This tutorial explains the basics of the MIDI protocol and shows how to use PHP's serial communication extension to open a serial port, construct MIDI Note‑On messages, send them to a music device, and properly close the connection, with suggestions for extending the code.
SPI is a high‑speed, full‑duplex serial bus using four pins (CS, SCK, MOSI, MISO) with configurable clock polarity and phase, whose timing diagram shows data transfer on clock edges, and Linux provides a driver framework built around spi_driver, spi_transfer, and spi_message structures for reliable sensor communication.
The USB‑Type C connector introduces a reversible plug with E‑Marker‑enabled cables, supports up to 10 Gb/s data and 100 W power delivery, negotiates data and power roles via the CC pins, and uses the USB‑PD protocol over those pins to dynamically select voltage‑current profiles for fast charging.
The article explains the rapid evolution of the PCIe bus standard—from the widely used PCIe 3.0 through PCIe 4.0 and 5.0 up to the upcoming PCIe 6.0—detailing version milestones, bandwidth improvements, signaling changes, backward compatibility, and its impact on hardware and AI workloads.
This article explains the fundamentals of UART as a universal asynchronous receiver/transmitter, compares the electrical and protocol characteristics of RS-232, RS-422, and RS-485 standards, and discusses their performance, wiring, and application considerations in embedded and industrial systems.
This article introduces the GPIO interface, explains how to configure pins for input or output, details the step‑by‑step process of opening connections, reading and monitoring inputs, writing outputs, and closing the connection, and provides a complete Raspberry Pi hardware demo with code and results.
