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# CMSIS from Atmel Software Foundation (ASF)
The include files in the directory tree are copied from ASF. See
https://spaces.atmel.com/gf/project/asf/frs/?action=FrsReleaseBrowse&frs_package_id=4
(dd. 2016-07-15 ASF version 3.30 was used)
The directory tree was copied "as is" and its structure is as follows:
cmsis
└── samd21
├── include
│ ├── component
│ ├── instance
│ └── pio
└── source
├── gcc
└── iar
There is only one include file (per CPU variant) that should be included in
the source code. For SAMD21 that is cmsis/samd21/include/samd21.h. But
that will only work if the proper define is set. The define is named after
the variant, for example `__SAMD21J18A__`. This define must be set in the
`Makefile.include` of the board.
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.
## Trailing White Space
Because of the whitespace check (dist/tools/whitespacecheck/check.sh) all
the trailing white space had to be removed. Please take this into account
when comparing to the original ASF distribution.
find include/ -name '*.h' -exec sed -i 's/\s*$//' '{}' +
## LITTLE_ENDIAN
These include files define `LITTLE_ENDIAN`. But we think this is wrong. It
seems more logical to let the compiler decide in which mode the ARM code is
to be translated. In include/machine/endian.h there is already a define of
`LITTLE_ENDIAN` (and `BIG_ENDIAN`) for a different purpose.
So, we decided to remove the define from the ASF CMSIS files. The command
for it (running from this directory) is:
find include/ -name '*.h' -exec sed -i '/^#define\s\s*LITTLE_ENDIAN/d' '{}' +
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