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I noticed timing inconsistencies in my project, and further debugging pinpointed it to the problem below. The text should be updating every second, but the returned values are >> 1000ms.

To clarify, the text is not showing up every second. The delays between texts vary according to fluctuating start and finish values.

I'm using a Teensy 3.2. Changing the baud rate doesn't help.

Is my timing crystal busted? Is there a serial buffering issue? I don't know how to fix either of these.

Any help would be appreciated!

Edit:

Here's the code if anyone wants to test. I found that adding more delay functions screws the output up in completely unlinear ways.

unsigned long start, finished, elapsed;

void setup() {
  Serial.begin(115200);
}
 
void loop() {
  Serial.println("Start...");
  start = millis();
  Serial.println(start);
  delay(1000);
  finished = millis();
  Serial.println(finished);
  Serial.println("Finished");
  elapsed = finished - start;
  Serial.print(elapsed);
  Serial.println(" milliseconds elapsed");
  Serial.println();
}

Edit #2:

I thought it was worth showing everyone this screenshot. It looks like delay(1000) just isn't functioning at all.

Edit #3:

I debugged it with an LED and it blinked at exactly 1s intervals. It seems like delay(1000) works, so the problem must be related to the serial buffering. I also updated my software but that didn't help.

I noticed timing inconsistencies in my project, and further debugging pinpointed it to the problem below. The text should be updating every second, but the returned values are >> 1000ms.

To clarify, the text is not showing up every second. The delays between texts vary according to fluctuating start and finish values.

I'm using a Teensy 3.2. Changing the baud rate doesn't help.

Is my timing crystal busted? Is there a serial buffering issue? I don't know how to fix either of these.

Any help would be appreciated!

Edit:

Here's the code if anyone wants to test. I found that adding more delay functions screws the output up in completely unlinear ways.

unsigned long start, finished, elapsed;

void setup() {
  Serial.begin(115200);
}
 
void loop() {
  Serial.println("Start...");
  start = millis();
  Serial.println(start);
  delay(1000);
  finished = millis();
  Serial.println(finished);
  Serial.println("Finished");
  elapsed = finished - start;
  Serial.print(elapsed);
  Serial.println(" milliseconds elapsed");
  Serial.println();
}

Edit #2:

I thought it was worth showing everyone this screenshot. It looks like delay(1000) just isn't functioning at all.

Edit #3:

I debugged it with an LED and it blinked at exactly 1s intervals. It seems like delay(1000) works, so the problem must be related to the serial buffering. I also updated my software but that didn't help.

Edit #4:

New developments from further debugging:

• The problem is not reproducible on a different computer. The Arduino serial monitor on other computers displays correctly.
• Updating to the latest OSX, arduino IDE, and teensyduino did not help.
• Terminal 'screen' command surprisingly prints correct serial communication.
• Serial monitors from 3rd party apps, like CoolTerm and Arduino IDE do not work.

I noticed timing inconsistencies in my project, and further debugging pinpointed me to the below problem. the text should be updating every second, but the returned values are >> 1000ms.

To clarify, the text is not showing up every second. The delays between texts vary according to fluctuating start and finish values.

I'm using a teensy 3.2. changing the baud rate doesn't help.

Is my timing crystal busted? is there a serial buffering issue? idk how to fix either of these.

Any help would be appreciated!

Edit:

Here's the code if anyone wants to test. I found that adding more delay functions screws the output up in completely unlinear ways.

unsigned long start, finished, elapsed;

void setup() {
  Serial.begin(115200);
}
 
void loop() {
  Serial.println("Start...");
  start = millis();
  Serial.println(start);
  delay(1000);
  finished = millis();
  Serial.println(finished);
  Serial.println("Finished");
  elapsed = finished - start;
  Serial.print(elapsed);
  Serial.println(" milliseconds elapsed");
  Serial.println();
}

Edit #2:

Thought it was worth showing everyone this screenshot. Looks like delay just isn't functioning at all.

Edit #3:

I debugged with an LED and it blinked at exactly 1s intervals. Seems like delay works, so the problem must be serial buffering related. I also updated my software but that didn't help.

I noticed timing inconsistencies in my project, and further debugging pinpointed it to the problem below. The text should be updating every second, but the returned values are >> 1000ms.

To clarify, the text is not showing up every second. The delays between texts vary according to fluctuating start and finish values.

I'm using a Teensy 3.2. Changing the baud rate doesn't help.

Is my timing crystal busted? Is there a serial buffering issue? I don't know how to fix either of these.

Any help would be appreciated!

Edit:

Here's the code if anyone wants to test. I found that adding more delay functions screws the output up in completely unlinear ways.

unsigned long start, finished, elapsed;

void setup() {
  Serial.begin(115200);
}
 
void loop() {
  Serial.println("Start...");
  start = millis();
  Serial.println(start);
  delay(1000);
  finished = millis();
  Serial.println(finished);
  Serial.println("Finished");
  elapsed = finished - start;
  Serial.print(elapsed);
  Serial.println(" milliseconds elapsed");
  Serial.println();
}

Edit #2:

I thought it was worth showing everyone this screenshot. It looks like delay(1000) just isn't functioning at all.

Edit #3:

I debugged it with an LED and it blinked at exactly 1s intervals. It seems like delay(1000) works, so the problem must be related to the serial buffering. I also updated my software but that didn't help.

I noticed timing inconsistencies in my project, and further debugging pinpointed me to the below problem. the text should be updating every second, but the returned values are >> 1000ms.

To clarify, the text is not showing up every second. The delays between texts vary according to fluctuating start and finish values.

I'm using a teensy 3.2. changing the baud rate doesn't help.

Is my timing crystal busted? is there a serial buffering issue? idk how to fix either of these.

Any help would be appreciated!

Edit:

Here's the code if anyone wants to test. I found that adding more delay functions screws the output up in completely unlinear ways.

unsigned long start, finished, elapsed;

void setup() {
  Serial.begin(115200);
}
 
void loop() {
  Serial.println("Start...");
  start = millis();
  Serial.println(start);
  delay(1000);
  finished = millis();
  Serial.println(finished);
  Serial.println("Finished");
  elapsed = finished - start;
  Serial.print(elapsed);
  Serial.println(" milliseconds elapsed");
  Serial.println();
}

Edit #2:

Thought it was worth showing everyone this screenshot. Looks like delay just isn't functioning at all.

Edit #3:

I debugged with an LED and it blinked at exactly 1s intervals. Seems like delay works, so the problem must be serial buffering related. I also updated my software but that didn't help.

I noticed timing inconsistencies in my project, and further debugging pinpointed me to the below problem. the text should be updating every second, but the returned values are >> 1000ms.

To clarify, the text is not showing up every second. The delays between texts vary according to fluctuating start and finish values.

I'm using a teensy 3.2. changing the baud rate doesn't help.

Is my timing crystal busted? is there a serial buffering issue? idk how to fix either of these.

Any help would be appreciated!

Edit:

Here's the code if anyone wants to test. I found that adding more delay functions screws the output up in completely unlinear ways.

unsigned long start, finished, elapsed;

void setup() {
  Serial.begin(115200);
}
 
void loop() {
  Serial.println("Start...");
  start = millis();
  Serial.println(start);
  delay(1000);
  finished = millis();
  Serial.println(finished);
  Serial.println("Finished");
  elapsed = finished - start;
  Serial.print(elapsed);
  Serial.println(" milliseconds elapsed");
  Serial.println();
}

Edit #2:

Thought it was worth showing everyone this screenshot. Looks like delay just isn't functioning at all.

Edit #3:

I debugged with an LED and it blinked at exactly 1s intervals. Seems like delay works, so the problem must be serial buffering related. I also updated my software but that didn't help.