communication between Arduino and ATmega16

Projects Programming
1

Dear Friends

I want to send a character, for example "s", to arduino from Atmega16. I use a command getchar() in code vision. But unfortunately, when we load this code on my arduino, I can see a non-meaning words in Serial Monitor. I define pin 7 and 8 as Rx and Tx, respectively in my code.
please kindly help to me to deal with this problem.
Thanks.

My Ardunino's code is:

#include <SoftwareSerial.h>

SoftwareSerial MDC20(7, 8); // RX, TX

void setup()
{
Serial.begin(9600);
while (!Serial)
{

}

MDC20.begin(9600); // set the data rate for the SoftwareSerial port
}
void loop ()
{
String str ;
while(1)
{
if ( Serial.available() )
{
str = Serial.read();
MDC20.println(str);
}
}
}

2

there is a smiley in your code... Please correct your post above and add code tags around your code. [code] // your code here [/code]. it should look like this:// your code here (and press ctrl-T (PC) or cmd-T (Mac) in the IDE before copying to indent properly)

Serial.read(); returns an int not a String object.

why do you add a while(1) as you have the loop() already looping anyway?

are you sure you connected Rx to Tx and Tx to Rx?

3

Have a look at the examples in Serial Input Basics - simple reliable ways to receive data.

...R

4

Thanks for your reply. I edited my code, but the non-meaning words is printed on Serial Monitor, again. I used a putchar('a') in codevision to send 'a' variable to Arduino from Atemaga 16. It should be mentioned that I recieve a none-meaning words like a sign. please help me.

Many many thanks.

// Receiving single characters

char receivedChar;
boolean newData = false;

void setup() {
    Serial.begin(9600);
    Serial.println("<Arduino is ready>");
}

void loop() {
    recvOneChar();
    showNewData();
}

void recvOneChar() {
    if (Serial.available() > 0) {
        receivedChar = Serial.read();
        newData = true;
    }
}

void showNewData() {
    if (newData == true) {
        Serial.print("This just in ... \n");
        Serial.println(receivedChar);
        newData = false;
    }
}
[\code]
5

Hadi_Kalani:
It should be mentioned that I recieve a none-meaning words like a sign. please help me.

That can happen when the baud rate of the sender and receiver don't match.

Get your program to print the ASCII value of the character received. I think this will do it

Serial.println((byte) receivedChar);

...R