wheezardth
Member
Hello everybody!
I've been developing a control system based on the Teensy 3.2 module and I finally rolled out my own boards based on the Teensy 3.2 reference design!
I bought a few MKL04 chips from Paul a while back and put two boards together - one with only the Teensy core components and VREG and one with that and all the additional periphery I designed around it.
Both boards show the same behavior.
If I plug in an USB cable, no device shows up in Device manager.
If I prepare a sketch for uploading and press the Program button, the PC registers an USB device, completes upload and loses the USB device again. That happens very fast.
The code in the sketch does not seem to execute.
Voltage regulation seems nominal and RESET & PROG are normally high.
I posted my schematic and PCB layout if you would like to look.
It's worth noting that I tried starting the board with and without the parallel caps to X2, it did not yield different results.
I did use a rather heavy Abracon ABMM2 18pF crystal, so that mighty be what's upsetting it.
I don't know where to start looking for signs of life. Any tips where to start?
Thanks!
Best,
S
I've been developing a control system based on the Teensy 3.2 module and I finally rolled out my own boards based on the Teensy 3.2 reference design!
I bought a few MKL04 chips from Paul a while back and put two boards together - one with only the Teensy core components and VREG and one with that and all the additional periphery I designed around it.
Both boards show the same behavior.
If I plug in an USB cable, no device shows up in Device manager.
If I prepare a sketch for uploading and press the Program button, the PC registers an USB device, completes upload and loses the USB device again. That happens very fast.
The code in the sketch does not seem to execute.
Voltage regulation seems nominal and RESET & PROG are normally high.
I posted my schematic and PCB layout if you would like to look.
It's worth noting that I tried starting the board with and without the parallel caps to X2, it did not yield different results.
I did use a rather heavy Abracon ABMM2 18pF crystal, so that mighty be what's upsetting it.
I don't know where to start looking for signs of life. Any tips where to start?
Thanks!
Best,
S