GPIO Structures

This section describes the structures used for the GPIO module. These structures are declared in the dln_gpio.h file.

Rating:

DLN_GPIO_PIN_EVENT_TYPES Structure

The DLN_GPIO_PIN_EVENT_TYPES structure contains information about the event types supported for a pin.

Syntax

C/C++

typedef struct
{
	uint8_t count;
	uint8_t eventTypes[8];
} __PACKED_ATTR DLN_GPIO_PIN_EVENT_TYPES;

Structure Members

count: The number of available event types.
eventTypes: An 8-element array. Each element corresponds to one of the supported event types.

DLN_GPIO_PIN_CONFIG Structure

The DLN_GPIO_PIN_CONFIG structure contains information about the pin configuration.

Syntax

C/C++

typedef struct
{
    uint16_t cfg;
    uint8_t eventType;	
    uint16_t eventPeriod;
} __PACKED_ATTR DLN_GPIO_PIN_CONFIG;

Structure Members

cfg

A bit field that defines the pin configuration and consists of 16 bits. Each of the bits 0-6, 8-9 corresponds to a specific parameter, that defines the pin configuration. The bits 7, 10-15 are reserved.


Bit	Value	Description	Constant
0	0	The pin is not configured as a GPIO.	DLN_GPIO_DISABLED
0	1	The pin is configured as a GPIO.	DLN_GPIO_ENABLED
1	0	The pin is an input.	DLN_GPIO_INPUT
1	1	The pin is an output.	DLN_GPIO_OUTPUT
2	0	The output value is 0.	DLN_GPIO_OUTPUT_VAL_0
2	1	The output value is 1.	DLN_GPIO_OUTPUT_VAL_1
3	0	The output is open drain.	DLN_GPIO_OPEN_DRAIN_DISABLED
3	1	The output is push-pull.	DLN_GPIO_OPEN_DRAIN_ENABLED
4	0	The pull-up resistor is not active.	DLN_GPIO_PULLUP_DISABLED
4	1	The pull-up resistor is active.	DLN_GPIO_PULLUP_ENABLED
5	0	The debounce filter is not active.	DLN_GPIO_DEBOUNCE_DISABLED
5	1	The debounce filter is active.	DLN_GPIO_DEBOUNCE_ENABLED
6	0	The pull-down resistor is not active.	DLN_GPIO_PULLDOWN_DISABLED
6	1	The pull-down resistor is active.	DLN_GPIO_PULLDOWN_ENABLED
7		Reserved.
8	0	No events are generated.	DLN_GPIO_EVENT_DISABLED
8	1	Events are generated.	DLN_GPIO_EVENT_ENABLED
9	0	Single events are generated.	DLN_GPIO_EVENT_SINGLE
9	1	Periodical events are generated.	DLN_GPIO_EVENT_PERIODIC
10		Reserved.
11		Reserved.
12		Reserved.
13		Reserved.
14		Reserved.
15		Reserved.

eventType

A type of the event. The following values are available:


Value	Constant	Description
0	DLN_GPIO_EVENT_NONE	No events are generated.
1	DLN_GPIO_EVENT_CHANGE	Events are generated when the input value changes.
2	DLN_GPIO_EVENT_LEVEL_HIGH	Events are generated when the high level (logic 1) is detected.
3	DLN_GPIO_EVENT_LEVEL_LOW	Events are generated when the low level (logic 0) is detected.
4	DLN_GPIO_EVENT_ALWAYS	The events are generated periodically with the predefined interval.

For detailed information, read Digital Input Events [1].

eventPeriod

An interval in milliseconds (ms) at which the events are generated. If the interval is zero, the DLN adapter generates a single event when the level change meets the specified conditions.