Dual SerialUSB and MIDI config possible?

[Edwin_T]

I'd like to have 2 serialUSB and a MIDI port but in Arduino I can only select serial + MIDI or dual serial.

Can someone point me to the right direction (or confirm it's not possible at al)?

Thanks, Edwin.

[PaulStoffregen]

Should be possible. You need to edit usb_desc.h inside {Arduino}/hardware/teensy/avr/cores/teensy4 (or teensy3 - there are 2 copies of this file). See the comments in the top of that file for instructions.

[Edwin_T]

Thanks! I'll try and post results here.

[Edwin_T]

Thanks Paul,

It took some time but it seemes to work now. For others who read this, I added a 2nd Serial port to USB MIDI AUDIO SERIAL. To add this item to the menu in Teensy 4.0 ADD the next 2 lines in c:\Program Files (x86)\Arduino\hardware\teensy\avr\boards.txt

teensy40.menu.usb.serial2midiaudio.build.usbtype=U SB_MIDI_AUDIO_DUAL_SERIAL
teensy40.menu.usb.serial2midiaudio=Dual Serial + MIDI + Audio

And the next lines to c:\Program Files (x86)\Arduino\hardware\teensy\avr\cores\teensy4\us b_desc.h

#elif defined(USB_MIDI_AUDIO_DUAL_SERIAL)
#define VENDOR_ID 0x16C0
#define PRODUCT_ID 0x048B
#define MANUFACTURER_NAME {'T','e','e','n','s','y','d','u','i','n','o'}
#define MANUFACTURER_NAME_LEN 11
#define PRODUCT_NAME {'T','e','e','n','s','y',' ','D','S','e','r','i','a','l','/','M','I','D','I','/','A','u','d','i','o'}
#define PRODUCT_NAME_LEN 25
#define EP0_SIZE 64
#define NUM_ENDPOINTS 8
#define NUM_INTERFACE 8
#define CDC_IAD_DESCRIPTOR 1
#define CDC_STATUS_INTERFACE 0
#define CDC_DATA_INTERFACE 1 // Serial
#define CDC_ACM_ENDPOINT 2
#define CDC_RX_ENDPOINT 3
#define CDC_TX_ENDPOINT 3
#define CDC_ACM_SIZE 16
#define CDC_RX_SIZE_480 512
#define CDC_TX_SIZE_480 512
#define CDC_RX_SIZE_12 64
#define CDC_TX_SIZE_12 64
#define CDC2_STATUS_INTERFACE 2 // SerialUSB1
#define CDC2_DATA_INTERFACE 3
#define CDC2_ACM_ENDPOINT 4
#define CDC2_RX_ENDPOINT 5
#define CDC2_TX_ENDPOINT 5
#define MIDI_INTERFACE 4 // MIDI
#define MIDI_NUM_CABLES 1
#define MIDI_TX_ENDPOINT 6
#define MIDI_TX_SIZE_12 64
#define MIDI_TX_SIZE_480 512
#define MIDI_RX_ENDPOINT 6
#define MIDI_RX_SIZE_12 64
#define MIDI_RX_SIZE_480 512
#define AUDIO_INTERFACE 5 // Audio (uses 3 consecutive interfaces)
#define AUDIO_TX_ENDPOINT 7
#define AUDIO_TX_SIZE 180
#define AUDIO_RX_ENDPOINT 7
#define AUDIO_RX_SIZE 180
#define AUDIO_SYNC_ENDPOINT 8
#define ENDPOINT2_CONFIG ENDPOINT_RECEIVE_UNUSED + ENDPOINT_TRANSMIT_INTERRUPT
#define ENDPOINT3_CONFIG ENDPOINT_RECEIVE_BULK + ENDPOINT_TRANSMIT_BULK
#define ENDPOINT4_CONFIG ENDPOINT_RECEIVE_UNUSED + ENDPOINT_TRANSMIT_INTERRUPT
#define ENDPOINT5_CONFIG ENDPOINT_RECEIVE_BULK + ENDPOINT_TRANSMIT_BULK
#define ENDPOINT6_CONFIG ENDPOINT_RECEIVE_BULK + ENDPOINT_TRANSMIT_BULK
#define ENDPOINT7_CONFIG ENDPOINT_RECEIVE_ISOCHRONOUS + ENDPOINT_TRANSMIT_ISOCHRONOUS
#define ENDPOINT8_CONFIG ENDPOINT_RECEIVE_UNUSED + ENDPOINT_TRANSMIT_ISOCHRONOUS

[localhero]

Hi guys,

I also need dual Serial + MIDI + Audio for Teensy 4.1
I've modified the files boards.txt and usb_desc.h (on my PC it's here : C:\Users\david\AppData\Local\Arduino15).
But the option never appears in IDE 2 for Teensy 4.1 but appears for the other boards.
Am I missing something ?

Thanks
Regards

[KurtE]

Hi guys,

I also need dual Serial + MIDI + Audio for Teensy 4.1
I've modified the files boards.txt and usb_desc.h (on my PC it's here : C:\Users\david\AppData\Local\Arduino15).
But the option never appears in IDE 2.
Am I missing something ?

Thanks
Regards

You might look at the Arduino IDE issue: https://github.com/arduino/arduino-ide/issues/1030
It shows a workaround

[localhero]

Hi Kurt,

I've completed my post, I was presuming it was some caching issue as I see the option for the other boards if I change.
But still nothing for Teensy 4.1, let's try the workaround

[localhero]

The workaround fixes the problem in IDE.
Now I have to understand how to connect one device with webserial on one port, and IDE on the other port to show logs.

Well usbaudio is not working anymore.

[localhero]

Usb audio and midi with dual serial is working, the problem was in my web page code (javascript with webserial, webaudio and webmidi api).