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Hey guys, I reflowed the oscillators on three Teensy boards that previously showed the ARM JTAG failure, without replacing any parts, and they all started working again. I am now able to upload firmware, power cycle each board about 20 times, and control the motors without any issues. Based on...

Thanks for the reply. As @defragster and @jmarsh point out, it is actually ARM JTAG or SWD failure. In our system: We use the Teensy to send PWM signals to motor drivers and read encoder signals from the motors. All signals are strictly 3.3V logic. We have TVS diodes under the motor...

Thanks for the details. What do you think could be the reason for the increasing number of units having this issue? Also, I don’t think we see this issue recurring in the same system once we swap the Teensy. In our system: We use the Teensy to send PWM signals to motor drivers and read encoder...

I was referring Paul's answer here https://forum.pjrc.com/index.php?threads/what-does-a-blinking-led-on-teensy-4-1-mean-when-program-mode-button-is-pressed.71879/post-318671

Hi, We have been using Teensy 4.1 for over 2 years for a robotic project without major issues. But recently (last 4 months) we have started seeing more Teensy 4.1 having flash memory chip failure (4 quick blinks in red LED) after running for a short amount of time. The problem will get fixed by...

Hi, I have multiple Teensy 4.1 connected to a robotic system running Linux. I do NOT have physical access of the Teensy so I can't push the program button but I can connect to the host through networking. I set udev rule like this to identify them during serial communication with my program so...

Sorry for the confusion, I meant the GPIO from a single board computer that runs the uploading program.

I see. So when we integrate Teensy into an embedded system and attempt to upload firmware update to it remotely, we will have to connect the PROGRAM pin to a GPIO so the host can control it in case of flash memory corruption. Make sense?

Hi, I have a Teensy 4.1 was unplugged during code uploading. When it is plugged again, I can see the RED LED is having a 4 quick blink pattern. According to Paul here, it indicates failure with the flash memory chip. Normally when I upload program, I can see "Found HalfKay Bootloader" and the...