Ecosyste.ms: Awesome

An open API service indexing awesome lists of open source software.

Awesome Lists | Featured Topics | Projects

https://github.com/mmitch/signallichtpwm

moodlight color-float software for Signal Board / Signal Licht hardware
https://github.com/mmitch/signallichtpwm

Last synced: 5 days ago
JSON representation

moodlight color-float software for Signal Board / Signal Licht hardware

Awesome Lists containing this project

README 

        

signalLichtPWM

moodlight color-float software for Signal Board / Signal Licht hardware



Copyright (C) 2012 by  Christian Garbs 

licensed under the GNU GPL v3 or later



0xff quickstart

===============



1) connect Signal Board + Signal Licht via USB

2) reset Signal Board

3) $ make pwm-licht-3.flash

4) enjoy



0x00 contents

=============



  1 - motivation

  2 - usage

  3 - status

  4 - links



0x01 motivation

===============



Members of the Chaos Computer Club Hannover Leitstelle 511 e.V. have

created a small modular ATmega developmend board.  It consists of a

base board (the Signal Board) which contains the ATmega168 processor,

a USB port for power and programming, a reset button and some

connectors.  Different shields for different funtions can be stacked

onto the base board.



Currently, only Signal Licht is finished: It contains some LEDs and

can be used as a moodlight.



Both Signal Board and Signal Licht can be purchased at the C3H, but

there is one problem:  The official moodlight software is not finished

yet, so basically when you get your Signal Board and Signal Licht, it

does not do much.



This is where signalLichtPWM comes in: It provides a moodlight

functionality.



It also doubles as a way of showing how to use interrupts and to do

software PWM (only two colors on Signal Licht can be controlled

directly via ATmega hardware counters, the third color must be

controlled manually).



0x02 usage

==========



I expanded the Makefile to automatically compile and flash any C

source in the current directory.



To compile and flash "pwm-licht-3.c", just do



$ make pwm-licht-3.flash



This requires that the Signal Board is in programming mode (after

having pressed reset) and connected to your PC via USB.



Of course, you need the AVR cross compiling toolchain and correct

permissions to access the USB device, see the Signal Board project

homepage for info on this.



On Debian/Ubuntu, at least 'avr-libc', 'avrdude' and 'gcc-avr' are

needed.



0x03 status

===========



The C code works and is finished.  It is shown in different

development states to make it easier to learn and understand what's

done:



pwm-licht-1.c    dims blue + green LEDs to different levels

pwm-licht-2.c    slowly changes blue + green brightness

pwm-licht-3.c    complete moodlight with all three colors



I also tried to teach myself some AVR assembler and convert the C code

above to assembler:



pwm-licht-1.S    proven(?) working inside AVR Studio 4 debugger

pwm-licht-2.S    conversion not finished yet

pwm-licht-3.S    conversion not started yet



My main problem is that AVR Studio 4 and avr-as don't seem to expect

the same source code / assembler dialect.  I simply don't get my

assembler code to compile directly under Linux, only in AVR Studio.

I have not yet tried to write a binary generated by AVR Studio to my

Signal Board, so everything has only been tested inside the debugger.



If anybody can help on this assembler issue, please contact me.  And

if anybody is interested in the AVR Studio projects, I can add them to

this repository (if I still find them, that was years ago…).



0x04 links

==========



* signalLichtPWM homepage:

  https://github.com/mmitch/signalLichtPWM



* Signal Board project homepage:

  https://hannover.ccc.de/redmine/projects/signalboard/wiki  



* Signal Licht project homepage:

  https://hannover.ccc.de/redmine/projects/signallicht/wiki



* C3H homepage

  https://hannover.ccc.de



* a photo of my Signal Sound prototype, a different shield for making

  music (mostly software problems remain, the hardware works):

  https://www.cgarbs.de/blog/archives/1037-Hacking-Warpzone.html