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M1284P Odd Reset Issue
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rkumetz

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Joined: 23 Jan 2007
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Location: Vermont

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PostPosted: Tue May 12, 2020 9:59 pm    Post subject: Reply with quote

albertsm wrote:
you best contact microchip about it. this is a hardware problem, not related to the code or bascom-AVR
The errata does not show a problem but that does not mean much.
The problem could be caused by a combination of conditions.


I agree.

Atmel has never had great support in the US but I am sure that having been purchased by Microchip it will be worse.
Microchip loves to have an intern or fresh out of school person read to you from the same PDF files that you can find on the web page.
That is much cheaper than having experienced engineers doing support.

Microchip would do well to pay attention to the support that MCS provides! :D
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Dave

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PostPosted: Wed May 13, 2020 12:34 am    Post subject: Reply with quote

Is your board connected to a com port? I've seen this sort of thing happen when a project is connected to a usb to ttl converter. The converter can supply just enough power so uC never completely powers off and so doen't reset.
I'm using three pin power on reset chips in current projects they provide a much more solid reset.
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albertsm

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PostPosted: Wed May 13, 2020 8:44 am    Post subject: Reply with quote

atmel support has been good. I got samples, the docs were ok, emails i sent were handled. But in am in the EU.
what was always clear is that their main interest is selling chips. The software they probably see as a necessary evil.

With microchip the docs are still good. but indeed support seems worse.
The docs while good have been changed a lot. some chip packages are gone, then some chips are bundled different, but these are new chips so i guess that is what you get when working with preliminary sheets.
i have a lot of problems to get some sample chips. some i ordered never came. but can be that they change packages. now i usually wait till farnell sells them.

In any case, it is best to inform microchip. i also open a case for all problems i find in the datasheet/inc files. if nobody informs them they can not correct it.

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rkumetz

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Joined: 23 Jan 2007
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PostPosted: Wed May 13, 2020 2:08 pm    Post subject: Reply with quote

Dave wrote:
Is your board connected to a com port? I've seen this sort of thing happen when a project is connected to a usb to ttl converter. The converter can supply just enough power so uC never completely powers off and so doen't reset.
I'm using three pin power on reset chips in current projects they provide a much more solid reset.


The answer to this is both yes and no:

The board is equipped with an isolated port to connect a USB converter cable. The board side is powered from the board. The converter side by the 5v from the converter.
Fortunately or unfortunately, the one that works is the only one that I have connected the USB converter to.
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rkumetz

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PostPosted: Thu May 14, 2020 7:13 pm    Post subject: Mystery Solved! Reply with quote

I finally had some quiet time after getting a single board that works for a demonstration.

Having checked that all of the VCC pins had good connections to +5V I then checked the AVCC pin which at just over 3 volts.
The culprit was a missing connection from the cap attached to the pin to +5V.

Once I installed a jumper I set BODEN back to 4V3 and everything works fine.


Thanks to all for your suggestions!
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AdrianJ

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PostPosted: Fri May 15, 2020 2:08 am    Post subject: Reply with quote

Good that you solved it !

I know its easy to be wise after the event, but a circuiit diagram of the actual board you had ( not one with a phantom AVcc connection ! ) would have made trouble shooting a lot easier.

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