记录一个坑关于STM32 ARM Compiler Version

在用 Keil 进行 STM32 开发的时候，一开始下载，下载的 ARM 编译器是 Version6，他就不兼容老的代码，就很抽象。

所以必须要更换编译器。

可以去官网下载编译器 Downloads - Arm Developer ，也可以自己找资源哈（百度网盘请输入提取码）

那编译器下载好后，要注意安装的地址，一定要在keil5安装的 ARM 目录下，不然会报License错误。

例如：

ARMLMD_LICENSE_FILE is not set. You must set this to the path to your license.
Information about this error is available at: http://ds.arm.com/support/lic87/m1General licensing information is available at: http://ds.arm.com/support/licensing/If you need further help, provide this complete error report to your supplier or license.support@arm.com.- ARMLMD_LICENSE_FILE: unset- LM_LICENSE_FILE: unset- ARM_TOOL_VARIANT: unset- ARM_PRODUCT_PATH: unset- Product location: C:\soft\arm-compiler-Version5\sw\mappings- Toolchain location: C:\soft\arm-compiler-Version5\Bin- Selected tool variant: product- Checkout feature: compiler5- Feature version: 5.0202006- Flex error code: -1
Product: ARM Compiler 5.06
Component: ARM Compiler 5.06 update 7 (build 960)
Tool: ArmCC [4d365d]
".\Objects\Project.axf" - 28 Error(s), 0 Warning(s).
Target not created.
Build Time Elapsed:  00:00:01

后面就是添加编译器了