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I have few question that I am not able to understand.

  1. What is the difference between API and library in embedded software? Any example would be appreciated.
  2. What is CMSIS - is it a library provided by ARM that provides little bit higher level than programming by pointing to the pure registers?
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  1. A library is a piece of code and the way you call the library code is the API.

  2. CMSIS is basically a standard for abstraction layer for different microcontrollers - it defines the API, or the way you call the code in the library to do something.

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CMSIS is not an API...there is no "application" that needs a programming interface. It is not a "library", as there isn't the notion of a library in C.

CMSIS is a group of C header files. They provide a standard way of accessing hardware registers, some intrinsic functions to directly access special assembly instructions, and a few standardized functions for using the ARM architecture. CMSIS is very well documented, so if you look through the examples provided by ARM I'm sure you will get the drift.

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    \$\begingroup\$ CMSIS it is an API. an interface for the application to access the hardware \$\endgroup\$
    – Juraj
    Commented Aug 15, 2021 at 6:25
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    \$\begingroup\$ It might be a matter of opinion, but while C language compiler itself does not have a notion of libraries, the linker sure does. Which means you can include a header to allow your code to call code in a libray and the linker is told to include code in from a library when linking the executable together. Also things like strncmp or memset come from the C standard library. \$\endgroup\$
    – Justme
    Commented Aug 15, 2021 at 7:35
  • \$\begingroup\$ @Justme You are right, that occurred to me later. \$\endgroup\$
    – Elliot Alderson
    Commented Aug 15, 2021 at 12:42

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