[Solved] Core not recognized over serial

Troubleshooting
1

Hello everyone,

I am attempting to read values over serial, but receive this message in the terminal:

I didn't find any cores available via serial
No serial port identified

I’ve connected one of my Cores to both a MacBook Pro and a PC, trying every USB port on each. Of my three Cores, this is the only one for which that message is displayed. Has anyone else encountered this issue and is there a way to resolve it?

Wondering if the issue was the code on each Core, I flashed the code from the “faulty” Core onto the others and the others worked fine. That single Core does not. Below is the code currently loaded:

#define STEPS 200
#define ADCwidth 12
#define ADCsteps pow(2, ADCwidth)
#define maxSpeed 256 //RPM (for test, using max LED value 255)

//Stepper stepper1(STEPS, D0, D1, D2, D3);

int potPin = A0;
int ledPin = D7;
int potVal = 0;
uint8_t speed = 0;

void setup() {
    Serial.begin(9600);
    pinMode(potPin, INPUT);
    pinMode(ledPin, OUTPUT); //LED brightness correlates to motor speed
    //stepper1.setSpeed(0);
}

void loop() {
    potVal = analogRead(potPin);
    speed = floor(potVal/(ADCsteps/maxSpeed));
    analogWrite(ledPin, speed);
    //stepper1.setSpeed(speed);
    //stepper1.step(1);

    display();
}

void display() {
    Serial.print("Pot Val: ");
    Serial.print(potVal);
    Serial.print(" | ");
    Serial.print("Speed: ");
    Serial.println(speed);
}

Finally, I flashed the “Blink An LED” app onto the Core and modified it to print the LEDstate. Terminal again displayed the above message.

Any help would be greatly appreciated.

Thanks!

2

Are you using Spark-cli and the command spark identify?

If you are, you should instead using spark serial monitor or any other Terminal program :wink:

Try swapping the USB cable and see what happens :wink:

3

Thanks @kennethlimcp. Switching cables doesn’t change anything.
I’m going to try to reset the Core and then re-flash the app.

4

Strange…it just appears to be that app. I reset the Core to default firmware, then wrote a simple app to print sequential integers and it worked just fine. Going to test with other apps, but it appears to just be that one.