I am using a Sparkfun Thing board ( https://cdn.sparkfun.com/datasheets/Wir ... _Thing.pdf ), and writing code from within MS Visual Studio + GDB, debug method via XtensaOCD or OpenOCD.
I attached a Segger J-Link ( https://www.segger.com/jlink-debug-probes.html ) to the Sparkfun Thing board, but can't detect the CPU core.
JTAG signal TMS ==> ESP8266 pin 14
JTAG signal TDI ==> ESP8266 pin 12
JTAG signal TCK ==> ESP8266 pin 13
JTAG signal TDO ==> ESP8266 pin 15 (after removing R17 pull-down on SparkFun Thing board)
JTAG signal RST ==> ESP8266 pin RST (DTR line on SparkFun Thing board)
Btw, why is GPIO15/MTDO pulled down on the SparkFun Thing board?
I would appreciate any guidance on this topic.
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