Notes on I2C
Summary
This article provides a comprehensive primer on the I2C protocol, covering open-drain signaling, topology, pull-ups, speed modes, and the roles of controllers and targets. It includes detailed explanations of frame structures, ACK/NACK handling, start/stop conditions, clock stretching, and practical ESP-IDF-style code samples for read/write operations. It's a solid reference for embedded developers and SMB IT teams implementing I2C devices.