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VisionFive 2
World's first high-performance RISC-V single board computer (SBC) with an integrated GPU
Configure Device Drivers
GPIO Driver
GPIO APIs

VisionFive 2
World's first high-performance RISC-V single board computer (SBC) with an integrated GPU
VisionFive 2 Lite
A budget-friendly and feature-rich RISC-V single board computer
JH-7110
Word's first mass-produced high-performance RIS-V application processor
VisionFive
World's first generation affordable RISC-V boards designed to run Linux
JH-7100
Intelligent vision processing platform
StarStudio IDE
Integrated Development Environment for Linux and Bera Metal development

GPIO APIs

This topic provides details for the GPIO APIs.

gpio_request


Synopsis	`int gpio_request(unsigned gpio, constchar * label)`
Description	Requests access to a GPIO interface.
Parameter	gpio: The GPIO index number to be requested label: The GPIO name. Leave it null if you do not know the label.
Return	Success: 0 Failure: Error code

gpio_free


Synopsis	`void gpio_free(unsigned gpio)`
Description	Releases a previously requested GPIO interface, making it available for other consumers.
Parameter	gpio: The GPIO index number to be released.
Return	None

gpio_direction_input


Synopsis	`int gpio_direction_input(unsigned gpio)`
Description	Sets a GPIO interface as input.
Parameter	gpio: The GPIO index number
Return	Success: 0 Failure: Error code

gpio_direction_output


Synopsis	`int gpio_direction_output(unsigned gpio, int value)`
Description	Sets a GPIO interface as output.
Parameter	gpio: The GPIO index number value: The expected level, 0 as low level, 1 as high level
Return	Success: 0 Failure: Error code

gpio_get_value


Synopsis	`int gpio_get_value(unsigned gpio)`
Description	Gets the level from a target GPIO interface. The level is used to define whether the GPIO is an input or an output.
Parameter	gpio: The GPIO index number
Return	Success: The level of the target GPIO interface: 0 as low level, 1 as high level. Failure: 1

gpio_set_value


Synopsis	`int gpio_set_value(unsigned gpio, int value)`
Description	Sets the level to a target GPIO interface. The level can be used to alter the GPIO from an output to an output. Note: The GPIO has to be an output, otherwise, this function may have no effect.
Parameter	gpio: The GPIO index number value: The expected level, 0 as low level, 1 as high level
Return	None

of_get_named_gpio


Synopsis	`int of_get_named_gpio(const struct device_node np, const char propname, int index)`
Description	Obtains a GPIO interface via which you can use the GPIO Application Interface (API).
Parameter	np: Device node where the target is obtained. propname: Name of the property that contains GPIO specifier(s). index: Index of the GPIO.
Return	Success: The GPIO index number via which you can use the GPIO API Failure: 1

of_get_named_gpio_flags


Synopsis	`int of_get_named_gpio_flags(const struct device_node np, const char list_name, int index, enum of_gpio_flags *flags)`
Description	Obtains a GPIO number from the DTS file and analyzes its GPIO properties.
Parameter	np: Device node where the target is obtained. propname: Name of the property that contains GPIO specifier(s). index: Index of the GPIO flags: Enumerate of_gpio_flags variables, including IO configuration, pull-up and pull-down settings, and drive strength settings.
Return	Success: The GPIO index number Failure: Error code