The header file for low-speed data channel related functions is dji_low_speed_data_channel.h. This document describes the key information and usage of the structure and function prototypes in the dji_low_speed_data_channel.h file.

Catalog

• Define, Enum and Struct
  DjiLowSpeedDataChannelRecvDataCallback

• Function
  DjiLowSpeedDataChannel_Init
  DjiLowSpeedDataChannel_DeInit
  DjiLowSpeedDataChannel_SendData
  DjiLowSpeedDataChannel_GetSendDataState
  DjiLowSpeedDataChannel_RegRecvDataCallback

Definition, Enum and Struct

typedef function DjiLowSpeedDataChannelRecvDataCallback

Function:Prototype of callback function used to receive data that come from selected channel address.

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typedef T_DjiReturnCode (*DjiLowSpeedDataChannelRecvDataCallback)(const uint8_t *data, uint16_t len);

Parameter
data：pointer to data.
len：length of data.
Return
The details for the return code please refer to: DjiErrorCode

Function

function DjiLowSpeedDataChannel_Init

Function:Initialize the low speed data channel module.

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T_DjiReturnCode DjiLowSpeedDataChannel_Init(void);

Return
The details for the return code please refer to: DjiErrorCode

function DjiLowSpeedDataChannel_DeInit

Function:Deinitialize the low speed data channel module.

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T_DjiReturnCode DjiLowSpeedDataChannel_DeInit(void);

Return
The details for the return code please refer to: DjiErrorCode

function DjiLowSpeedDataChannel_SendData

Function:Send data to selected channel address end via command channel.

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T_DjiReturnCode DjiLowSpeedDataChannel_SendData(E_DjiChannelAddress channelAddress, const uint8_t *data,
                                                uint8_t len);

Parameter
channelAddress：the channel address of the low speed channel
data：pointer to data to be sent.
len：length of data to be sent, unit: byte.
Return
The details for the return code please refer to: DjiErrorCode

function DjiLowSpeedDataChannel_GetSendDataState

Get data transmission state of "sendToOsdk" command channel. User can use the state as base for controlling data transmission between selected channel address and onboard computer.

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T_DjiReturnCode DjiLowSpeedDataChannel_GetSendDataState(E_DjiChannelAddress channelAddress,
                                                        T_DjiDataChannelState *state);

Parameter
channelAddress：the channel address of the low speed channel
state：pointer to low speed channel state.
Return
The details for the return code please refer to: DjiErrorCode

function DjiLowSpeedDataChannel_RegRecvDataCallback

Function:Register callback function used to receive data from selected channel address. After registering this callback function, callback function will be called automatically when system receive data from selected channel address.

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T_DjiReturnCode DjiLowSpeedDataChannel_RegRecvDataCallback(E_DjiChannelAddress channelAddress,
                                                           DjiLowSpeedDataChannelRecvDataCallback callback);

Parameter
channelAddress：the channel address of the low speed channel
callback：pointer to callback function.
Return
The details for the return code please refer to: DjiErrorCode