USB Devices Communication and Writing Custom Drivers

README.md

Tools and Utilities for USB-TTL Communication

On Linux, USB devices comeup as files under /dev/ttyUSB0 and so on. One can create custom USB devices (with little bit of hardware tinkering). These devices can be based on USB-TTL converters. These are available with USB-A, mini-USB, micro-USB. These devices are almost invariably uses FTDI chips. Can use the program FT_Prog to flash the ftdi chip to set your own custom device names. It is also possible to use libftdi for more hardcore stuff. Documentation is sparse though. Need to look at examples. For power users, one can build a custom board (PCB) with ftdi chips. There are several FTDI chips available which is able to carry out highspeed USB-3 communication.

These converters can be used with any microcontroller. If using Arduino based controller, check this out to write/read data to serial devices: https://www.arduino.cc/en/Tutorial/SoftwareSerialExample.

• USB-TTL Devices Banggood-china-ecommerce.
• Arduino Software Serial.
• FT_Prog.
• libftdi. For hardcore users only, sparse documentation!.

usb_devices.sh

#!/bin/bash

for sysdevpath in $(find /sys/bus/usb/devices/usb*/ -name dev); do
    (
        syspath="${sysdevpath%/dev}"
        devname="$(udevadm info -q name -p $syspath)"
        [[ "$devname" == "bus/"* ]] && continue
        eval "$(udevadm info -q property --export -p $syspath)"
        [[ -z "$ID_SERIAL" ]] && continue
        echo "/dev/$devname - $ID_SERIAL"
    )
done

# Sample Output
# /dev/bsg/6:0:0:0 - VT_SSD_USB_3.0_000000000002-0:0
# /dev/sda - VT_SSD_USB_3.0_000000000002-0:0
# /dev/sda1 - VT_SSD_USB_3.0_000000000002-0:0
# /dev/sg0 - VT_SSD_USB_3.0_000000000002-0:0
# /dev/input/event2 - LiteON_HP_Basic_USB_Keyboard
# /dev/hidraw0 - LiteON_HP_Basic_USB_Keyboard
# /dev/input/event3 - PixArt_USB_Optical_Mouse
# /dev/input/mouse0 - PixArt_USB_Optical_Mouse
# /dev/hidraw1 - PixArt_USB_Optical_Mouse