SEGGER J-Link Commander V7.56a (Compiled Oct 11 2021 16:33:05)
DLL version V7.56a, compiled Oct 11 2021 16:31:49
Connecting to J-Link via USB...O.K.
Firmware: J-Link V11 compiled Oct 6 2021 11:22:15
Hardware version: V11.00
S/N: 51016718
License(s): GDB
VTref=4.914V
Type "connect" to establish a target connection, '?' for help
J-Link>connect
Please specify device / core. <Default>: RISC-V
Type '?' for selection dialog
Device>
Please specify target interface:
J) JTAG (Default)
S) SWD
T) cJTAG
TIF>j
Device position in JTAG chain (IRPre,DRPre) <Default>: -1,-1 => Auto-detect
JTAGConf>
Specify target interface speed [kHz]. <Default>: 4000 kHz
Speed>
Device "RISC-V" selected.
Connecting to target via JTAG
ConfigTargetSettings() start
ConfigTargetSettings() end
TotalIRLen = ?, IRPrint = 0x..000000000000000000000001
ConfigTargetSettings() start
ConfigTargetSettings() end
TotalIRLen = ?, IRPrint = 0x..000000000000000000000001
ConfigTargetSettings() start
ConfigTargetSettings() end
TotalIRLen = ?, IRPrint = 0x..000000000000000000000001
ConfigTargetSettings() start
ConfigTargetSettings() end
TotalIRLen = ?, IRPrint = 0x..000000000000000000000001
Cannot connect to target.
J-Link>
能说的具体
这个是硬件的问题，TDI有个上拉电阻，阻值比较小，上拉比较强，所以与JLINK的信号有问题。去掉这个电阻就可以了。谢谢