[OpenWrt Wiki] GPIO
https://openwrt.org/docs/techref/hardware/port.gpio03.09.2019 · GPIO Read General Purpose Input/Output and GPIO documentation in Linux. * mmc_over_gpio * GPIOs of AR913x SoC * oldwiki GPIO Hardware GPIOs are commonly used in router devices for buttons or leds. They only safely supply or sink (pull to GND) a maximum of 4mA approx., and the voltage is usually 3.3V when active. Only two states are possible: high or …
General-purpose input/output - Wikipedia
https://en.wikipedia.org/wiki/General-purpose_input/outputMany circuit boards expose board-level GPIOs to external circuitry through integrated electrical connectors. Usually, each such GPIO is accessible via a dedicated connector pin. Like IC-based GPIOs, some boards merely include GPIOs as a convenient, auxiliary resource that augments the board's primary function, whereas in other boards the GPIOs are the central, primary function of the board. Some boards, which are classified usually as multi-function I/O boards, ar…
How to Build a Raspberry Pi Router - Step by Step …
11.06.2021 · The Dual Gigabit Carrier Board powered by Raspberry Pi Compute Module 4 is equipped with dual Gigabit Ethernet ports and dual USB 3.0 ports, making it suitable for soft router applications, while keeping the hardware to a …