回复 郝呵呵 ：从LOG上来看就是USB没有跟M300通信成功造成lost问题，建议还是把实际的硬件连接图发出来看看。

回复 张小龙 ：RT 在四楼

接线是按照你之前发的帖子，如何制作osdk转接板接的。 我自己画的板子使用f405芯片，板子做从机接入电脑验证过了，硬件没有问题。 合入osdk后调试usb部分usb可以建立连接， 但是log显示： [19:05:02.707] [2.777]STATUS/1 @ DJI::OSDK::Vehicle::parseDroneVersionInfo, L1157: Device Serial No. = 1ZNDH3L0011253 [2.795]STATUS/1 @ DJI::OSDK::Vehicle::parseDroneVersionInfo, L1159: Firmware = 3.4.8.44 [2.811]STATUS/1 @ DJI::OSDK::Vehicle::functionalSetUp, L315: Shake hand with drone successfully by getting drone version. [19:05:02.769] [2.836]STATUS/1 @ DJI::OSDK::Vehicle::activate, L1349: osdk policy file updating(1) ...... [19:05:03.763] [3.835]STATUS/1 @ DJI::OSDK::Vehicle::sendHeartbeatToFCTask, L1483: OSDK send heart beat to fc task created. [19:05:05.825] [5.896]STATUS/1 @ DJI::OSDK::Vehicle::fcLostConnectCallBack, L1439: OSDK lost connection with Drone! [19:05:06.788] [6.854][module_command]-[Info]-[OsdkCommand_SendPoll:838]Command async send retry:1 3 [19:05:06.850] [6.919]STATUS/1 @ DJI::OSDK::Vehicle::fcLostConnectCallBack, L1439: OSDK lost connection with Drone! [6.937][module_protocol]-[Warn]-[OsdkProtocol_sdkUnpack:372]Unpack error:unknown ack session id [6.955][module_channel]-[Info]-[OsdkChannel_RecvProcess:668]protocol unpack error [19:05:07.354] [7.425][module_command]-[Info]-[OsdkCommand_SendPoll:838]Command async send retry:2 2 [19:05:07.385] [7.455]STATUS/1 @ DJI::OSDK::Vehicle::fcLostConnectCallBack, L1439: OSDK lost connection with Drone! [19:05:08.388] [8.455]STATUS/1 @ DJI::OSDK::Vehicle::fcLostConnectCallBack, L1439: OSDK lost connection with Drone! [19:05:09.426] [9.498]STATUS/1 @ DJI::OSDK::Vehicle::fcLostConnectCallBack, L1439: OSDK lost connection with Drone! [9.516]STATUS/1 @ DJI::OSDK::Vehicle::fcLostConnectCallBack, L1439: OSDK lost connection with Drone! [19:05:09.795] [9.861][module_command]-[Info]-[OsdkCommand_SendPoll:838]Command async send retry:1 2 [19:05:10.479] [10.540]STATUS/1 @ DJI::OSDK::Vehicle::fcLostConnectCallBack, L1439: OSDK lost connection with Drone! [19:05:10.968] [11.039][module_command]-[Info]-[OsdkCommand_SendPoll:838]Command async send retry:2 2

建议把接线图发出来看看，还有log

另外三根线不不需要连接