现在我可以确定的是硬件电路应该没有问题，我用keil写了个点灯可以正常下载正常在线debug。但是用Truestudio跑STM32CubeMX生成的工程时出现如下报错：
STMicroelectronics ST-LINK GDB server. Version 5.1.0
Copyright (c) 2018, STMicroelectronics. All rights reserved.
Starting server with the following options:
Persistent Mode : Disabled
Logging Level : 1
Listen Port Number : 61234
Status Refresh Delay : 15s
Verbose Mode : Disabled
SWD Debug : Enabled
Waiting for debugger connection...
Debugger connected
-------------------------------------------------------------------
STM32CubeProgrammer v1.3.0
-------------------------------------------------------------------
Log output file: C:\Users\think\AppData\Local\Temp\STM32CubeProgrammer_a05256.log
ST-LINK SN : 50FF6C066686575026510487
ST-LINK FW : V2J37S7
Voltage : 3.23V
SWD freq : 4000 KHz
Connect mode: Under Reset
Reset mode : Hardware reset
Device ID : 0x441
Device name : STM32F412
Device type : MCU
Device CPU : Cortex-M4
Memory Programming ...
Opening and parsing file: C:\Users\think\AppData\Local\Temp\ST-LINK_GDB_server_a05256.srec
File : C:\Users\think\AppData\Local\Temp\ST-LINK_GDB_server_a05256.srec
Size : 81264 Bytes
Address : 0x08000000
Erasing memory corresponding to segment 0:
Erasing internal memory sectors [0 4]
Download in Progress:
File download complete
Time elapsed during download operation: 00:00:02.454
Verifying ...
Download verified successfully
Target is not responding, retrying...
Target is not responding, retrying...
Target is not responding, retrying...
Target is not responding, retrying...
Target is not responding, retrying...
Target is not responding, retrying...
Target is not responding, retrying...
Target is not responding, retrying...
Target is not responding, retrying...
Target is not responding, retrying...
Error! Failed to read target status
Debugger connection lost.
Shutting down...
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