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serial communication for AVR microcontroller

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MATHIVANAN

Mon Jul 07 2008, 05:12AM

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i am also having same problem in AVR -ATMEGA32Lworking at 8Mhz(baud reate=0x33). i am using MAX232CPE chip for RS232 to TTL converter. i am having USB to Serial converter for USb to RS232 Interface. When i am loop back the TTL output of the MAX232CPE, the data i am sending and getting on my PC is Correct, but when i receive on my ATMEGA32L is not correct,for that i am using LED indication, when i am getting correct byte the LED should goes to glow, is anything wrong or required on TTL side,i.e PULL UP resistor or something else.

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Ajay

Mon Jul 07 2008, 08:12AM

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why are you looping? you can send and receive from PC to test the 2-way communication. may i know the purpose of your test project.

Please do post the code to see the problem properly.

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MATHIVANAN

sashijoseph

Mon Jul 07 2008, 08:04PM

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@MATHIVANAN
Are the baud rates set up correctly on both sides.
Try once with a true serial port on the pc instead of the usb-rs converter.

Let there be music........

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MATHIVANAN

Tue Jul 15 2008, 09:07PM

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I tried on True Serial port and Baud rates are correct

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Ajay

Wed Jul 16 2008, 08:38AM

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hi mathivanan, i guess you replied almost after 1 week

i am really out of mind what was the exact point of discussion and what was the real problem. So if you dont mind..

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MATHIVANAN

Thu Jul 17 2008, 05:24AM

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I want to know is there any special fuse settings is available for TXN RXN .

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Ajay

Thu Jul 17 2008, 08:13AM

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in the cable? no for sure..

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pdi33

Thu Jul 17 2008, 08:53PM

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hi Mathi,
check if ur control registers are correctly initialised.
if ur using the RX complete interrupt, then the RXCIE bit of the UCSRB register should be set along with the RXEN bit.
and no, there are no fuse bits related to transmission/reception in the atmega 16/32. I have checked both transmission/reception@ 8mhz internal oscillator and they work just as fine without programming any additional fuse bits.