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Follow up to post #27. There is a problem at 24 MHz startup speed switching from power up reset speed - this may explain failed SDIO on SDFat Beta code?

EDIT UPDATE: Building at 150 MHz start...

Indeed it is likely a rare not 'generally' easy to hit problem - and easy to work around. In doing the work on MICROS() using the millis() + CycleCounter timing I never triggered it. If the clock...

Paul - this millis() issues on certain set_arm_clock transitions. See: pjrc.com/threads/58053-T4-set_arm_clock-and-micros()

Title says micros() but that is because it tracks on millis() clocking.

This came to mind: github.com/ftrias/TeensyThreads/pull/21



Also note :: This branch [ PaulStoffregen/TeensyThreads {Latest commit on Aug 22, 2017} ] is 19 commits behind ftrias:master.

I saw github CORES has first pass of T4 USB Keyboard checked in followed by mouse and joystick - likely out with Beta 2 when it is ready:


Add USB keyboard for Teensy 4.0

Add USB mouse &...

Installed 1.49b1 over github cores on 1.8.10 : All seems good and well.

Improved USB Serial Receive code working fine.

RAM report looks different and about right - showing cross ref of...