electro-music.com   Dedicated to experimental electro-acoustic
and electronic music
 
    Front Page  |  Articles  |  Radio
 |  Media  |  Forum  |  Wiki  |  Links  |  Store
Forum with support of Syndicator RSS
 FAQFAQ   CalendarCalendar   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   LinksLinks
 RegisterRegister   ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in  Chat RoomChat Room 
go to the radio page Live at electro-music.com radio 1 Please visit the chat
poster
 Forum index » DIY Hardware and Software » Microcontrollers and Programmable Logic
The Circular Clock Divider
Post new topic   Reply to topic Moderators: State Machine
Page 1 of 1 [15 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
Author Message
fvsr



Joined: Mar 05, 2014
Posts: 7
Location: Brazil

PostPosted: Fri Jan 08, 2016 8:17 pm    Post subject: The Circular Clock Divider
Subject description: a DIY open source PIC based electronic project
Reply with quote  Mark this post and the followings unread

Hi
The Circular Clock Divider is a simple projet which I made the hardware and firmware from scratch, inspired from other projects that are alredy in the market. Its an open source PIC based electronic project which you can, with some basic skills in electronics, build, use and modify at will.
If you want to produce polyrythms and interesting rythmic constructions, you may look at this project, since it can, using a single stream of pulses, produce eight different output frequencies of pulses, based in eight different dividers, plus the clock output, and you can change the dividers all the time.
The schematic:
Posted Image, might have been reduced in size. Click Image to view fullscreen.
Features:300us response delay, up to 2KHz working frequency, 8 different output frequencies all the time, 256 interchangeable dividers arrays, trigger/gate, up beat/down beat, spread, auto-reset and manual reset modes.
Some of signals that the Circular Clock Divider can generate, captured by a logic analyzer:
Trigger and down beat modes:
Posted Image, might have been reduced in size. Click Image to view fullscreen.
Trigger and up beat modes:
Posted Image, might have been reduced in size. Click Image to view fullscreen.
Gate and down beat modes
Posted Image, might have been reduced in size. Click Image to view fullscreen.
Gate and up beat modes
Posted Image, might have been reduced in size. Click Image to view fullscreen.
Trigger and down beat modes are selected, circulate potentiometer is turned right to increase the voltage. The divisors potentiometer was allways at 0V. The divisors array changed from {1,2,3,4,5,6,7,8}, to {2,3,4,5,6,7,8,1}, {3,4,5,6,7,8,1,2}, {4,5,6,7,8,1,2,3}, {5,6,7,8,1,2,3,4}, {6,7,8,1,2,3,4,5}, {7,8,1,2,3,4,5,6}, {8,1,2,3,4,5,6,7}.
Posted Image, might have been reduced in size. Click Image to view fullscreen.
Trigger and down beat modes are selected, divisors potentiometer is turned right to increase the voltage. The divisors array changed from {1,2,3,4,5,6,7,8} to {9,10,11,12,13,14,15,16}, after a reset. The circulate potentiometer was allways at 0V. The first track is the clock output (comparator output) in order to maintain a reference.
Posted Image, might have been reduced in size. Click Image to view fullscreen.
The link to the Word Press blog is here:
https://mcuprojectsblog.wordpress.com/2015/12/27/the-circular-clock-divider-v-1/
I think the project is well documented, but let me know if someone needs more information. I will adapt the code for at least three different microcontroller models, so the part will not be a problem. I hope someone get encouraged to build the prototype and live a coment.
Best regards.[/img]

Last edited by fvsr on Tue Jan 19, 2016 1:50 am; edited 2 times in total
Back to top
View user's profile Send private message
LFLab



Joined: Dec 17, 2009
Posts: 495
Location: Rosmalen, Netherlands

PostPosted: Sat Jan 09, 2016 1:37 pm    Post subject: Reply with quote  Mark this post and the followings unread

Interesting! I was planning on doing something similar in Arduino, will look into your project for clues!
Back to top
View user's profile Send private message
fvsr



Joined: Mar 05, 2014
Posts: 7
Location: Brazil

PostPosted: Sat Jan 09, 2016 2:09 pm    Post subject: Reply with quote  Mark this post and the followings unread

LFLab wrote:
Interesting! I was planning on doing something similar in Arduino, will look into your project for clues!

Hi, I'm glad you found it interesting, be my guest to use any information at the blog. It would be nice if you could post some of your results here.
Back to top
View user's profile Send private message
1_over_f_noise



Joined: Mar 14, 2010
Posts: 10
Location: Italy

PostPosted: Thu Jan 14, 2016 11:18 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi fvsr,

very interesting device!

I would like try it in the easy way, but when I go on your blog and I try to download the .hex version, my browser don't allow me of doing it caused by an security warning.
What I have mistaken?
Back to top
View user's profile Send private message
fvsr



Joined: Mar 05, 2014
Posts: 7
Location: Brazil

PostPosted: Fri Jan 15, 2016 6:02 am    Post subject: Reply with quote  Mark this post and the followings unread

1_over_f_noise wrote:
but when I go on your blog and I try to download the .hex version, my browser don't allow me of doing it caused by an security warning.
What I have mistaken?


Sorry about that, and thanks for the warning.
I have changed all links at the blog to Google Drive sharing links, and I think the problem is solved now. If you have any other problems let me know.
If you could post your results here it would be nice.
Back to top
View user's profile Send private message
dougseidel



Joined: Feb 10, 2010
Posts: 74
Location: NJ

PostPosted: Fri Jan 15, 2016 6:25 am    Post subject: Reply with quote  Mark this post and the followings unread

That looks totally cool!
Thanks for designing!

_________________
http://soundcloud.com/douglasmseidel
Back to top
View user's profile Send private message Visit poster's website
1_over_f_noise



Joined: Mar 14, 2010
Posts: 10
Location: Italy

PostPosted: Sun Jan 17, 2016 5:13 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi there!

Thank you for your very kind and fast answer!
Problem fixed!
I succesfully downloaded your file .hex!

I'll try to use the MikroProg Programmer (by MikroE) in order to upload it on the PIC (that I have to buy...).
As soon as possible, I'll try to put on breadboard your extremely interesting project and of course I'll post every result!
Back to top
View user's profile Send private message
fvsr



Joined: Mar 05, 2014
Posts: 7
Location: Brazil

PostPosted: Sun Jan 17, 2016 12:03 pm    Post subject: Reply with quote  Mark this post and the followings unread

1_over_f_noise wrote:

Problem fixed!
I succesfully downloaded your file .hex!


I'm glad that the problem is solved! I think Goggle provides a stable service.

1_over_f_noise wrote:

I'll try to use the MikroProg Programmer (by MikroE) in order to upload it on the PIC


I think MikroProg Programmer is a good choice. I have EasyPIC v7, and it is so well made, works very well. It must be better than Microchip's PICkit 3 (the little red), which is a big problem, mostly because its software is crap.
At the MikroProg's page you can see a list of supported devices, and PIC18F26K22 is there.
Remember that the crystal's frequency must be 16MHz or lower, to get 64MHz (in x4 PLL mode), the maximum operating frequency for PIC18F26K22.

1_over_f_noise wrote:

(that I have to buy...)


I'm reviewing the code for PIC18F2520, with wich I have already running this project, and soon I will post it. I think that PIC18F4520 must be easier to find.

1_over_f_noise wrote:

As soon as possible, I'll try to put on breadboard your extremely interesting project and of course I'll post every result!


I am looking forward to see your results, good luck!
Back to top
View user's profile Send private message
1_over_f_noise



Joined: Mar 14, 2010
Posts: 10
Location: Italy

PostPosted: Tue Jan 19, 2016 9:49 am    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
I think MikroProg Programmer is a good choice. I have EasyPIC v7, and it is so well made, works very well. It must be better than Microchip's PICkit 3 (the little red), which is a big problem, mostly because its software is crap.
At the MikroProg's page you can see a list of supported devices, and PIC18F26K22 is there.
Remember that the crystal's frequency must be 16MHz or lower, to get 64MHz (in x4 PLL mode), the maximum operating frequency for PIC18F26K22.


Thanks vey much for the hints, I'm on my way to order the PIC18F26K22!

Quote:

I am looking forward to see your results, good luck!


Thanks... When ready, I'll try to regularly post every step concerning your project in order to share technical and musical results! Very Happy
Back to top
View user's profile Send private message
fvsr



Joined: Mar 05, 2014
Posts: 7
Location: Brazil

PostPosted: Mon Feb 01, 2016 6:08 am    Post subject: Migrating CCM code to PIC18F2520 Reply with quote  Mark this post and the followings unread

Hi!

Here yo can find the modified code for the Circular Clock Divider, which runs in the PIC18F2520:
https://drive.google.com/file/d/0B-rXtCmRkuoDWE0tazMtSFoxMUE/view?usp=sharing
And here some more information about this adaptation:
https://mcuprojectsblog.wordpress.com/2016/02/01/the-circular-clock-divider-v-1-pic18f2520/
Back to top
View user's profile Send private message
Paradigm X



Joined: Feb 15, 2011
Posts: 363
Location: Null and void
Audio files: 2

PostPosted: Mon Feb 01, 2016 9:51 am    Post subject: Reply with quote  Mark this post and the followings unread

hey this is perfect, just what i was looking for. I even have the correct pIC chip!

Great project!

Are you planning on making any PCBs for this?

Many thanks, BEn
Back to top
View user's profile Send private message
fvsr



Joined: Mar 05, 2014
Posts: 7
Location: Brazil

PostPosted: Mon Feb 01, 2016 5:32 pm    Post subject: Reply with quote  Mark this post and the followings unread

Paradigm X wrote:
hey this is perfect, just what i was looking for. I even have the correct pIC chip!


Hi! I`m glad you liked it.
One of the guidelines of this project is that it must have features of another project already in production. And it ended up being "migratable" to other 28 pins MCUs. Maybe I'll write code for PIC18F2550, which I think is also very easy to obtain.

Paradigm X wrote:
Great project!


Thanks. I hope you can build it with almost no difficulties. In case you manage to build it, it'd be awesome if could post some results or reviews.

Paradigm X wrote:
Are you planning on making any PCBs for this?


For now I`m waiting the project to mature itself through possible future community contributions, and/or other code revisions and/or migrations. Some change in the hardware may be necessary.

Paradigm X wrote:
Many thanks, BEn


Enjoy!
Back to top
View user's profile Send private message
Paradigm X



Joined: Feb 15, 2011
Posts: 363
Location: Null and void
Audio files: 2

PostPosted: Tue Feb 02, 2016 2:54 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi

Im not very good at stripboard layouts etc unfortunately, although i might give it a go.

If i do i will certainly post here.

For the price of ten pcbs from itead or seeed i might suggest its worth getting some pcbs done now, and maybe more another time? I paid like £10 for 10 pcbs, including shipping. I would be happy to pay for a run and send you them if youre interested?

Was funny, ive been trying to work out how best to do the 'down beat' mode for a while, and youve cracked it!

Cheers
Ben
Back to top
View user's profile Send private message
fvsr



Joined: Mar 05, 2014
Posts: 7
Location: Brazil

PostPosted: Tue Feb 02, 2016 5:24 am    Post subject: Reply with quote  Mark this post and the followings unread

Paradigm X wrote:

Was funny, ive been trying to work out how best to do the 'down beat' mode for a while, and youve cracked it!


It's like this:

The remain equation is z = x % y.
For example, if x=7 and y=3, then 7/3=2 and z=1, the remain is 1.

If x>y, then z = remain;
If x=y, or x is multiple of y, z must be 0;
If x is less than y, then z=x;
If x=0 and y>0, then x<y, then z=x=0, for any given y.

At the first beat all counters are = 1. If I do like this
x = (counter - 1) % divisor
x will be zero for all counters, then z will be 0 for any given divisor,
voilà, down beat!

Paradigm X wrote:
For the price of ten pcbs from itead or seeed i might suggest its worth getting some pcbs done now, and maybe more another time? I paid like £10 for 10 pcbs, including shipping. I would be happy to pay for a run and send you them if youre interested?


I didn't even begin to make the Eagle project, but thanks anyway, maybe latter?

Last edited by fvsr on Wed Feb 03, 2016 5:23 am; edited 3 times in total
Back to top
View user's profile Send private message
Paradigm X



Joined: Feb 15, 2011
Posts: 363
Location: Null and void
Audio files: 2

PostPosted: Tue Feb 02, 2016 5:43 am    Post subject: Reply with quote  Mark this post and the followings unread

Voila indeed!

Cool - sorry, i had assumed it was ready to go as you'd done the schematic.

Sorry, not trying to rush you Wink

I might have a go at breadboarding/stripboarding it.

Many thanks
Ben
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic Moderators: State Machine
Page 1 of 1 [15 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
 Forum index » DIY Hardware and Software » Microcontrollers and Programmable Logic
Jump to:  

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


Forum with support of Syndicator RSS
Powered by phpBB © 2001, 2005 phpBB Group
Copyright © 2003 through 2009 by electro-music.com - Conditions Of Use