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 Posted: Mar 11, 2010 - 05:00 AM |
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Joined: Sep 12, 2009
Posts: 28
Location: Erode
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i try ATmega644P or ATmega324P use for sending GPRS data through SIMCOM300 GSM in UART and for one led i used timer to blink it working well but some time the controller is stop working even timer also to work the blink off or on in UART i get like some unkown char and i don't know how to slove this can any one know what happened to MCU ,i try first ATmega324P than try ATmega644P even it has same Prob's
Thank You for ALL |
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Posted: Mar 11, 2010 - 06:34 AM |
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Joined: May 02, 2007
Posts: 992
Location: Nieuwegein, Netherlands
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sory my crystal bol is out of order.
you could try to debug the code in the simulator and see where it takes a unwanted turn.
also explain to us what the difference is between the ATMega324P and the ATMega644P. Then perhaps we understand why you changed from one to the other |
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Best friends:
1) Datasheet (and application notes)
2) AVR freaks forum( specially the tutorials
3) Fellow freaks, Can answer to problems that could not be answered by 1 or 2
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Posted: Mar 11, 2010 - 07:45 AM |
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Joined: Sep 12, 2009
Posts: 28
Location: Erode
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i change because ATmega324P has 2k ram and 32k flash but in ATmega644P has 4K ram and 64k flash i think that ram i used above 2k so it happened so i take ATmega644P but still it happened so Ram is not the prob's
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Posted: Mar 11, 2010 - 09:31 AM |
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Joined: Jul 18, 2005
Posts: 33138
Location: (using avr-gcc in) Finchingfield, Essex, England
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| Do the symptoms not suggest that the LED line is cross coupled with the RXD line - I'd check the schematic then the board for shorts. |
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