支持半主机模式

[supperthomas]

https://wiki.segger.com/SEGGER_Semihosting

[supperthomas]

https://www.segger.com/products/development-tools/embedded-studio/technology/semihosting/

[supperthomas]

https://interrupt.memfault.com/blog/arm-semihosting

[supperthomas]

keil 不支持。

[supperthomas]

https://mp.weixin.qq.com/s/zfgnuhSFL1LxbzBGK3qsnA