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Add Arduino compatibility layer

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We can now directly compile arduino sketches (.pde) files.
Arduino compatible analogWrite works now.
But there is still a long way to go, serial I/O and timer stuff (delay,
millis etc) currently don't work (not tested but I don't expect this to
work).
It can be used in an arduino sketch or in a normal contiki program.
We get a PWM frequency of 490.2 Hz (a period of 2.040 ms), that's
Arduino compatible. If you need different frequencies see native timer
usage in examples/osd/pwm-example
In a contiki program you have to call arduino_pwm_timer_init to
initialize the timer before pwm works. The arduino sketch wrapper
already does this.
For running a sketch, see examples/osd/arduino-sketch
This commit is contained in:
Ralf Schlatterbeck 2014-06-26 11:00:01 +02:00
parent b17934c491
commit b6be226e69
22 changed files with 999 additions and 361 deletions
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apps/arduino/README.md Normal file
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Arduino Compatibility
=====================
This application contains hardware-independent implementations of
arduino compatibilty libraries and include files to be used with
contiki.
The whole arduino compatibility library is work in progress. Note that
features having to do with timers like `millis` and `delay` are
currently untested. In Arduino they use timer 0 of the AVR
microcontroller. It should be investigated to use the hardware timer
already in use by contiki (on the OSD-merkur platform this is currently
timer 5).