DLN_I2C_MASTER_WRITE Command and Response

The DLN_I2C_MASTER_WRITE command is used to send the data via I2C interface.

DLN_I2C_MASTER_WRITE Command

 typedef struct
 {
    DLN_MSG_HEADER header;
    uint8_t port;
    uint8_t slaveDeviceAddress;
    uint8_t memoryAddressLength;
    uint32_t memoryAddress;
    uint16_t bufferLength;
    uint8_t buffer[256];
 } __PACKED_ATTR DLN_I2C_MASTER_WRITE_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_I2C_MASTER_WRITE_CMD structure.
msgId	Identifies the message. For the DLN_I2C_MASTER_WRITE command it must be set to 0x0306. You can use the DLN_MSG_ID_I2C_MASTER_WRITE 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.

port

A number of the I2C master port to be used.

slaveDeviceAddress

A 7-bit number, uniquely assigned to each I2C slave device.

memoryAddressLength

An internal address length. If set to zero, no internal address is sent.

memoryAddress

An internal I2C slave device address.

bufferLength

The size of the message buffer in bytes. This value must fall witin the range from 1 to 256.

buffer

A 256-element array. Each of the elements is an 8-bit value. The buffer contains the information to be sent to a slave. The buffer size must not exceed 256 bytes.

DLN_I2C_MASTER_WRITE Response

Go to command

The adapter sends the DLN_I2C_MASTER_WRITE response after the DLN_I2C_MASTER_WRITE command execution. The result fields informs a user if the data were successfully written.

 typedef struct
 {
    DLN_MSG_HEADER header;
    DLN_RESULT result;
 } __PACKED_ATTR DLN_I2C_MASTER_WRITE_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_I2C_MASTER_WRITE_RSP structure.
msgId	Contains the message id. For the DLN_I2C_MASTER_WRITE response it is set to 0x0306. The DLN_MSG_ID_I2C_MASTER_WRITE 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_I2C_MASTER_WRITE command DLN-series adapter can return the following result values:

Return Code	Description
DLN_RES_SUCCESS	An I2C data writing completed successfully.

DLN_I2C_MASTER_WRITE Command and Response