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GPIO (General Purpose Input/Output) GPIO pins are versatile pins on microcontrollers that can be configured as either inputs or outputs to interface with various electronic components. GPIO Configuration Modes Floating Input: The pin is left unconnected, which can lead to unpredictable states due to noise. Not recommended for practical applica ...

Button Operation Principal A push button functions by connecting or disconnecting a circuit. When pressed, the circuit closes; when released, it opens. To read this state via a Genarel Purpose Input/Output (GPIO) pin, the pin must not be left floating, as ambient electrical noise could cause erratic readings. To prevent this, a pull-up or pull- ...

Overview Mutexes (mutual exclusion locks) are synchronization primitives provided by the Linux kernel to hendle concurrent accesss to shared resources. Unlike semaphores which allow multiple concurrent access, a mutex ensures that only one thread can hold the lock at any given time. This article demonstrates how to integrate mutex synchronizati ...

Legacy GPIO Interface Kernel API /* Device-tree helper */ int of_get_gpio(struct device_node *np, int idx); /* Pin life-cycle */ int gpio_request(unsigned gpio, const char *label); void gpio_free(unsigned gpio); /* Direction */ int gpio_direction_input(unsigned gpio); int gpio_direction_output(unsigned gpio, int value); /* Value access */ ...