Have you tried to develop a key input feature on your small embedded platform with a serial input? It is not so easy to implement correctly because the input methodology is using a complicated protocol known as VT100. In my recent project "Natural Tiny Shell (NT-Shell)" provides VT100 compatible terminal control features for small embedded systems. However, the middleware is still large for small embedded processors such as 8-bit MCUs, 16-bit MCUs and also for small 32-bit MCUs like Cortex-M0. This "MicroShell" middleware provides a minimal terminal control for the platforms.

• Compatible with VT100 :)
• Really simple.
  • The API of the microshell module has only two functions.
  • It consists of only two small modules in the core layer.
• Highly portable.
  • Compatible with C89.
  • No dependencies. (even libc!)
  • No dynamic memory allocation. (no need a operating system!)
• Small code foot print.
  • ROM: Less than 5.0KB
  • RAM: Less than 0.5KB

Action	Key input
Move to the start of line	CTRL+A or Home
Move to the end of line	CTRL+E or End
Move forward one character	CTRL+F or Right arrow
Move back one character	CTRL+B or Left arrow
Delete previous character	Backspace
Delete current character	CTRL+D or Delete
Cancel current input line	CTRL+C