Noise or random characters displayed while using UART in Atmega 16

[Adithya N]

I have interfaced max232 with a atmega 16 microcontroller.I am using usb to serial adapter and have connected pins 2,3 and 5 of the serial adapter to max232 using jumper wires and connecting wires in a breadboard.I am using hyperterminal.When pins 2 and 3 are shorted the characters are displayed on the screen,meaning that the max232 circuit is working.But when i interface it with atmega 16 no characters are displayed on my hyperterminal.My program should return the character with a '()' symbol.But when i disturb the RX,TX or ground wires i see some random characters on the screen.What could be the problem?


Thank you

 

[kalbun]

Are you absolutely sure you configured the ATMega correctly? In most cases you need to change the appropriate DDR register to set the serial TX pin as an output.

 

[jayanth.devarayanadurga]

Loose connection. Post your code.