Yahoo Groups archive

AVR-Chat

Index last updated: 2026-04-28 22:41 UTC

Message

Another push here... Serial on ATmega128

2005-07-06 by Alex De Lara

Hello,

I read this on other answer and was wondering if fuse setting

>> From: "wbounce" <wbounce@...>
>> Subject: RE: [AVR-Chat] help problem in uart 	wbounce1
>> Send Email Send Email
>> I know you go other responses but garbage on the uart 
>> could also mean wrong baud or corrupt fuse settings.


could be part of the reason why I cannot get anything to spit 
out of my ATmega128 serial...

I thought that just using the examples from the datasheet
would suffice to program the usart, baudrate and send a
character...

Also, does the baud rate prescaler use the system clock
(internally) by default ?  Is that correct ? 
(meaning I should  not have to mess up with the fuses -CKSEL- 
currently 0001 - also tried 0100 - both for the internal 
calibrated osc). 
I just wanted to go plain here and see something coming out....
Actually, have installed 4 leds that I can turn or/off/shift
and they are working fine, at least I can see that stuff
is being executed.

The ATmega103-compatibility-mode-fuse is off, meaning that I 
had to use STS to write the UBBRH register. 

(i know, i know... without an scope things are nastier than 
it should ...  but I use the leds outputs as trace points yikes ! )

-Thanks for reading.

Attachments

Move to quarantaine

This moves the raw source file on disk only. The archive index is not changed automatically, so you still need to run a manual refresh afterward.