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Documentation Status GitHub release GitHub

mipea

minimalistic peripheral access for the Raspberry Pi

This library grants easy and fast access to peripherals.

Contributions are welcome, please fork and open a pull request.

If you have successfully used mipea on a Raspberry Pi which is not tested yet, please inform me and I can add it to the list.

Goal of this library

The library is very useful for high-speed and lighweight applications, efficiency and total control on the hardware level.

I did not create this library for simplicity. It is useful for people who still read the datasheet and know what the registers do but don't want to do the "ugly" work on the low level.

Also, most functions are only a bare "skeleton" with very minimalistic design where other programs need to implement higher level functionality.

If you searched for a efficient and highly customizable library which only lays the foundation for other programs then you are right.

Supported Pis

Raspberry Pi Supported Tested
1 Model A ✔︎
1 Model A+ ✔︎
3 Model A+ ✔︎
1 Model B ✔︎
1 Model B+ ✔︎
2 Model B ✔︎
2 Model Bv1.2 ✔︎
3 Model B ✔︎ ✔︎
3 Model B+ ✔︎ ✔︎
Zero v1.2 ✔︎
Zero ✔︎ ✔︎
Zero W ✔︎
4 Model B experimental ✔︎

Installation

The configure script and Makefile.in are not included in this repository so you have two options to install the library

Download the configure script

On GitHub, when you look under the tab releases you will find some release with a name like for example "v2.0.0". Then you can download the corresponding file named "mipea_x.x.x" which includes the configure script and Makefile.in. After downloading just run these commands from inside the downloaded directory.

$ ./configure
$ make
$ sudo make install

Building the configure script

When you have the GNU autotools and libtool installed you can simply clone the repository and build the configure script and Makefile.in yourself.

$ git clone https://github.com/jasLogic/mipea.git
$ cd mipea
$ autoreconf --install
$ ./configure
$ make
$ sudo make install

Linking

I noticed that sometimes the library can be linked, but when running a program an error message appears saying: File or directory not found. If you have this problem just run ldconfig or follow the output from sudo make install:

----------------------------------------------------------------------
Libraries have been installed in:
   /usr/local/lib

If you ever happen to want to link against installed libraries
in a given directory, LIBDIR, you must either use libtool, and
specify the full pathname of the library, or use the `-LLIBDIR'
flag during linking and do at least one of the following:
   - add LIBDIR to the `LD_LIBRARY_PATH' environment variable
     during execution
   - add LIBDIR to the `LD_RUN_PATH' environment variable
     during linking
   - use the `-Wl,-rpath -Wl,LIBDIR' linker flag
   - have your system administrator add LIBDIR to `/etc/ld.so.conf'

See any operating system documentation about shared libraries for
more information, such as the ld(1) and ld.so(8) manual pages.
----------------------------------------------------------------------

Documentation

Documentation is uploaded to ReadTheDocs. You can also build the documentation yourself using sphinx.

Usage

To use a peripheral, for example GPIO, you need to include the corresponding header into your program. #include <mipea/gpio.h>

After that it is crucial to map the peripheral like so gpio_map(). When your program is finished you should unmap the peripheral again gpio_unmap() Now you can use the registers or the provided functions.

Compile and link

gcc -Wall -o [outputfile] [your program].c -lmipea

Servos

Although you can drive one or two servos using this library and PWM it is now possible to drive more. You could of course use usleep() but this is not recommended, as it is not very accurate. Instead you could use my mipea_servo library which makes use of DMA and PWM to archieve a very accurate pulse without CPU usage.

Sources and useful documentation