lorencc

Perfect. Thanks much.

Been all over the Internet. No proposed solution worked. #include <Arduino.h> volatile bool led_state = false; #define LED_PIN 13 /////////////////////////////////////////////////////////////////// void timerISR() { led_state =...

Installd beta version of Teensy dunno. Works fine.

Installed latest Teensyduino beta. Fixed it.

Will do that next time, thanks. M4 MAC Powerbook. Runs IDE 1.8x just fine, problem is with 2.x Yes, those two versions. Reinstalled each twice.

Sometimes I get this: /Users/loren/Library/Arduino15/packages/teensy/tools/teensy-compile/11.3.1/arm/bin/arm-none-eabi-gcc -O2 -Wl,--gc-sections,--relax...

Tried a lot of options, reinstalled the IDE and Teensyduino, Latest versions of everything, cleared the arduino cache. No matter what I do I get this: void setup() { Serial.begin(9600); Serial.printf ("start\n"); } void loop() {...