[solved] Serial print: when is it finished / queue is empty.

Projects Programming
1

Hello,

my arduino sends some bytes and it is working fine (with serial.print (Hardware Uart)). I want to repeat the String as fast as possible. But I don't want to fill the queue.

Is there a flag, that signals "sending the Sting finished"? Or can i get the remaining bytes in the queue?

Thank you.

Snowyrain

2

This blocks until the serial transmit buffer is empty.

Serial.flush();
3

Look at Serial.availableForWrite()

4

Hello and thank you!

//Only send data when serial-queue is completely empty
if(Serial.availableForWrite() >= SERIAL_TX_BUFFER_SIZE-1 ){
Serial.print("SOMETHING");
}

Have a nice day.

Snowyrain

5

What are you communicating with? What baud rate are you using? An Arduino can usually work at 500,000 baud if you need high throughput.

On the other hand I would be surprised if there isn't a better alternative to repeating a message as often as possible.

...R