Hi,
Can the Atmega32u4 usb port be used as a host?
So, like, if I attach cameras, flash drives, or any other usb devices to the port, can it work?
No. You need a MAX3241E USB host chip.
"The MAX3421E USB peripheral/host controller contains
the digital logic and analog circuitry necessary to
implement a full-speed USB peripheral or a full-/lowspeed
host compliant to USB specification rev 2.0. A
built-in transceiver features ±15kV ESD protection and
programmable USB connect and disconnect. An internal
serial interface engine (SIE) handles low-level USB
protocol details such as error checking and bus retries.
The MAX3421E operates using a register set accessed
by an SPI interface that operates up to 26MHz. Any SPI
master (microprocessor, ASIC, DSP, etc.) can add USB
peripheral or host functionality using the simple 3- or 4-
wire SPI interface.
The MAX3421E makes the vast collection of USB
peripherals available to any microprocessor, ASIC, or
DSP when it operates as a USB host. For point-to-point
solutions, for example, a USB keyboard or mouse interfaced
to an embedded system, the firmware that operates
the MAX3421E can be simple since only a
targeted device is supported."