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by jum
Tue Dec 20, 2016 3:31 pm
Forum: Graphics, sound and multimedia
Topic: RPi Synthesizer Project
Replies: 11
Views: 2918

Re: RPi Synthesizer Project

Too much information! :) So many good ideas. Looking forward to seeing the finished synths. Have spent some hours over the last few days trying to finish my prototype case. See attached photos. Will make a video of the thing in action if I get the chance over the next few weeks. Edit: Here's the vid...
by jum
Wed Dec 14, 2016 8:03 am
Forum: Graphics, sound and multimedia
Topic: RPi Synthesizer Project
Replies: 11
Views: 2918

Re: RPi Synthesizer Project

@TonyD - Thanks for the link to the Rpi UART MIDI setup - very interesting. I assume you built some sort of MIDI IN to GPIO interface. @IanS - Wow that looks super cool. Those panels must have taken a lot of work! How do they communicate with the RPi(s)? The wooden "bookends" on your keybed are very...
by jum
Tue Dec 13, 2016 9:40 am
Forum: C/C++
Topic: SDL2 touch event handling
Replies: 2
Views: 1758

Re: SDL2 touch event handling

I am also trying to get touch events working in SDL2 on RPi (with offical 7" touch screen), without success (SDL_FINGERDOWN events are not detected). Perhaps this is not supported in the version of SDL2 on the RPi. I notice there are touch functions in SDL2.0.4 that are missing from my SDL2 installa...
by jum
Fri Dec 09, 2016 8:13 pm
Forum: Graphics, sound and multimedia
Topic: RPi Synthesizer Project
Replies: 11
Views: 2918

Re: RPi Synthesizer Project

No. I'm making something a lot more portable. The RPi is attached to the back of the 7" touchscreen, both will be housed in a wooden case roughly 220x130x45mm. This "screen box" will be mounted on a swivel pole which is fixed near the back of the main keyboard unit. Keyboard unit will be wood for re...
by jum
Thu Dec 08, 2016 12:07 pm
Forum: Graphics, sound and multimedia
Topic: RPi Synthesizer Project
Replies: 11
Views: 2918

Re: RPi Synthesizer Project

Hi Ian, thanks for you insight. I have tried to minimise latency. The code is all C++, the audio buffer size is small as possible, and the synth engine has a thread which reads MIDI on/off directly from /dev/midi. Initially the latency was quite bad, until I adjusted the audio buffer size. Now I wou...
by jum
Thu Dec 08, 2016 10:39 am
Forum: Graphics, sound and multimedia
Topic: RPi Synthesizer Project
Replies: 11
Views: 2918

RPi Synthesizer Project

https://github.com/james7780/synth/ The aim of this project is to build a "self-contained" synthesizer workstation using a RPi 2, a touchscreen LCD display and a MIDI keyboard. The github above holds the source code for the project, which is split into 2 modules: "Synth Engine" - the process which r...
by jum
Thu Sep 24, 2015 7:17 pm
Forum: Bare metal, Assembly language
Topic: Circle - C++ bare metal environment (with USB)
Replies: 120
Views: 30751

Re: Circle - C++ bare metal environment (with USB)

Thanks rst for the feedback and the tip about uboot. I will try the empty PREFIX= thing and let you know. PS: jspeccy thanks for the info about the modified bootloader. I have been using uboot to upload a test executable via FTDI serial (using uboot "loady" command, then "go" command), but the test ...
by jum
Tue Sep 22, 2015 7:23 pm
Forum: Bare metal, Assembly language
Topic: Circle - C++ bare metal environment (with USB)
Replies: 120
Views: 30751

Re: Circle - C++ bare metal environment (with USB)

First of all, thanks for this great work :) I want to share how I managed to build Circle on the Raspberry Pi (in case other people are also trying to do this). The reason you might want to do this is because you want to write and build Circle apps on your RPi, rather than installing a cross-compile...
by jum
Fri Jan 10, 2014 2:30 pm
Forum: Bare metal, Assembly language
Topic: Raspberry Pi OS
Replies: 82
Views: 16788

Re: Raspberry Pi OS

Would be cool to be able to write and run the DexBasic programs while in DexOS. (old-school 8-bit computer style).
by jum
Mon Nov 25, 2013 2:35 pm
Forum: Camera board
Topic: Motion - MMAL camera
Replies: 471
Views: 350629

Re: Motion - MMAL camera

To get mmal-motion to autostart, I added "/home/pi/motion -n -c /home/pi/motion-mmalcam.conf" to /etc/rc.local Did you really use the "-n" switch (non-daemon mode)? Probably not, but if I am using the -n switch, it won't make any difference on my Pi-cam setup since my 2 Pi-cams are running headless...
by jum
Mon Nov 18, 2013 9:04 am
Forum: Camera board
Topic: Motion - MMAL camera
Replies: 471
Views: 350629

Re: Motion - MMAL camera

IIRC, the "normal" motion uses /etc/default/motion file to specify whether motion should be started at boot, but this isn't going to work for the mmal-motion "install". To get mmal-motion to autostart, I added "/home/pi/motion -n -c /home/pi/motion-mmalcam.conf" to /etc/rc.local (obviously if your m...
by jum
Fri Jul 19, 2013 5:20 pm
Forum: Camera board
Topic: Motion - MMAL camera
Replies: 471
Views: 350629

Re: Motion - MMAL camera

I've also noticed that the RPi power LED and the camera board LED both dim when a picture is being taken, even if I use a "2 amp" USB power supply. (Also get some slight horizontal banding in the pictures taken). In case anyone else is getting the "horizontal banding" problem, I fixed it by using a...
by jum
Fri Jun 07, 2013 8:20 pm
Forum: Beginners
Topic: Playstation PS3 Eye Streaming
Replies: 65
Views: 105513

Re: Playstation PS3 Eye Streaming

IXL wrote:This looks awesome...

What do I need to get this running from boot?

Any help would be appreciated. :D
Yes it is pretty awesome :)

To get motion to run as a daemon when you boot up your RPi, edit /etc/default/motion and change the "no" to a "yes".

Also, try "man motion"
by jum
Mon Jun 03, 2013 10:30 am
Forum: Camera board
Topic: Motion - MMAL camera
Replies: 471
Views: 350629

Re: Motion - MMAL camera

dozencrows wrote:A note on image resolution...

Currently, only certain resolutions work. My personal testing has shown the following work:
  • 352x288
  • 640x480
  • 1024x576
512 x 288 also works and seems to use little CPU.
by jum
Sun Jun 02, 2013 3:41 pm
Forum: Camera board
Topic: Motion - MMAL camera
Replies: 471
Views: 350629

Re: Motion - MMAL camera

As an suggetion try dropping the resolution down to 768x576 (or 640x480) and see if its a bit more stable. I had mine up high to start with but I found it very slow to do anything else on the machine. Overclocking might be your friend if its more stable at the lower resolution. Thanks craigc - I ha...
by jum
Thu May 30, 2013 1:15 pm
Forum: Camera board
Topic: Motion - MMAL camera
Replies: 471
Views: 350629

Re: Motion - MMAL camera

Hi dozencrows, thanks for adding rpi camera support to motion. It partially works for me, runs for about 30 seconds (captures pictures at the default .conf resolution of 1024 x 576) and then freezes the RPi. I can start another terminal session (Ctrl-Alt-F2), run "top", see the CPU usage is quite hi...
by jum
Thu Mar 28, 2013 9:51 am
Forum: Bare metal, Assembly language
Topic: Raspbery Pi Forth Operating System
Replies: 31
Views: 20764

Re: Raspbery Pi Forth Operating System

Nice work Roland. (I copied some/most of your rpiBoot files to one of my Raspbian SD cards to test it). ... Nowadays I am considering experimenting with bare metal Forths on the RPi and am very interesting in using your code and/or assisting you if possible. I am particularly interested in the bares...
by jum
Wed Mar 20, 2013 2:32 pm
Forum: Bare metal, Assembly language
Topic: Raspbery Pi Forth Operating System
Replies: 31
Views: 20764

Re: Raspbery Pi Forth Operating System

Nice pilotrk, I love Forth, will try your RPi Forth soonest.

I was considering trying to port a very simple Forth I made for the Playstation 1 to RPi, but was put off because I don't know ARM assembly code (PS1 was MIPS code).
.
by jum
Wed Mar 20, 2013 12:46 pm
Forum: Gaming
Topic: Jum52 Atari 5200 Emulator
Replies: 0
Views: 806

Jum52 Atari 5200 Emulator

Attached is an initial port of my Atari 5200 emulator "Jum52" version 1.1 to Raspberry Pi: Update: Use the link below, forum only allows 64kb attachment (boo!): http://github.com/james7780/jum52/raw/master/driver_Raspbian_SDL/Jum52_RPi.tar Make a subfolder in your home directory called "Jum52", copy...

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