arsd.gpio

PRERELEASE EXPERIMENTAL MODULE / SUBJECT TO CHANGE WITHOUT WARNING / LIKELY TO CONTAIN BUGS

Wrapper for gpio use on Linux. It uses the new kernel interface directly, and thus requires a Linux kernel version newer than 4.9. It also requires a Linux kernel newer than 4.9 (apt upgrade your raspian install if you don't already have that).

Note that the kernel documentation is very clear: do NOT use this for anything you plan to distribute to others. It is really just for tinkering, not production. And if the kernel people say that, I say it like 1000x more.

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Members

Classes

CErrorException class CErrorException

Enums

GPIOLINE_CHANGED_REQUESTED anonymousenum GPIOLINE_CHANGED_REQUESTED: line status change events

Manifest constants

GPIOEVENT_EVENT_FALLING_EDGE enum GPIOEVENT_EVENT_FALLING_EDGE;: GPIO event types
GPIOEVENT_EVENT_RISING_EDGE enum GPIOEVENT_EVENT_RISING_EDGE;: GPIO event types
GPIOEVENT_REQUEST_BOTH_EDGES enum GPIOEVENT_REQUEST_BOTH_EDGES;
GPIOEVENT_REQUEST_FALLING_EDGE enum GPIOEVENT_REQUEST_FALLING_EDGE;: Eventrequest flags
GPIOEVENT_REQUEST_RISING_EDGE enum GPIOEVENT_REQUEST_RISING_EDGE;: Eventrequest flags
GPIOHANDLES_MAX enum GPIOHANDLES_MAX;: Maximum number of requested handles
GPIOHANDLE_GET_LINE_VALUES_IOCTL enum GPIOHANDLE_GET_LINE_VALUES_IOCTL;: .
GPIOHANDLE_REQUEST_ACTIVE_LOW enum GPIOHANDLE_REQUEST_ACTIVE_LOW;
GPIOHANDLE_REQUEST_BIAS_DISABLE enum GPIOHANDLE_REQUEST_BIAS_DISABLE;
GPIOHANDLE_REQUEST_BIAS_PULL_DOWN enum GPIOHANDLE_REQUEST_BIAS_PULL_DOWN;
GPIOHANDLE_REQUEST_BIAS_PULL_UP enum GPIOHANDLE_REQUEST_BIAS_PULL_UP;: Linerequest flags
GPIOHANDLE_REQUEST_INPUT enum GPIOHANDLE_REQUEST_INPUT;
GPIOHANDLE_REQUEST_OPEN_DRAIN enum GPIOHANDLE_REQUEST_OPEN_DRAIN;
GPIOHANDLE_REQUEST_OPEN_SOURCE enum GPIOHANDLE_REQUEST_OPEN_SOURCE;
GPIOHANDLE_REQUEST_OUTPUT enum GPIOHANDLE_REQUEST_OUTPUT;: Linerequest flags
GPIOHANDLE_SET_CONFIG_IOCTL enum GPIOHANDLE_SET_CONFIG_IOCTL;
GPIOHANDLE_SET_LINE_VALUES_IOCTL enum GPIOHANDLE_SET_LINE_VALUES_IOCTL;: .
GPIOLINE_FLAG_ACTIVE_LOW enum GPIOLINE_FLAG_ACTIVE_LOW;
GPIOLINE_FLAG_BIAS_DISABLE enum GPIOLINE_FLAG_BIAS_DISABLE;
GPIOLINE_FLAG_BIAS_PULL_DOWN enum GPIOLINE_FLAG_BIAS_PULL_DOWN;
GPIOLINE_FLAG_BIAS_PULL_UP enum GPIOLINE_FLAG_BIAS_PULL_UP;
GPIOLINE_FLAG_IS_OUT enum GPIOLINE_FLAG_IS_OUT;: Informational flags
GPIOLINE_FLAG_KERNEL enum GPIOLINE_FLAG_KERNEL;
GPIOLINE_FLAG_OPEN_DRAIN enum GPIOLINE_FLAG_OPEN_DRAIN;
GPIOLINE_FLAG_OPEN_SOURCE enum GPIOLINE_FLAG_OPEN_SOURCE;: Informational flags
GPIO_GET_CHIPINFO_IOCTL enum GPIO_GET_CHIPINFO_IOCTL;
GPIO_GET_LINEEVENT_IOCTL enum GPIO_GET_LINEEVENT_IOCTL;
GPIO_GET_LINEHANDLE_IOCTL enum GPIO_GET_LINEHANDLE_IOCTL;
GPIO_GET_LINEINFO_IOCTL enum GPIO_GET_LINEINFO_IOCTL;
GPIO_GET_LINEINFO_UNWATCH_IOCTL enum GPIO_GET_LINEINFO_UNWATCH_IOCTL;
GPIO_GET_LINEINFO_WATCH_IOCTL enum GPIO_GET_LINEINFO_WATCH_IOCTL;: .

Structs

GpioChip struct GpioChip
gpiochip_info struct gpiochip_info: Information about a certain GPIO chip. ioctl GPIO_GET_CHIPINFO_IOCTL
gpioevent_data struct gpioevent_data: The actual event being pushed to userspace
gpioevent_request struct gpioevent_request: Information about a GPIO event request
gpiohandle_config struct gpiohandle_config: Configuration for a GPIO handle request Note: only in kernel newer than early 2020
gpiohandle_data struct gpiohandle_data: Information of values on a GPIO handle
gpiohandle_request struct gpiohandle_request: Information about a GPIO handle request
gpioline_info struct gpioline_info: Information about a certain GPIO line
gpioline_info_changed struct gpioline_info_changed: Information about a change in status of a GPIO line

Detailed Description

This is a PRERELEASE EXPERIMENTAL MODULE SUBJECT TO CHANGE WITHOUT WARNING. It is LIKELY TO CONTAIN BUGS!

GPIOHANDLE_REQUEST_BIAS_PULL_UP and friends were added to the kernel in early 2020, so bleeding edge feature that is unlikely to work if you aren't that new too. My rpis do NOT support it. (the python library sets similar values tho by poking memory registers. I'm not gonna do that here, you can also solve it with electric circuit design (6k-ish ohm pull up and/or pull down resistor) or just knowing your own setup... so meh.)

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