Persistent state used by the GPIO polling helpers. More...

#include <mcp2221_gpio_poll.h>

Public Attributes
int	prev [4]
	Previous GP0 through GP3 samples. More...

int	initialized
	Nonzero after the first successful poll has initialized prev. More...

double	last_time
	Wall-clock timestamp of the previous successful GPIO poll. More...

uint16_t	filter_mask
	Persistent edge-event filter mask. More...

Detailed Description

Persistent state used by the GPIO polling helpers.

Initialize this structure with mcp2221_gpio_poll_init() before its first use. Applications should treat the members as polling state and avoid modifying them directly except through the public helper functions.

Definition at line 47 of file mcp2221_gpio_poll.h.

Member Data Documentation

◆ filter_mask

uint16_t mcp2221_gpio_poll_state_t::filter_mask

Persistent edge-event filter mask.

A value of 0 accepts all events. Otherwise the mask uses alternating rise/fall bits for GP0 through GP3 as produced by MCP2221_GPIO_POLL_MASK_RISE() and MCP2221_GPIO_POLL_MASK_FALL().

Definition at line 74 of file mcp2221_gpio_poll.h.

◆ initialized

int mcp2221_gpio_poll_state_t::initialized

Nonzero after the first successful poll has initialized prev.

Definition at line 57 of file mcp2221_gpio_poll.h.

◆ last_time

double mcp2221_gpio_poll_state_t::last_time

Wall-clock timestamp of the previous successful GPIO poll.

Both mcp2221_gpio_poll() and mcp2221_gpio_poll_events() update this timestamp so the same state object can be shared between the helpers.

Definition at line 65 of file mcp2221_gpio_poll.h.

◆ prev

int mcp2221_gpio_poll_state_t::prev[4]

Previous GP0 through GP3 samples.

Entries are maintained by the polling functions. A value of -1 represents a pin that was not configured as GPIO.

Definition at line 54 of file mcp2221_gpio_poll.h.

The documentation for this struct was generated from the following file: