T_40 USB Host not working

[Fehlicks]

Hello friends,

my project plan: To connect my USB mouse to Teensy 4.0 via USB Host, and let the Teensy forward all incoming mouse data to the computer, like a "passthrough". I soldered a USB A Female cable to the Teensy for USB Host support.

I'm measuring ~4.78 V. The mouse lights up, but my Teensy is not getting any data.

Here's my (very simple) testing code. I'm using USBHost_t36. Is anything wrong with it maybe?

#include "USBHost_t36.h"

USBHost usbHost;
MouseController mouseController(usbHost);

void setup() {
  Serial.begin(9600);
  Serial.println("Init");
  
  usbHost.begin();
}

void loop() {
  usbHost.Task();
  if (mouseController.available())
  {
    Serial.println("Juhu!");
    mouseController.mouseDataClear();
  }
}

Let me know if you have any ideas =)
Felix

[PaulStoffregen]

Most likely cause is a hardware issue. Maybe show us photos of how you connected the cable?

Or it could be something on the software side. To get much more info, edit USBHost_t36.h to enable the verbose debug info. That will at least tell you whether the library is detecting and trying to enumerate your device.

[KurtE]

Did you try with the mouse example sketch?

My guess is you need to add at least one HID Controller objects like here is an updated version, I also threw in a HUB object in case you plug one in and some devices like a few keyboards have one internal. :

#include "USBHost_t36.h"

USBHost usbHost;
USBHIDParser hid1(usbHost);
USBHIDParser hid2(usbHost);
USBHub hub1(usbHost);

MouseController mouseController(usbHost);

void setup() {
  Serial.begin(9600);
  Serial.println("Init");
  
  usbHost.begin();
}

void loop() {
  usbHost.Task();
  if (mouseController.available())
  {
    Serial.println("Juhu!");
    mouseController.mouseDataClear();
  }
}

[defragster]

That code doesn't show anything here.

Start from this :: ...\hardware\teensy\avr\libraries\USBHost_t36\exam ples\Serial\Mouse\Mouse.ino

That will confirm the hardware to start.

[defragster]

Took me a bit to find a wired mouse … KurtE's updated example now works here as well.

[Fehlicks]

Thanks for your replies. Unfortunately, neither the complete official example nor KurtE's program give me output. I have enabled verbose output in USBHost_t36.h. This is my output when I power up the Teensy with my USB mouse already connected to it:

Init
USB2 PLL running
 reset waited 6
USBHS_ASYNCLISTADDR = 0
USBHS_PERIODICLISTBASE = 20003000
periodictable = 20003000
port change: 14001403
    connect
  begin reset
port change: 14001005
  port enabled

And this is the output I get when disconnecting the USB mouse while Teensy is running:

port change: 1C00100A
    disconnect
disconnect_Device:
USBDriver (available_drivers) list: 20001E00 -> 20002420 -> 20002A40
USBDriver (dev->drivers) list: (empty
USBDriver (available_drivers) list: 20001E00 -> 20002420 -> 20002A40
delete_Pipe 20003400
  shut down async schedule
  Free transfers
    * 536884544 * remove * free
    * 536884352
    * 536884416 * remove * defer free until QH
  Free transfers attached to QH
    * 536884352
    * 536884416
    * 536884480
* Delete Pipe completed
removed Device_t from devlist
  disable

And this is the output I get by connecting the USB mouse again, while the Teensy is already running:

port change: 14001403
    connect
  begin reset
port change: 14001005
  port enabled
  end recovery
new_Device: 1.5 Mbit/sec
new_Pipe

I tried USB mice from two different vendors. I can post pics of my wiring later if needed. What do you guys think?

[defragster]

Tried here today on two different 1062 Teensy's with USB Host wiring - and others ( T4 and T_3.6 ) prior - the example code is tested to work. ANd KurtE tested to work - now and before.

Problem would seem to be hardware connect usability of the D+/D- wiring. Unless the two mice are odd - the one found and used here is a Logitech.

[Fehlicks]

I might have soldered D+ and D- in the wrong order, maybe I got a wrong pinout for my USB cable. I will switch them and update you. Thanks!

[Fehlicks]

Switched D+ and D- cables and everything works as expected, using KurtE's code (but without the second USBHIDParser and USBHub).

Thanks for the help and sorry for wasting your time.

[defragster]

Great news. Can you post a pic to complete the solution