strange problem,,,,,,ISP.

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msd
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Posted by msd: Fri. Sep 9, 2011 - 02:09 PM
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Hello to all......
I have one sensor which gives data through RS-485...I used atmega32 and max485 to read the sensor data...I have used isp programming to program atmega32...(using parallel port)...Now I am facing strange problem...I program the chip connecting ISP cable...after programming it starts the program , it works ok....but when I remove ISP cable and restart the program it does not work properly...it works ok only when ISP cable connected...after more digging I found that MISO, MOSI and SCK either of the three pin is coonected , it works ok...how to solve this if I want to run program without ISP cable connected...

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AVR Microcontrollers, megaAVR and tinyAVR, ATmega32
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jgmdesign
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Posted by jgmdesign: Fri. Sep 9, 2011 - 02:51 PM
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are you trying to power the project using the parallel port? YOu might also want to look for ground loops.

JIm

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msd
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Posted by msd: Mon. Sep 12, 2011 - 04:20 AM
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I don't power it form parallel port,,,I don't find any ground loops...my miso,mosi,sck lines are open..I mean it only connectes during programming , else kept open...should i put there something?

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msd
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Posted by msd: Mon. Sep 12, 2011 - 04:46 AM
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gosh!......this smps adaptors....I hate them....changed to reliable power...it works..don't use this adaptors....

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