strange problem,,,,,,ISP.

Log in or register to post comments
Go To Last Post
4 posts / 0 new
Author
Message
msd
msd's picture
Level: Wannabe
Joined: Thu. Nov 19, 2009
Posts: 84 View posts
#1
Posted by msd: Fri. Sep 9, 2011 - 02:09 PM
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

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...

Tags:

AVR Microcontrollers, megaAVR and tinyAVR, ATmega32
Top
jgmdesign
jgmdesign's picture
Level: Moderator
Joined: Mon. Mar 19, 2007
Posts: 17726 View posts
Location: Long Island New York
Posted by jgmdesign: Fri. Sep 9, 2011 - 02:51 PM
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

are you trying to power the project using the parallel port? YOu might also want to look for ground loops.

JIm

I would rather attempt something great and fail, than attempt nothing and succeed - Fortune Cookie

 

"The critical shortage here is not stuff, but time." - Johan Ekdahl

 

"Step N is required before you can do step N+1!" - ka7ehk

 

"If you want a career with a known path - become an undertaker. Dead people don't sue!" - Kartman

"Why is there a "Highway to Hell" and only a "Stairway to Heaven"? A prediction of the expected traffic load?"  - Lee "theusch"

 

Speak sweetly. It makes your words easier to digest when at a later date you have to eat them ;-)  - Source Unknown

Please Read: Code-of-Conduct

Atmel Studio6.2/AS7, DipTrace, Quartus, MPLAB, RSLogix user

Top
msd
msd's picture
Level: Wannabe
Joined: Thu. Nov 19, 2009
Posts: 84 View posts
Posted by msd: Mon. Sep 12, 2011 - 04:20 AM
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

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?

Top
msd
msd's picture
Level: Wannabe
Joined: Thu. Nov 19, 2009
Posts: 84 View posts
Posted by msd: Mon. Sep 12, 2011 - 04:46 AM
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

gosh!......this smps adaptors....I hate them....changed to reliable power...it works..don't use this adaptors....

Top