Teensy 4.0: need an example of using USB host

[Andy Belov]

I want to connect a MIDI keyboard to the USB host on Teensy 4.
Just can' t find any examples of reading from it.

If anybody has an example of reading data from the USB Host (D+/D-) port on Teensy 4.0, please send it my way.

Thanks.

[neurofun]

Arduino filemenu->Examples->USBHost_t36->Serial->MIDI->InputFunctions.ino

[Andy Belov]

Found it:
C:\Program Files (x86)\Arduino\hardware\teensy\avr\libraries\USBHos t_t36\examples\Serial\MIDI\InputFunctions

I just got the connector and the current limiter. Will try it this weekend.

Thank you.

[Orhema]

Andy did you figure it out. I am a beginner that biught the 4.0 n a whif, without looking ahed to all the diifculties it could pose. Please How do you suggest I connect a midi keybaord to the teensy so I can send out cv and gate signals to a diy analog synth that recieves it. Thank you

[Andy Belov]

Hi Orhema,

Here is the USB host schematics:

Here is the PCB:

Install Teensyduino from here: https://www.pjrc.com/teensy/teensyduino.html
Look into this example: C:\Program Files (x86)\Arduino\hardware\teensy\avr\libraries\USBHos t_t36\examples\Serial\MIDI\InputFunctions

Should be enough to get you started. I mostly shows how to receive MIDI signals from a keyboard, but I think the "...16x16" example shows how to send.

[Orhema]

Hi Orhema,

Here is the USB host schematics:

Here is the PCB:

Install Teensyduino from here: https://www.pjrc.com/teensy/teensyduino.html
Look into this example: C:\Program Files (x86)\Arduino\hardware\teensy\avr\libraries\USBHos t_t36\examples\Serial\MIDI\InputFunctions

Should be enough to get you started. I mostly shows how to receive MIDI signals from a keyboard, but I think the "...16x16" example shows how to send.

Thank you Andy. I was lurking in the forums and just found out the usb host functionality just became available for the 4.0. However it seems it still cant be used as a USB device. Also please I would like to ask if the Teensy can be used as a USB Hub