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  VS Arduino › › › Sharing the Serial port (beta 2) SOLVED
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Normal Topic Sharing the Serial port (beta 2) SOLVED (Read 9239 times)
John C
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Sharing the Serial port (beta 2) SOLVED
Aug 6th, 2012 at 1:25pm
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I find that no Serial output comes from the sketch until a breakpoint is hit. The first output from the following code is "in loop 1", where we should see a "Started" followed by a "in loop 0". Breakpoints are on each digital write.
int loopCnt = 0;

void setup()
{
     pinMode(13,OUTPUT);
     Serial.begin(115200);
     Serial.println("Started");
}

void loop()
{
     Serial.print("in loop "); Serial.println(loopCnt);
     digitalWrite(13,HIGH);
     loopCnt++;
     delay(1000);
     digitalWrite(13,LOW);
     delay(1000);
}
« Last Edit: Aug 7th, 2012 at 7:51am by John C »  
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John C
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Re: Sharing the Serial port (beta 2)
Reply #1 - Aug 6th, 2012 at 1:31pm
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Further to this I find that all works fine when I use a baud rate of 9600 rather than 115200.

This is not reliable all the time
« Last Edit: Aug 6th, 2012 at 1:41pm by John C »  
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Tim@Visual Micro
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Re: Sharing the Serial port (beta 2)
Reply #2 - Aug 6th, 2012 at 2:47pm
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My answer has been removed because it was rubbish!
« Last Edit: Aug 6th, 2012 at 7:00pm by Tim@Visual Micro »  
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Tim@Visual Micro
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Re: Sharing the Serial port (beta 2)
Reply #3 - Aug 6th, 2012 at 2:53pm
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9600 is just forcing the arduino to crawl and preventing it from overflowing it's 250 byte transmit buffer.

Use a Timer to ensure certain parts of your code are running at different speeds. This will more closly match a real-world example.

By the way I have been useing SoftwareSerial as a debug transport recently and it works really well. If you are not using break/pause or startup/wait then you only need the tx wire from any arduino pin to the rx pin of an fdti cable.
« Last Edit: Aug 6th, 2012 at 2:56pm by Tim@Visual Micro »  
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John C
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Re: Sharing the Serial port (beta 2)
Reply #4 - Aug 6th, 2012 at 5:56pm
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Please note the messages are limited to one every two seconds (spot the delays  Cool ) - surely not too much data.
Breakpoints are on the digitalWrite statements.
I am aware that the debugger can do it all for this example - this is a very simplified example rather that the proper sketch.
« Last Edit: Aug 6th, 2012 at 5:59pm by John C »  
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Tim@Visual Micro
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Re: Sharing the Serial port (beta 2)
Reply #5 - Aug 6th, 2012 at 6:15pm
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oh I am really sorry. I was using a little screen earlier when i looked at the message and rushed too fast!

Is the dtr enabled on your serial window when it opens? if not please switch on thanks.

if that doesn't fix it then please see what happens if you remove the serial.begin()

thanks
« Last Edit: Aug 6th, 2012 at 7:02pm by Tim@Visual Micro »  
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Re: Sharing the Serial port (beta 2)
Reply #6 - Aug 7th, 2012 at 7:50am
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Problem went away when I set DTR on the Serial Window.

SOLVED

Thanks. Smiley
  
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Re: Sharing the Serial port (beta 2) SOLVED
Reply #7 - Aug 7th, 2012 at 1:22pm
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great, thanks for the update
  
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