RetroBSD

2.11BSD operating system for microcontrollers
It is currently Wed Jun 03, 2020 7:21 pm

All times are UTC




Post new topic Reply to topic  [ 192 posts ]  Go to page Previous  1 ... 6, 7, 8, 9, 10
Author Message
PostPosted: Thu Oct 22, 2015 2:25 pm 

Joined: Mon Nov 24, 2014 1:07 pm
Posts: 58
Hi Pito,

That's exactly why I think this board isn't going to work the way it is. Personally I don't think the board underwent enough testing at Olimex before it was released otherwise the problem would have been seen. I'm tempted to send an email to the guys at Olimex and moan about it, just on the off chance that they offer a replacement board. I think the newer version of the board doesn't have this issue.

If I only had more time to tinker with it and jerry rig an external osc! I don't even have one I could try in my component drawers, grrr!!

Dan


Top
 Profile  
 
PostPosted: Fri Oct 23, 2015 6:06 am 

Joined: Sun Dec 07, 2014 1:47 am
Posts: 22
Can anyone confirm later revs of the Olimex board fix that issue? I'm gonna need something cool to sit at work on my desk next to the BSD/OS tape. ;)


Top
 Profile  
 
PostPosted: Fri Oct 23, 2015 6:15 am 
Committer
User avatar

Joined: Wed Oct 10, 2012 11:01 pm
Posts: 1081
Location: Sunnyvale, CA
Well, JMZ144 works pretty stable for me, but may be I'm just lucky.

An alternative variant is a SnadPIC MZ board.


Top
 Profile  
 
PostPosted: Fri Oct 23, 2015 10:38 am 
Contributor
User avatar

Joined: Thu Nov 08, 2012 7:04 am
Posts: 2401
Location: Rapa Nui
gewtnet wrote:
Can anyone confirm later revs of the Olimex board fix that issue?

This is the late 2014 rev A5 errata - and how to fix the oscillator issue with A5, it may help with A4 too.
Solder in the 10kohm resistor to help oscillator start ..
Also I've seen somewhere you should not use the logic pins close to oscillator pins as they can disturb the oscillator when toggled..
Errata also says you
1. cannot use ceramic resonator for primary oscillator,
2. cannot use crystal for the secondary oscillator.
PS: As the MCHP erratas are probably written by none-technical staff - the "crystal oscillator" here means "the crystal". "External clock" means "external crystal oscillator" or any other kind of an external oscillator with appropriate output level and timing..
Attachment:
primosc.JPG
primosc.JPG [ 33.67 KiB | Viewed 20577 times ]

Attachment:
errata 2015.JPG
errata 2015.JPG [ 174.56 KiB | Viewed 20579 times ]

_________________
Pukao Hats Cleaning Services Ltd.


Top
 Profile  
 
PostPosted: Sat Oct 24, 2015 6:03 am 
Contributor

Joined: Mon Nov 12, 2012 1:34 pm
Posts: 1092
Hi Serge,

SnadPIC board looks rather interesting as an MZ...EF device..

It would seem that flashing it and putting in a LiteBSD microSD would make a pretty simple basic LiteBSD system?

Have you tried one out [yet]?

What are you using for MZ...EF devices right now and which do you recommend? Other comments also please?

I gotta join the party.

Wiz


Top
 Profile  
 
PostPosted: Tue Oct 27, 2015 7:26 am 
Committer
User avatar

Joined: Wed Oct 10, 2012 11:01 pm
Posts: 1081
Location: Sunnyvale, CA
Hi Wiz,

Yes, I have a couple of SnadPIC boards: one with MZ processor (not EF though), and another one with MX795. Both work pretty well See the pictures below. Kernel cofiguration for LiteBSD is still under development.

Image

Image

--Serge


Top
 Profile  
 
PostPosted: Mon Nov 02, 2015 2:42 am 

Joined: Sun Dec 07, 2014 1:47 am
Posts: 22
Ordered a SnadPIC MZ...EF board.

Here's hoping ethernet is simple enough to get going (a long with additional memory later on? ;) )


Top
 Profile  
 
PostPosted: Mon Nov 02, 2015 6:20 am 
Committer
User avatar

Joined: Wed Oct 10, 2012 11:01 pm
Posts: 1081
Location: Sunnyvale, CA
You can find a kernel configuration for the SnadPIC MZ board here: https://github.com/sergev/LiteBSD/blob/master/sys/mips/conf/SNADPIC.pic32

For Ethernet, just add one line:
Code:
controller      en0

External memory would require more work.


Top
 Profile  
 
PostPosted: Mon Nov 02, 2015 7:45 pm 
Committer
User avatar

Joined: Wed Oct 10, 2012 11:01 pm
Posts: 1081
Location: Sunnyvale, CA
LiteBSD binaries for the SnadPIC MZ board are available for download on the autobuild page: http://litebsd.org/wiki/autobuild.php


Top
 Profile  
 
PostPosted: Wed Nov 04, 2015 10:11 am 

Joined: Mon Nov 24, 2014 1:07 pm
Posts: 58
Yay!! I've finally got my HMZ144 board to run properly. It would seem that it dislikes running from a USB power source of any kind, but connect a Li Ion 500mAh battery to it and hey presto it boots and runs like a charm!

Now to design and create a motherboard with an ethernet switch and an LCD header and bluetooth for keyboard IO.

Thanks everyone for all your help and suggestions, it helped to narrow down what the issue was. I think my not so great DSO probes were loading the crystal and killing it, hence why I thought the crystal was the issue. As it happens the small mod on the board that Olimex had done was to correct for that problem as listed in the silicon errata that pito pointed out.

Good times ahead, I hope!

Dan


Top
 Profile  
 
PostPosted: Thu Jan 28, 2016 2:42 am 

Joined: Sun Dec 07, 2014 1:47 am
Posts: 22
gewtnet wrote:
Ordered a SnadPIC MZ...EF board.

Here's hoping ethernet is simple enough to get going (a long with additional memory later on? ;) )


Is using a 3.3V -> TTL adapter for programming required? I can't get it to show up to anything via USB...would be nice if a manual existed.


Top
 Profile  
 
PostPosted: Sun Jan 31, 2016 8:30 pm 

Joined: Sun Dec 07, 2014 1:47 am
Posts: 22
gewtnet wrote:
gewtnet wrote:
Ordered a SnadPIC MZ...EF board.

Here's hoping ethernet is simple enough to get going (a long with additional memory later on? ;) )


Is using a 3.3V -> TTL adapter for programming required? I can't get it to show up to anything via USB...would be nice if a manual existed.


It appears the MZ...EF board is slightly ... different in how it behaves. (It is very eager to operate differently connected to USB than connected to DC...such as operating as a USB HUB(!))


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 192 posts ]  Go to page Previous  1 ... 6, 7, 8, 9, 10

All times are UTC


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 post attachments in this forum

Search for:
cron




Powered by phpBB® Forum Software © phpBB Group

BSD Daemon used with permission