How many USB interfaces are possible

[ccrome]

Has anyone attempted to have more than one PIO based USB host/device?

The readme states, "Two PIO" but does that mean "Two PIO State Machines" or "Two PIO blocks"? If the former, is it possible to get fully 4 bitbang'd usb busses going? That would be pretty sweet.

[ccrome]

Ah, I think i've answered my own question: two PIOs are required, and there are only two PIOs on the RP2040, so limited to one extra USB device, correct?

Anyway, it's pretty amazing that this works! I just brought it up, and I can even attach multiple mice via a hub! Very cool!

[ghost]

Hi @ccrome
there is a function called pio_usb_host_add_port which adds a new host port. This can even be extendet to more ports if the value PIO_USB_ROOT_PORT_CNT (in file pio_usb_configuration.h) is changed (from 2 to 4 for example).
pio_usb_host_add_port needs only 2 parameters (PIO_USB2_DP_PIN, PIO_USB_PINOUT_DPDM) and should be called after tuh_init(BOARD_TUH_RHPORT).
By the way, this has got nothing to do with further PIOs and state machines. Its internally done by changing pin settings on the fly (jmp pin, in pin, set pins, sideset pins).
But this works only for host ports (for now).

[AbhishekAKA47]

can you help me in connecting a mouse to the pico and pico to the computer so its basically does nothing as of now. i am a novice