DLN_GPIO_PIN_GET_EVENT_CFG Command and Response

The DLN_GPIO_PIN_GET_EVENT_CFG command is used to retrieve currently set event generation conditions for the specified pin.

DLN_GPIO_PIN_GET_EVENT_CFG Command

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 typedef struct
 {
    DLN_MSG_HEADER header;
    uint8_t pin;
 } __PACKED_ATTR DLN_GPIO_PIN_GET_EVENT_CFG_CMD;

Parameters:

header

Defines the DLN message header DLN_MSG_HEADER. The header contains several predefined fields and is used to identify and route messages. You must fill the following fields before sending the command:

Field	Description
size	The size of the message. Must be equal to the size of the DLN_GPIO_PIN_GET_EVENT_CFG_CMD structure.
msgId	Identifies the message. For the DLN_GPIO_PIN_GET_EVENT_CFG command it must be set to 0x011F. You can use the DLN_MSG_ID_GPIO_PIN_GET_EVENT_CFG constant.
echoCounter	Can be used to link a command to a response. The response will have the same echoCounter value. This field can be any numerical value from 0 to 0xFFFF (65536).
handle	A handle to the DLN-series adapter.

Pin

A number of the pin to retrieve the information from.

DLN_GPIO_PIN_GET_EVENT_CFG Response

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The adapter sends the DLN_GPIO_PIN_GET_EVENT_CFG response after the DLN_GPIO_PIN_GET_EVENT_CFG command execution. The response contains currently set event generation conditions for the specified pin.

 typedef struct
 {
    DLN_MSG_HEADER header;
    DLN_RESULT result;
    uint8_t pin;
    uint8_t eventType;
    uint16_t eventPeriod;
 } __PACKED_ATTR DLN_GPIO_PIN_GET_EVENT_CFG_RSP;

Parameters:

header

Defines the DLN message header DLN_MSG_HEADER. The response header contains the following fields:

Field	Description
size	The size of the message. It is equal to the size of the DLN_GPIO_PIN_GET_EVENT_CFG_RSP structure.
msgId	Contains the message id. For the DLN_GPIO_PIN_GET_EVENT_CFG response it is set to 0x011F. The DLN_MSG_ID_GPIO_PIN_GET_EVENT_CFG constant can be used to check the message ID.
echoCounter	Links a command to a response. The echoCounter value is copied from the respective command header.
handle	A handle to the DLN-series adapter. You can use the handle field to determine the adapter that have sent the response.

pin

Contains a number of the pin.

result

Contains the result of the command execution. For DLN_GPIO_PIN_GET_EVENT_CFG command DLN-series adapter can return the following result values:

Return Code	Description
DLN_RES_SUCCESS	Currently set event generation conditions for the pin have been successfully retrieved.
DLN_RES_INVALID_PIN_NUMBER	Invalid pin number was specified.

eventType

Contains the event generation condition for the pin. The following values are available:

Value	Description
0 or DLN_GPIO_EVENT_NONE	No events are generated for the current pin.
1 or DLN_GPIO_EVENT_CHANGE	Events are generated when the level on the digital input line changes.
2 or DLN_GPIO_EVENT_LEVEL_HIGH	Events are generated when high level (logical 1) is detected on the digital input line.
3 or DLN_GPIO_EVENT_LEVEL_LOW	Events are generated when low level (logical 1) is detected on the digital input line.
4 or DLN_GPIO_EVENT_LEVEL_ALWAYS	Events are sent periodically with predefined repeat interval. The non-zero interval must be specified for this event type.

For more detailed information see GPIO Events

eventPeriod

Contains the repeat interval for DLN_GPIO_CONDIION_MET_EV event generation on the pin. The repeat interval is set in ms (1 to 65,535ms). If the repeat interval is set to 0, the device will send a single event when the level on the line changes to meet the specified conditions.

DLN_GPIO_PIN_GET_EVENT_CFG Command and Response