git subrepo clone https://github.com/libopencm3/libopencm3

subrepo:
  subdir:   "libopencm3"
  merged:   "f5813a54"
upstream:
  origin:   "https://github.com/libopencm3/libopencm3"
  branch:   "master"
  commit:   "f5813a54"
git-subrepo:
  version:  "0.4.3"
  origin:   "???"
  commit:   "???"

libopencm3/doc/HACKING

@@ -0,0 +1,106 @@
+libopencm3 Documentation
+12 October 2012 (C) K Sarkies
+-----------------------------
+
+Each family and subfamily of devices has a separate directory and configuration
+files. Doxygen is run independently on each of these and the result is
+integrated under a single HTML page. 
+Due to relative referencing used in the files, the directory
+structure is important and should be maintained.
+The Makefile will automatically generate the list of input files based on the
+current library makefiles, so you _must_ have run built the library itself first.
+
+Each of the subdirectories has a configuration file, a layout file and
+subdirectories for the documentation. Doxygen is intended to be run inside
+these subdirectories. The Makefile will handle this in the appropriate
+order.
+
+Markup
+------
+
+Each family has been given a group name that will allow subgrouping of API
+functions and defines in the documentation.
+
+The header and source files for each peripheral in each family must have a
+heading section in which an @defgroup defines the group name for the particular
+peripheral. This group name will be the same across all families as each one
+is documented separately. Thus for a peripheral xxx the header will have a
+group name xxx_defines and the source file will have xxx_file. This will allow
+the group to appear separately. An @ingroup must be provided to place the group
+as a subgroup of the appropriate family grouping. Note that @file is not used.
+
+The heading section must include the version number and date and authors names
+plus a license reference. Any documentation specific to the family can be
+included here. If there are common files included then their documentation will
+appear in a separate section.
+
+Common header and source files that are included into a number of families must
+have an @addgroup to include its documentation into the appropriate peripheral
+group. These headings may include authors and any specific descriptions but the
+date and version number must be omitted as it will be included from the family
+files. There must not be any reference to family groupings as these common files
+will be incorporated into multiple family groups.
+
+The common files should not be included in an application explicitly. Also the
+doxygen preprocessor must be enabled to ensure that all macros and defines are
+included. This means that common header files need to have a section at the top 
+of the file of the type (eg for gpio_common_f24.h):
+
+/** @cond */
+#ifdef LIBOPENCM3_GPIO_H
+/** @endcond */
+
+and at the end of the file:
+
+/** @cond */
+#else
+#warning "gpio_common_f24.h should not be included explicitly, only via gpio.h"
+#endif
+/** @endcond */
+
+This will stop the compiler preprocessor from including the common header file
+unless the device family header file has also been included. The doxygen
+conditional clauses are needed to stop the doxygen preprocessor seeing this
+statement and so excluding processing of the common file contents.
+
+/** @cond */
+#if defined(LIBOPENCM3_GPIO_H) || defined(LIBOPENCM3_GPIO_COMMON_F24_H)
+/** @endcond */
+
+Each helper function must have a header with an @brief, and where appropriate
+additional description, @parameter and @return elements. These latter must
+describe the allowable parameter ranges preferably with reference to a suitable
+define in the corresponding header file.
+
+The Doxyfile for a family must include input files from the header and source
+subdirectories, as well as all needed common files. The common files can be
+added separately or as an entire directory with exclusions of inappropriate
+files.
+
+Doxyfiles
+---------
+
+Doxyfile_common holds global settings.
+
+OUTPUT_DIRECTORY blank so that the output is placed in the current directory.
+RECURSIVE = NO
+EXTERNAL_GROUPS = NO
+
+Each Doxyfile_include for a processor family has:
+
+@INCLUDE = ../Doxyfile_common
+INPUT = specific directories needed, including /include/libopencm3/cm3
+		in top directory to set the top level page and GNU license.
+LAYOUT_FILE = DoxygenLayout_$processor.xml
+WARN_LOGFILE = doxygen_$processor.log
+TAGFILES = ../cm3/cm3.tag=../../cm3/html
+GENERATE_TAGFILE = $processor.tag
+PREDEFINED = list of macro definitions
+
+For the top level Doxyfile
+
+INPUT = ../include/libopencm3/docmain.dox to add in the main page text
+LAYOUT_FILE = DoxygenLayout.xml
+WARN_LOGFILE = doxygen.log
+TAGFILES = cm3/cm3.tag=../cm3/html plus all families to be included.
+