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Thanks! We are testing with several different cards from several different manufacturers - most of them quite new. In my journeys to troubleshoot this, I've tried decreasing the speed to 25MHz. This was before we discovered that communication often fails already at 400kHz speed and we never...

Yes, absolutely - if it were possible to go beyond 100% I would. Yes. There is strong decoupling here, for this very reason. Literally any sketch that works with the SD card replicates the problem.

Hello, I am asking about this issue partly because I think it may be of interest for PRJC too look into as well. Might also not be, I suppose :) We are in a situation where we have had to extend the Teensy 4.1 SD card slot using an extension cable connected via the on-board SDIO socket...

Sorry, no - this is why I started the thread in the first place; it is already assembled into a product and potted for harsh environments. Had it been easy, I would have instead replaced it as soon as I realized there was an issue. I'm shipping later this week, however if the product comes back...

@XFer: No, not really, I mean I can access the USB via a short chassis mount extension cable and I can press the PROG button and punch probes through the silicon with enough accuracy to get at the breakout pins, but not really any SMT pins reliably. @Paul: You're right that I am using an older...

Dear defragster, I'm not sure what more I could have said regarding known sketches? NO sketch, including blink (which is very well known, AFAIK), will run - about 50% of the time when properly powered up via either VIN or USB. IDE version (1.8.8 for the record) seemed beside the point, as no...

I've been digging around in the core, using PTC5 (LED) to figure out exactly where things go wrong. The processor does indeed boot up, but at the following line (compiling with -O0 of course)... mk20dx128.c 752: if (!(RTC_CR & RTC_CR_OSCE)) { ...the processor hard-faults (ending up in...

Dear defragster, Every new Teensy 3.2 I have on hand does present itself on USB when connected, just not as a CDC serial port. They show up with a VID and PID under ports and can be programmed without pressing PROG. There is no problem with the sketch, it does not matter what sketch is loaded...

Hello, I recently purchased 2pcs Teensy 3.2 from Mouser, 474-DEV-13736 reportedly from SparkFun. When connecting one of them for the first time I noticed the lack of the typical "device connected sound" present on Windows machines, but thought little of it. Tried downloading code and it didn't...

That is correct. The VIN pin is routed to an LDO which would drop about half a volt. I am powering the Teensy via the 3V3 rail. As it turns out the Teensy had been damaged. Popping a spare onto the board solved the issue and the unit is now running on its own power: Thank you for your...

Hello! I am having an issue with a Teensy 3.2 that will not properly power up when supplied by external 3V3. There is not much of any schematic to speak of except the 3V3 regulator and capacitors (3.3V rail is checked to be stable, noise free and without any over-voltage condition). Also, there...