Count number of bytes transmited with Serial.print

Projects Networking, Protocols, and Devices
1

Hello to all;

I'm totally new in Arduino and I don't have experience in programming, so I hope you can help me.

I'm making a communication with two Xbee and serial.print() in Simulink, but I need to know the exactly number of bytes transmitted. I'm sending an array where the values change constantly, so every time I send something I need to count the number bytes.

I found the function size_t (long): print() , but I don't have any idea of how to implement it, and the information in the web are very advanced for me.

This is my actual code, it works fine but I need to implement the transmitter count:

int as=0;    
Serial1.print('

The rest of the code are declaration of simulink but the Arduinos code is very simple.

Can you give me some idea of how implement that?

Thanks);
for (as=0;as<u_width;as=as+1){
   
Serial1.print(UART_1[as],6);
    if (as!=(u_width-1)){
        Serial1.print(',');
    }
}
Serial1.println('%');


The rest of the code are declaration of simulink but the Arduinos code is very simple.

Can you give me some idea of how implement that?

Thanks
2

Instead of serial.print, use either the sprintf() or the snprintf() function to format the data. Then you can determine the exact size of the buffer before sending it anywhere.

3

Or you could write a simple function to iterate through the array and send each byte one at a time, counting as you go.

I'm curious to know why it is necessary to know the number of bytes sent?

...R

4

Can you give me some idea of how implement that?

Here's a hint. Serial.print() returns a value. Can you guess what that value is? If you guessed "the number of characters it printed", you win.

int count = 0;

int as=0;   
count += Serial1.print('

);
for (as=0;as<u_width;as=as+1){
 
count += Serial1.print(UART_1[as],6);
    if (as!=(u_width-1)){
        count += Serial1.print(',');
    }
}
count += Serial1.println('%');

// count characters have been sent to the serial port...

5

PaulS:
Serial.print() returns a value. Can you guess what that value is? If you guessed "the number of characters it printed", you win.

Thanks. I had never taken any notice of that as I was never concerned to know.

...R