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Forum Index : Microcontroller and PC projects : Color Maximite Problem

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TASMA
Newbie

Joined: 30/11/2011
Location: Australia
Posts: 10
Posted: 09:52am 22 Dec 2012
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My Colour Maximite when powered up is in bootload mode, power light flashing, if I reload the hex file it comes back to normal, but next time I power up I have the same problem. I have to re-install hex file everytime I turn it on. How do I fix this?

Regards

Brian
 
CircuitGizmos

Guru

Joined: 08/09/2011
Location: United States
Posts: 1425
Posted: 10:00am 22 Dec 2012
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The bootload line that goes to the processor - processor pin 73 - should be at 3.3V for normal operation and 0V for bootload operation.

On the CGCOLORMAX1 I used an external resistor (10k) to make sure that this pin is pulled high (to 3.3V).


Micromites and Maximites! - Beginning Maximite
 
Geoffg

Guru

Joined: 06/06/2011
Location: Australia
Posts: 3194
Posted: 10:20am 22 Dec 2012
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what sort of CMM is it (Altronics kit, UBW32, etc)?
Geoff Graham - http://geoffg.net
 
TASMA
Newbie

Joined: 30/11/2011
Location: Australia
Posts: 10
Posted: 10:35am 22 Dec 2012
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The CMM is an Altronics kit, it worked ok when first assembled

 
TassyJim

Guru

Joined: 07/08/2011
Location: Australia
Posts: 6098
Posted: 12:24pm 22 Dec 2012
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My first guess is a leaky 'load firmware' push button.

If so, the external 10k resistor as used by CircuitGizmos would probably help.

It may also be something to do with power supply rails slow to stabilize.
What happens if you do a quick power off then on again without going through the reprogramming?

Jim
VK7JH
MMedit   MMBasic Help
 
TASMA
Newbie

Joined: 30/11/2011
Location: Australia
Posts: 10
Posted: 01:05pm 22 Dec 2012
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I found that cycling the power it eventually came good. Connected a 10k resistor as suggested and all working OK again.

Thanks everyone for your help

Brian
 
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