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Patrick
34 Posts |
 Posted - 18 Jun 2004 : 16:59:37
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Hi,
I've got a Bitsy Plus board that seems to lose it's mind about the DIP switch settings. Occasionally it will just bring up the debug menu instead of booting normally, or will try to do an upgrade from card, instead of running the start folder.
I'm going to pull it out of use and test it later on, but I was curious if this had happened before, and if you were interested in learning more.
Thanks, and have a good weekend!
-Patrick |
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akidder
1519 Posts |
Posted - 19 Jun 2004 : 10:50:04
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Thanks for your note, Patrick. DIP switches can wear out over time, as their contacts are typically made for a limited number of operations.
To make sure a switch is making the desired contact in the ON position, you might also try sliding the switch back and forth a couple times in case any contamination got into the switch.
Finally, make sure you are gentle with the switches when moving them; pressing down too hard, say, with the tip of a pen, can deform the switch.
If you think the board needs to be repaired, we can always work on it here. I hope this information helps! |
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akidder
1519 Posts |
Posted - 19 Jun 2004 : 10:52:40
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| p.s. I've moved your note from "General CE" to the "General Hardware" forums so others looking for this kind of information will see your note. |
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ctacke
877 Posts |
Posted - 21 Jun 2004 : 12:44:08
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| One added note - the debug output actually display the position that the device "sees" the switches in at boot. I often verify the reported position with the physical position when behavior becomes erratic. |
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Patrick
34 Posts |
Posted - 24 Jun 2004 : 10:59:28
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Is it just me, or is it upside down? When both switches are off, then it shows 0x3, and 0x0 when both on.
This is on my Bitsy Plus, I should say.
What is the best mode for normal operation?
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akidder
1519 Posts |
Posted - 24 Jun 2004 : 14:53:45
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On the DIP switches, "ON" means that the switch is mechanically closed, creating an electrical short between the terminals of the switch.
When the switches are "OFF" (open), they read electrically as "1" because the switched inputs to the Bitsy Plus have pull-up resistors. When the switches are "ON" (closed), the switches read electrical "0" as the switched inputs are now shorted to ground. |
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