Teensy 4.1 custom board Not detected com port

J

jimit_jaishwal

New member
Hello team Teensy,

I developed/ cloned an entire teensy from scratch following the original schematics for learning purpose and R&D. Now the entire PCB and its components are same as TEENSY 4.1. But as I plug in to USB the port is not getting detected on terminal/ com Port, basically COM port is not getting detected in PC. Please do give what could be the possible issue. Is there any bootloader or something am I missing in this thing please do give suggestion as earliest.

Thanks
 
Sorry I have not built my own boards but have played on a few that others have done.

Hard to say without more information, probably schematic...

Are you using one of these chips?

PJRC Store

www.pjrc.com www.pjrc.com

Which IMXRT board are you using?

How much flash?
...
 
KurtE said:
Sorry I have not built my own boards but have played on a few that others have done.

Hard to say without more information, probably schematic...

Are you using one of these chips?

PJRC Store

www.pjrc.com www.pjrc.com

Which IMXRT board are you using?

How much flash?
...
Click to expand...
Yes, I am using IMXRT 1062A chip, I flash through USB! I am totally new, I have question about teensy, If we have new processers then totally bland without boot loader, this case we can detect usb?
 
The bootloader chip @KurtE referred to, must be a PJRC-programmed version. If you purchase the chip from PJRC [this one for Teensy 4.1], it is programmed with the required functionality.

Paul
 
Last edited:
jimit_jaishwal said:
What if my chip is not programmed with that required functionality? what should I do?
Click to expand...
As far as I understand it, you won't be able to get a compatible cloned Teensy board.
Remove your chip and replace it with a chip purchased from PJRC.

Paul
 
PaulS said:
As far as I understand it, you won't be able to get a compatible cloned Teensy board.
Remove your chip and replace it with a chip purchased from PJRC.

Paul
Click to expand...
So, I need to replace IC_MKL02Z32_T4_QFN16 this chip for Teensy 4.1 and Order form PJRC? am I right OR all three chip I need to replace?

PJRC Store

www.pjrc.com www.pjrc.com
 
jimit_jaishwal said:
So, I need to replace IC_MKL02Z32_T4_QFN16 this chip for Teensy 4.1 and Order form PJRC? am I right OR all three chip I need to replace?
Click to expand...
I think you only need to replace the bootloader chip, and not the IMXRT microcontroller & not the flash memory chip because you started with an empty bootloader chip. I assume that nothing has paired yet.
From the bootloader page:
An IMXRT microcontroller and flash memory chip must be paired with this MKL02 to form a working system
Click to expand...

But I would like @PaulStoffregen to confirm.

Paul
 
jimit_jaishwal said:
What if my chip is not programmed with that required functionality? what should I do?
Click to expand...

Desolder the blank MKL02 chip (purchased from a non-PJRC source) and replace it with a pre-programmed IC_MKL02Z32_T4_QFN16 chip purchased from PJRC.

Assuming your PCB design is correct and nothing terrible has happened (like 5V or 12V accidentally touching the chips) you should be fine to leave all the other chips in place. Upon first power-up, the IC_MKL02Z32_T4_QFN16 will pair with your IMXRT1062 chip and configure its fuse memory as needed.
 
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