TheBackShed.com

Forum Index : Microcontroller and PC projects : Installing from MPLAB

Author

Message

haiqu

Senior Member

Joined: 30/07/2011
Location: Australia
Posts: 152

Posted: 08:03pm 30 Aug 2011

Copy link to clipboard

Print this post

Hi,

I've got a weird thing going on here. The two boards I just built won't run when I install the MMBasic v2.1 with bootloader, but when I install 2.11BSD they're fine. Is there some trick to burning these with MPLAB, or is the bootloader buggy, or what?

There was some talk of the need for a very low ESR cap a while ago, is this what I'm experiencing? I used standard electros because I've had problems with tantalums shorting out over the years, and the 100n caps are all ceramics.

Rob

unzip, strip, touch, finger, grep, mount, fsck, more, yes, fsck, fsck, fsck, umount, sleep

donmck

Guru

Joined: 09/06/2011
Location: Australia
Posts: 1313

Posted: 08:29pm 30 Aug 2011

Copy link to clipboard

Print this post

Just check what Stuart Smith did to get his to run:

http://www.thebackshed.com/forum/forum_posts.asp?TID=3550&PN =7

Why there should be any difference between MMBasic v2.1 and 2.11BSD is beyond me.

I recently burnt "MMBasic v2.1 with bootloader" using Microchip's "PICkit 3.exe" which is available from their web site, on the Pikit3 page.

Two options anyway before you lose all your hair.

Cheers Don...

(Oh, that is if you have a PICKIT 3 kit of course)Edited by donmck 2011-09-01

https://www.dontronics.com

aargee
Senior Member

Joined: 21/08/2008
Location: Australia
Posts: 255

Posted: 10:32pm 30 Aug 2011

Copy link to clipboard

Print this post

Rob,

You could have a look at my page here to see what I did with the capacitor. The original capacitor has now been replaced by a SMD Tantalum type and works fine, although I can't imagine why the BSD worked and MM didn't. It could be something to do with programming switches when the Maximite is loaded that affects the clock circuit and makes this capacitor selection a bit more sensitive?

When I programmed, I just used the Pickit3, set the PIC destination, loaded the 2.1/Bootloader hex file and away it went. (well after the cap mod it did!!)

- Rob

For crying out loud, all I wanted to do was flash this blasted LED.

haiqu

Senior Member

Joined: 30/07/2011
Location: Australia
Posts: 152

Posted: 02:35am 31 Aug 2011

Copy link to clipboard

Print this post

Yup, a 47u/16v electro between Vcap and Vdd brought both of them to life. Thank you linesmen, thank you ballboys.

The fact that BSD worked tells me there's a firmware fix that can be applied. Pity the code isn't available for the bootloader.

Rob

unzip, strip, touch, finger, grep, mount, fsck, more, yes, fsck, fsck, fsck, umount, sleep

donmck

Guru

Joined: 09/06/2011
Location: Australia
Posts: 1313

Posted: 03:13am 31 Aug 2011

Copy link to clipboard

Print this post

haiqu said Yup, a 47u/16v electro between Vcap and Vdd brought both of them to life. Thank you linesmen, thank you ballboys.

The fact that BSD worked tells me there's a firmware fix that can be applied. Pity the code isn't available for the bootloader.

Rob

Great!

Some one will either know, or work out the answer to that one eventually.

Cheers Don...

https://www.dontronics.com

Print this page

To reply to this topic, you need to log in.