 19:11:00
+date:        2024-03-15 15:58:00
 author:      "Rick Chan"
 tags:        ["Applications", "VSCode"]
 categories:  ["Software"]
@@ -20,6 +20,8 @@ published:   true
   - [3.1. PyOCD 的安装](#31-pyocd-的安装)
   - [3.2. 关于 PyOCD 的扩展说明](#32-关于-pyocd-的扩展说明)
   - [3.3 PyOCD 常用命令](#33-pyocd-常用命令)
+- [4. 常见问题解决](#4-常见问题解决)
+  - [4.1. GCC 链接错误 引用未定义函数 \_read \_write \_sbrk](#41-gcc-链接错误-引用未定义函数-_read-_write-_sbrk)
 
 VSCode 的嵌入式开发插件具备了相当多的功能，这里主要使用 Embedded IDE，这是一个支持 MCU 开发的工具，但不具备调试功能，为了调试 ARM Cortex-M MCUs，可以配合安装 Cortex-Debug 插件。这两个插件直接在扩展商店进行搜索安装即可，下面主要介绍使用方法。
 
@@ -191,3 +193,28 @@ C:\Users\<User Name>\AppData\Local\cmsis-pack-manager\cmsis-pack-manager
 pyocd pack find <part keyword>
 pyocd pack install <part number>
 ```
+
+## 4. 常见问题解决
+
+### 4.1. GCC 链接错误 引用未定义函数 _read _write _sbrk
+
+```bash
+d:/gcc-arm-none-eabi-4_9/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/lib/armv7-m\libc_nano.a(lib_a-sbrkr.o): In function `_sbrk_r':
+sbrkr.c:(.text._sbrk_r+0xc): undefined reference to `_sbrk'
+d:/gcc-arm-none-eabi-4_9/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/lib/armv7-m\libc_nano.a(lib_a-writer.o): In function `_write_r':
+writer.c:(.text._write_r+0x10): undefined reference to `_write'
+d:/gcc-arm-none-eabi-4_9/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/lib/armv7-m\libc_nano.a(lib_a-closer.o): In function `_close_r':
+closer.c:(.text._close_r+0xc): undefined reference to `_close'
+d:/gcc-arm-none-eabi-4_9/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/lib/armv7-m\libc_nano.a(lib_a-fstatr.o): In function `_fstat_r':
+fstatr.c:(.text._fstat_r+0xe): undefined reference to `_fstat'
+d:/gcc-arm-none-eabi-4_9/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/lib/armv7-m\libc_nano.a(lib_a-isattyr.o): In function `_isatty_r':
+isattyr.c:(.text._isatty_r+0xc): undefined reference to `_isatty'
+d:/gcc-arm-none-eabi-4_9/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/lib/armv7-m\libc_nano.a(lib_a-lseekr.o): In function `_lseek_r':
+lseekr.c:(.text._lseek_r+0x10): undefined reference to `_lseek'
+d:/gcc-arm-none-eabi-4_9/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/lib/armv7-m\libc_nano.a(lib_a-readr.o): In function `_read_r':
+readr.c:(.text._read_r+0x10): undefined reference to `_read'
+```
+
+在 Builder Configurations -> Builder Options 中进行修改。
+
+选择 Global Options 或 Linker，添加或删除 “--specs=nosys.spece”(文章：[ARM GCC 链接错误 引用未定义函数 _read _write _sbrk 解决和重定向](https://blog.csdn.net/daxiebao/article/details/52653657) 中说要添加该参数，但我实际项目中已经添加了该参数仍然报出了这个警告，删除后警告消失)。