SX/Blitz question.....
Beau Schwabe
Posts: 6,568
Folks,
I feel silly asking this question, but I have an old SX/Blitz that I have recently blown the cobwebs off of
and an SX18 to go with it... (Contest Idea)
My question is, in hooking everything up an using the latest SX editor (http://www.parallax.com/dl/sw/sx/SX-KeyEditor3_0.exe)
I seem to have intermittent Read/Verify values when trying to establish a valid link to the SX18.
1) I have a 0.1uF decoupling cap directly on the chip (thought this would help) .... reading the chip I get random HEX patterns of...
FFF,FFB,FBF,FBB,BFF,BFB,BBB ...subsequent readings produce different random HEX results.
2) My power supply is a 9V battery through a 7805 regulator with 10uF cap on the output.
3) My SX cable is about 1 foot long of 22 AGW zip cable (same as what you would expect to see inside a computer for the IDE hard/floppy drive cable).
4) I am using a IBM ThinkPad laptop computer with Windows98 installed.
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Beau Schwabe - Mask Designer III
National Semiconductor Corporation
(Communication Interface Division)
500 Pinnacle Court, Suite 525
Mail Stop GA1
Norcross,GA 30071
I feel silly asking this question, but I have an old SX/Blitz that I have recently blown the cobwebs off of
and an SX18 to go with it... (Contest Idea)
My question is, in hooking everything up an using the latest SX editor (http://www.parallax.com/dl/sw/sx/SX-KeyEditor3_0.exe)
I seem to have intermittent Read/Verify values when trying to establish a valid link to the SX18.
1) I have a 0.1uF decoupling cap directly on the chip (thought this would help) .... reading the chip I get random HEX patterns of...
FFF,FFB,FBF,FBB,BFF,BFB,BBB ...subsequent readings produce different random HEX results.
2) My power supply is a 9V battery through a 7805 regulator with 10uF cap on the output.
3) My SX cable is about 1 foot long of 22 AGW zip cable (same as what you would expect to see inside a computer for the IDE hard/floppy drive cable).
4) I am using a IBM ThinkPad laptop computer with Windows98 installed.
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Beau Schwabe - Mask Designer III
National Semiconductor Corporation
(Communication Interface Division)
500 Pinnacle Court, Suite 525
Mail Stop GA1
Norcross,GA 30071
Comments
If you commit to the contest I'll get you an SX-Key today.
Confirm at kgracey@parallax.com
- Ken
the project in mind was inspired by her.
I was going to build this for her anyway contest or not, and thought I would take advantage
of the chip and contest to see ' IF ' I could get something in on time.
In another life I would love to commit.
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Beau Schwabe - Mask Designer III
National Semiconductor Corporation
(Communication Interface Division)
500 Pinnacle Court, Suite 525
Mail Stop GA1
Norcross,GA 30071
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James Newton, Host of SXList.com
james@sxlist.com 1-619-652-0593 fax:1-208-279-8767
SX FAQ / Code / Tutorials / Documentation:
http://www.sxlist.com Pick faster!
Back to the original problem, do you think that the SXKey(I don't have) would solve the intermittency that I am seeing with the SXBlitz(that I do have)?
I don't necessarily need the DEBUG feature with the SX to develop a project, I have other equipment that I can use to get that part of the job done.
I'm worried that if I borrow your SXKey that I might experience a similar problem.
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Beau Schwabe - Mask Designer III
National Semiconductor Corporation
(Communication Interface Division)
500 Pinnacle Court, Suite 525
Mail Stop GA1
Norcross,GA 30071
So it may be wiser to focus on what might be wrong with cables (that serial cable seems suspect to me) or try another SX18.
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James Newton, Host of SXList.com
james@sxlist.com 1-619-652-0593 fax:1-208-279-8767
SX FAQ / Code / Tutorials / Documentation:
http://www.sxlist.com Pick faster!