TI中文支持网Error connecting to the target:
(Error -2131 @ 0x0)
Unable to access device register. Reset the device, and retry the operation. If error persists, confirm configuration, power-cycle the board, and/or try more reliable JTAG settings (e.g. lower TCLK).
(Emulation package 9.2.0.00002)
电阻R10没接，sop是010.JTAG线都对应连好了。芯片买回来直接用CCS随便一个wifi例程想下载一下试试，应该跟程序内容没关系。
Kevin Qiu1：
上面连接图不全，貌似自制模块没供电，VCC连接了吗
Viki Shi：
接法如下，具体请看如下文档的2.5.2 Using the XDS110 Debug Probe With a Different Target：
Header J4 follows the Cortex-M Arm standard; however, pin 1 is not a voltage sense pin. The XDS110 outputs only 3.3-V JTAG signals. If another voltage level is needed, the user must provide level shifters to translate the JTAG signal voltages.
1. Remove jumpers on the JTAG signals on the isolation block, including RST, TMS, TCK, TDO, and TDI.
2. Plug the 10-pin cable into J4, and connect to an external target.
a. J4 follows the Arm Cortex Debug Connector standard outlined in Cortex-M Debug Connectors.
3. Plug USB power into the LaunchPad development kit, or power it externally.
a. JTAG levels are 3.3-V ONLYwww.ti.com.cn/…/swru463c.pdf
user6390304：
回复 Kevin Qiu1:
接了，3.3V,电源在板子上电后就测过了
user6390304：
回复 Viki Shi:
意思是不要让我从隔离带直接引线，要从J4引线吗？可是这些引脚是相通的啊
Kevin Qiu1：
回复 user6390304:
R10是0欧姆？
user6390304：
回复 Kevin Qiu1:
对，R10在板子上没有焊接
Kevin Qiu1：
回复 user6390304:
R9,R10,R11都没焊接的话，将R6和R8拆掉试试
user6390304：
回复 Kevin Qiu1:
我的R9和R11是焊接了的，只有R10没焊接
user6390304：
回复 Kevin Qiu1:
sop三个引脚电压都测过了，只有sop1是高电平3.3V，剩下的是0V
user6390304：
回复 Kevin Qiu1:
请问您还在帮我解决吗
