(0x08) ASCII character before every print() message?

[espruino-discuss3]

Posted at 2015-07-26 by @yerpj

Hi guys,

I am sniffing data coming from the Espruino Pico through virtual COM port (Windows, Python), and I ran into a problem. It seems that each print(X) adds the special "Backspace" character before X, and finally adds "carriage return" +"Line feed".
I wonder if this "Backspace" character is really useful for anything? I am using the serial port for long time, I never had to use this "Backspace" character. If anyone could explain why it is so important, that would be great!

I am a beginner with Python, and I had to find a trick to remove this "BS" character. I tried this one:

myData=comPort.readline()
    myData=myData[2:]

Why "2" characters removed? I don't really understand, I thought only had to be removed, but Espruino seems to send another useless character in front of the printed string, maybe '>' ?

If anyone has a better idea on how to keep only the useful data, do not hesitate to post it :-)

Have a nice day.

[espruino-discuss3]

Posted at 2015-07-26 by @gfwilliams

The issue you have is that you have the console on USB, with echo turned on. For instance you usually get a prompt at the beginning of the line like >.

So if you print something, Espruino must delete that > character, then print what you told it to with a newline, then eventually put the > character back.

To avoid it, either:

• Call echo(0) to disable echoing
• Move the console away from USB (for example with Serial1.setConsole()). You can then use USB.print(...) to print exactly what you want to USB - no backspaces or deletes. However as the console will be gone, you'll have to reset the Espruino in order to write more code to it.

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Posted at 2015-07-27 by @yerpj

Thank you Gordon, calling "echo(0)" is exactly what I needed.