An FPGA-based USB 1.1 (full-speed) device core to implement USB-serial, USB-camera, USB-audio, USB-hid, etc. It requires only 3 FPGA common IOs rather than additional chips. 基于FPGA的USB 1.1 (full-speed) device端控制器，可实现USB串口、USB摄像头、USB音频、U盘、USB键盘等设备，只需要3个FPGA普通IO，而不需要额外的接口芯片。

Serial Port Programming in C++

Panic Playdate reverse-engineering notes/tools - covers file formats, server API and USB commands

DMA-accelerated multi-UART USB CDC for STM32F072 microcontroller

Samsung modem commands over USB serial connection and secret dialer codes extracted from system packages

USB serial device (CDC-ACM)

A serial port class, for interfacing between Macs and microcontrollers. Works over USB serial.

Android Telephony, RIL, Radio of Modem module

The most complete Python library to interface with MCP2221(A).

Arduino LANC to USB with GUI

A notifier that forward your sms from chip sim800c.

Virtual Serial Port (via USB-IP) to TCP Socket

Tutorials and example code for SAMD21 and SAMD51 microcontrollers

USB-UART-BRIDGE & ESP programmer featuring tag-connect

VEDirect data reader via serial USB for MPPT devices

Talk to a USB serial device without OS drivers!

A USB Serial band decoder and PTT breakout for the Icom IC-905 and IC-705, maybe other models. Can configure as a simple headless low power compact box, or add a touch display and optional encoders and switches for a remote control that supports transverter band display, control and band select.

Isolated USB to Serial/RS232/RS485 converter with ESD protected input/outputs.

Manage and control the volume of your programs. Connect an Arduino/Pi to control the program

A "bookmarklet" to add functionality to web-serial and websocket based web pages, to allow exchanging Adafruit BlueFruit Connect packets with circuitpython devices. With example code.py for BLE/WiFi/USB tank rover