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The Digispark => Digispark Pro Support => Topic started by: jwhendy on April 02, 2016, 07:53:28 am

Title: Troubleshooting SerialUSB printing (just prints one character, then stops)
Post by: jwhendy on April 02, 2016, 07:53:28 am

Hello,


I believe I followed the instructions on DigiCDC (https://digistump.com/wiki/digispark/tutorials/digicdc) correctly, but am having issues reading via the serial monitor. I opened up Examples -> DigiSparkCDC -> Echo and it works as I'd expect. Whatever I send is then printed out in the serial monitor. Reading, however, only seems to start to send, then stops. See the attached screenshot of what I get when running Examples -> DigiSparkCDC -> Print.

I started troubleshooting this when attempting to see if the Digispark Pro would work with an ADXL345 accelerometer I have. I modified my code, which successfully reads all three axes on an Arduino Uno to contain the following modified/extra code:

Code: [Select]

#include <Wire.h>
#include <DigiCDC.h>

// bunch of setup code for adxl

int x = 0;

long now = millis();

void setup() {

  // join i2c bus (address optional for master)
  Wire.begin();

  SerialUSB.begin();

}

void loop() {

  if(millis() - now > 100)
  {

    //read the acceleration data from the ADXL345
    // this is defined elsewhere; omitting for brevity's sake
    readFrom(DATAX0, howManyBytesToRead, _buff);
    x = (((int)_buff[1]) << 8) | _buff[0];

    // this is the actual code I want to use; I replaced with just printing
    // a string to test SerialUSB, which is when I found it didn't work
    // SerialUSB.println(x);
    SerialUSB.print(F("123"));

    now = millis();

  }

  // have tried each and both of these in case my cycle wasn't < 10ms
  // SerialUSB.refresh();
  // SerialUSB.delay(1);

}
Anything look out of place? I'm more interested in why the Print example wouldn't work. Thanks for any suggestions!