Atmega2560 problem with UART communication

[Thiliniv]

I wrote a code for communication with Atmega2560 and a PC. My program is when the microcontroller ransmit a character
(say 65) it should be read using hyperterminal.

But in hyperterminal i just get some garbage characters. pls help me.

 

[majinbuu]

well the thing is you should transfer ascii values , but when you transmit 65 from controller you actually transmit 65 in hex , but the hyperterminal reads it as ascii and prints the ascii charater for it , another problem may be of improper baud rate ...

 

[RuneHansen]

Hey Thiliniv... I will help you step by step.

step 1:

In this eksampel i will use the my own Atmega2560 development board - with a 16 MHZ crystal... i I hope That this will help you


(THIS IS MY AVR DEVELOPMENTBOARD WITH THE ATMEGA2560 plucked in )



(THIS MUST BE WHAT YOU GET WHEN YOU ARE USING UART... RIGHT )


The reason why you get garbage characters is the internal-clock :/ we have to change it



(IN THIS PIC YOU CAN SEE THE ATMEGA2560 DEFAULT INTERNAL-CLOCK SETTINGS)

Step 2:

Now we are going to change the Internal-clock on the Atmega2560
Im using AVR studio 4


( CHANGE IT TO what you can see on the pic )

Step 3:

And after you have done that


(AND NOW IS SHOULD ALL WORK FINE)

Hope this helped
Rune Hansen

 

[RuneHansen]

did it help?????

 

[Thiliniv]

RuneHansen,

What you are telling is also correct , i think. Thanx for replying.

I solved the problem by unticking the "CKDIV8" fuse bit. I was using the internal oscillator of the micro controller which is 8MHz. When "CKDIV8" is programmed it is divided by 8. But when i untik it i culd get 8MHz again.

 

[RuneHansen]

Good to hear if u have any other problems with the atmega2560.. just ask

---------- Post added at 17:40 ---------- Previous post was at 17:38 ----------

And take a look at my profile. in my album i have some pic of my new atmega2560 developmentboard if your are interestet?