DLN_GPIO_GET_PORT_COUNT Command and Response

The DLN_GPIO_GET_PORT_COUNT command is used to retrieve the number of GPIO ports available in your DLN-series adapter.

DLN_GPIO_GET_PORT_COUNT Command

 typedef struct
 {
    DLN_MSG_HEADER header;
 } __PACKED_ATTR DLN_GPIO_GET_PORT_COUNT_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_GET_PORT_COUNT_CMD structure.
msgId	Identifies the message. For the DLN_GPIO_GET_PORT_COUNT command it must be set to 0x0100. You can use the DLN_MSG_ID_GPIO_GET_PORT_COUNT 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.

DLN_GPIO_GET_PORT_COUNT Response

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The adapter sends the DLN_GPIO_GET_PORT_COUNT response after the DLN_GPIO_GET_PORT_COUNT command execution. The response contains the available number of GPIO ports.

 typedef struct
 {
    DLN_MSG_HEADER header;
    DLN_RESULT result;
    uint8_t count;
 } __PACKED_ATTR DLN_GPIO_GET_PORT_COUNT_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_GET_PORT_COUNT_RSP structure.
msgId	Contains the message id. For the DLN_GPIO_GET_PORT_COUNT response it is set to 0x0100. The DLN_MSG_ID_GPIO_GET_PORT_COUNT 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.

result

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

Return Code	Description
DLN_RES_SUCCESS	Available number of the GPIO ports has been successfully obtained.

count

Contains the available number of GPIO ports.

DLN_GPIO_GET_PORT_COUNT Command and Response