CMSIS from Atmel Software Foundation (ASF)

The include files in the directory tree are copied from ASF (verion 3.35.1).

The directory tree was copied "as is" from ASF path sam0/utils/cmsis/ and its structure is as follows:

cmsis
├── samd21
│   ├── include
│   │   ├── component
│   │   ├── instance
│   │   └── pio
│   └── source
│       ├── gcc
│       └── iar
.
.
.
├── samr21
│   ├── include
│   │   ├── component
│   │   ├── instance
│   │   └── pio
.   └── source
.       ├── gcc
.       └── iar

However, as only the header files in include and its subfolders are required, all source folders are removed.

Be aware that if you want to make changes to any file in this tree that the changes will be lost when a new ASF release is going to be used.

Usage and porting for SAM based CPUs

SAM based CPU should include sam0.h in this directory, which will resolve any CPU family specific includes required.

Currently only SAMD21, SAML21, and SAMR21 based CPUs are supported, i.e., only their CMSIS header files are copied from the ASF. If other CPUs are needed copy CMSIS files from the ASF for the respective CPU family here and adapt sam0.h accordingly.