Resolve the No file directory error when reading GPIO values on an Adafruit MCP2111 by verifying SPI connection, loading the mcp211x driver, and ensuring correct sysfs access.
Read MoreEnable CONFIG_GPIO_SYSFS in Yocto kernel config to expose GPIO pins via /sys/class/gpio for legacy userspace access.
Read MoreResolve ARM GPIO pin conflicts and undefined behavior by configuring the Linux pinctrl subsystem via device tree and using the modern character device interface.
Read MoreResolve compilation errors when building C programs with libgpiod on Raspberry Pi by installing libgpiod-dev and linking with -lgpio.
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