Serial monitor with microless UNO on Atmega8??

Projects General Guidance
1

I have an ATMEGA8 in a standalone application.

I have successfully programmed the ATMEGA8 with an AVRISPv2 but am now trying to use the serial monitor for debug as well. I took an Arduino Uno and removed the ATMEL micro on it and connected the Reset, Tx, Rx, 5V and GND pins between the boards as on this page http://arduino.cc/en/Tutorial/ArduinoToBreadboard. I cannot figure out how to make the serial monitor work with this setup

I have a simple program below:

void setup() {
  // put your setup code here, to run once:
  Serial.begin(14400);  
}

void loop() {
  // put your main code here, to run repeatedly: 
  Serial.print("Have a nice day\n");
  delay(1000);
}

When I try to serial monitor it, I get this gobbledygook:

"?x<xÀøx<øx?xx??øx<ðøxüx<øx??x<x<ðxÀx?x<xÀøx<øxxxÀøx<øx?xx??øx<ð"

I am using one of the /dev/tty.usbserial ports

Any idea what is going on? I double checked that the baud rates are ok. Also, I do see activity on the TX line once a second.

Thanks

2

what clock speed do you have the 8 running at?

3

Osgeld:
what clock speed do you have the 8 running at?

4MHz, why do you ask?

4

arduino software is defined to run at 8 or 16, anything else and your going to have timing issues

try doubling your serial speed on the chip, and leaving your com program set to 14400

5

Have you defined a corresponding board type in boards.txt with the cpu speed set correctly? I don't know if that's all that's needed to get the serial speed correct, but I'd have thought it was.

6

Osgeld:
arduino software is defined to run at 8 or 16, anything else and your going to have timing issues

try doubling your serial speed on the chip, and leaving your com program set to 14400

How do I double the serial speed on the chip? I tried the following code:

void setup() {
  // put your setup code here, to run once:
  Serial.begin(28800);  
    // initialize the digital pin as an output.
  DDRB = 0xFF;
}

void loop() {
  // put your main code here, to run repeatedly: 
  Serial.write("Can you see me?\n");
  PORTB=B11100000;
  delay(100);               // wait for a second
  PORTB=B11111111;
  delay(100);   
}

and left the serial comm on the arduino window @ 14400 but still got garbage.
I tried using an 8MHz crystal, setting "Serial.begin(14400)" and still get garbage btw

Is there some sort of protocol settings I need to set for the FTDI (parity, newline, etc)? I am using an OSEPP FTDI breakout board.

7

Sometime you should try to use baud rate of 9600 .