Issues

• usb_midi.h in sendStop() sends the wrong command byte

  PaulStoffregen/cores#804 · Filter by author bwm-projects opened on Aug 27, 2026

• Potential missing end-while-loop semicolon or {} in startup.c

  PaulStoffregen/cores#802 · Filter by author ssilverman opened on Jul 19, 2026

• Teensyduino 1.60.0 breaks MTP on Teensy 3.6

  PaulStoffregen/cores#801 · Filter by author jrw429 opened on May 15, 2026

• New Teensyduino Release?

  PaulStoffregen/cores#788 · Filter by author brendanmatkin opened on Sep 12, 2025
  2

• EventResponder: Declare attachThread as virtual function

  PaulStoffregen/cores#786 · Filter by author SamHalvoe opened on Jun 28, 2025

• usb_configuration not resetting to zero upon usb disconnect.

  PaulStoffregen/cores#780 · Filter by author SpencerLommel opened on Apr 8, 2025
  1

• C++ 20 support issues

  PaulStoffregen/cores#777 · Filter by author iontodirel opened on Feb 23, 2025
  3

• [Feature Request] Allow E2END to be set as compile time option

  PaulStoffregen/cores#776 · Filter by author noisymime opened on Feb 5, 2025
  1

• [teensy4] Why does USB_MIDI4 expose fewer USB endpoints than USB_MIDI?

  PaulStoffregen/cores#768 · Filter by author forderud opened on Oct 7, 2024

• [USB] endpoint_queue_head pointer4 values if EXPERIMENTAL_INTERFACE is set

  PaulStoffregen/cores#760 · Filter by author forderud opened on Sep 22, 2024

• abort() should do something

  PaulStoffregen/cores#748 · Filter by author A-Dunstan opened on Jun 20, 2024

• Micromod PWM - Pin 45 does not work - QuadTimer4 is not initialized. Should Duplicate pins work?

  PaulStoffregen/cores#741 · Filter by author KurtE opened on May 5, 2024

• It's impossible to modify joystick hid reports to working state.

  PaulStoffregen/cores#738 · Filter by author MalwareX95 opened on Mar 17, 2024

• Native ethernet broken on Teensy 4.1 starting with version v1.58

  PaulStoffregen/cores#737 · Filter by author ernestum opened on Mar 1, 2024
  1

• USB Joystick does not enumerate on power-up needs unplug/plug cycle to work

  PaulStoffregen/cores#730 · Filter by author EclipseBoom opened on Jan 4, 2024
  1

• Teensy 3 includes new.h, declaring cxa_guard... even with gcc11

  PaulStoffregen/cores#726 · Filter by author swanah opened on Nov 15, 2023
  4

• Corrupted UART data with large buffers - work around found.

  PaulStoffregen/cores#710 · Filter by author reubenstr opened on Aug 4, 2023
  1

• sd card total size and used size

  PaulStoffregen/cores#686 · Filter by author MungoBerry opened on Mar 8, 2023

• Feature request: callback / function to check for (PC) USB host suspending Port

  PaulStoffregen/cores#685 · Filter by author FeuerSturm opened on Feb 10, 2023
  1

• FS.h interfaces often return either incorrect large values or zero when there's an underlying filesystem error

  PaulStoffregen/cores#676 · Filter by author ssilverman opened on Jan 11, 2023

• 7-bit serial support on Teensy 4 sets top bit

  PaulStoffregen/cores#664 · Filter by author ssilverman opened on Nov 17, 2022
  5

• New (valid) warnings raised by GCC 11 in v1.58 beta 2

  PaulStoffregen/cores#660 · Filter by author tttapa opened on Oct 3, 2022

• SerialUSB.read is not functional

  PaulStoffregen/cores#652 · Filter by author ddavis-2015 opened on Sep 4, 2022
  2

• delayNanoseconds returns too early

  PaulStoffregen/cores#646 · Filter by author slenius opened on Jun 1, 2022
  1

• Recommend renaming NUM_ENDPOINTS to LAST_ENDPOINT

  PaulStoffregen/cores#640 · Filter by author liudr opened on Mar 26, 2022
  2