USB Host to a CP2104 USB to UART Bridge

[wigahluk]

Hello,

Apologies in advance if I'm not using the correct terminology, this is my first attempt programming microcontrollers and I'm new to this world. I'm trying to connect a USB device CP2104 to an RP2040 Pi Pico running as a USB host. My intention is to control the pico with this device. I'm able to run the bare_api example and get some data on the Device Descriptor:

Device attached, address = 1
Device 1: ID 10c4:ea60
Device Descriptor:
  bLength             18
  bDescriptorType     1
  bcdUSB              0200
  bDeviceClass        0
  bDeviceSubClass     0
  bDeviceProtocol     0
  bMaxPacketSize0     64
  idVendor            0x10c4
  idProduct           0xea60
  bcdDevice           0100
  iManufacturer       1     Silicon Labs
  iProduct            2     CP2104 USB to UART Bridge Controller
  iSerialNumber       3     01D7A115
  bNumConfigurations  1
Device removed, address = 1

In a Linux machine, I'm also able to connect with Minicom (minicom -b 115200 -H -D /dev/ttyUSB0) to the device. If I use the buttons and physical controls on the device, I see the codes in the terminal.

I haven't been able to read the codes from the device within the pico, I tried the CDC host example (being a USB to UART bridge, I thought this one was my best shot) as well as the HID one (I give it a shot as I was not successful with the CDC case), in both, I see the calls to tuh_mount_cb and tuh_umount_cb but none of the specific mount callbacks for CDC nor HID are ever called (like the tuh_cdc_mount_cb one).

I also have tried the examples on Arduino (https://github.com/adafruit/Adafruit_TinyUSB_Arduino/blob/master/examples/DualRole/serial_host_bridge/serial_host_bridge.ino) with the same results, I can see when the device is mounted, but cannot read any event from it.

I appreciate any help, thanks!

[hathach]

cp210x and ftdi driver isn't supported yet

[IngHK]

See #2488.
Any kind of feedback, review and test is welcome.

[Takatugu-Endou]

Top url
https://www.hobbytronics.co.uk/
USB Host Controller Board V2.4
https://www.hobbytronics.co.uk/product/host-board
USB Host Board – CDC Class Serial Software
https://www.hobbytronics.co.uk/usb-host-cdc
Test Review(Japanese site)
https://cba.sakura.ne.jp/parts01/kit_i66.htm

Trying out the PIC USB host function (CDC-Basic)(Japanese site)
http://zattouka.net/GarageHouse/micon/USB/HOST/CDC/CDC.htm

I think the only solution is to either buy or make it.

[hathach]

Updated, it is already supported for some time