ESP32 WROVER + JLINK OpenOCD problems

[vard]

Hi guys,

I’ve been trying for the past few days to get the debug working on an ESP32 WROVER with a JLINK, and for the life of me, I can’t get the system to program.

Here’s what I get:

Open On-Chip Debugger 0.9.0 (2017-05-09)
Licensed under GNU GPL v2
For bug reports, read
http://openocd.org/doc/doxygen/bugs.html
Info : auto-selecting first available session transport “jtag”. To override use ‘transport select <transport>’.
adapter speed: 3000 kHz
Info : No device selected, using first device.
Info : J-Link ARM V8 compiled Nov 28 2014 13:44:46
Info : Hardware version: 8.00
Info : VTarget = 1.436 V
Info : clock speed 3000 kHz
Error: JTAG scan chain interrogation failed: all ones
Error: Check JTAG interface, timings, target power, etc.
Error: Trying to use configured scan chain anyway…
Error: esp32.cpu0: IR capture error; saw 0x1f not 0x01
Warn : Bypassing JTAG setup events due to errors
Info : esp32.cpu0: Debug controller was reset (pwrstat=0xFF, after clear 0xFF).
Info : esp32.cpu0: Core was reset (pwrstat=0xFF, after clear 0xFF).
Info : esp32.cpu1: Debug controller was reset (pwrstat=0xFF, after clear 0xFF).
Info : esp32.cpu1: Core was reset (pwrstat=0xFF, after clear 0xFF).
Info : accepting ‘gdb’ connection on tcp/3333
Error: esp32.cpu0: xtensa_read_memory (line 823): DSR (FFFFFFFF) indicates target still busy!
Error: esp32.cpu0: xtensa_read_memory (line 823): DSR (FFFFFFFF) indicates DIR instruction generated an exception!
Error: esp32.cpu0: xtensa_read_memory (line 823): DSR (FFFFFFFF) indicates DIR instruction generated an overrun!
Warn : esp32.cpu0: Failed reading 4 bytes at address 0x00000000
Interrupt suppression during single-stepping is now enabled
Error: JTAG scan chain interrogation failed: all ones
Error: Check JTAG interface, timings, target power, etc.
Error: Trying to use configured scan chain anyway…
Error: esp32.cpu0: IR capture error; saw 0x1f not 0x01
Warn : Bypassing JTAG setup events due to errors
Error: timed out while waiting for target halted
TARGET: esp32.cpu0 – Not halted
in procedure ‘reset’
in procedure ‘ocd_bouncer’
Warn : esp32.cpu0: target not halted
Warn : target not halted

Error: JTAG scan chain interrogation failed: all ones
Error: Check JTAG interface, timings, target power, etc.
Error: Trying to use configured scan chain anyway…
Error: esp32.cpu0: IR capture error; saw 0x1f not 0x01
Warn : Bypassing JTAG setup events due to errors
Error: timed out while waiting for target halted
TARGET: esp32.cpu0 – Not halted
in procedure ‘reset’
in procedure ‘ocd_bouncer’
Warn : esp32.cpu0: target not halted
Warn : target not halted

Error: JTAG scan chain interrogation failed: all ones
Error: Check JTAG interface, timings, target power, etc.
Error: Trying to use configured scan chain anyway…
Error: esp32.cpu0: IR capture error; saw 0x1f not 0x01
Warn : Bypassing JTAG setup events due to errors
Error: timed out while waiting for target halted
TARGET: esp32.cpu0 – Not halted
in procedure ‘reset’
in procedure ‘ocd_bouncer’
Warn : esp32.cpu0: target not halted
Warn : target not halted

Info : dropped ‘gdb’ connection
Open On-Chip Debugger 0.9.0 (2017-05-09)
Licensed under GNU GPL v2
For bug reports, read
http://openocd.org/doc/doxygen/bugs.html
Info : auto-selecting first available session transport “jtag”. To override use ‘transport select <transport>’.
Info : No device selected, using first device.
Info : J-Link ARM V8 compiled Nov 28 2014 13:44:46
Info : Hardware version: 8.00
Info : VTarget = 1.436 V
jaylink: JTAG I/O operation failed: 01.
Error: jaylink_jtag_io() failed: JAYLINK_ERR_DEV.
Error: An adapter speed is not selected in the init script. Insert a call to adapter_khz or jtag_rclk to proceed.

 

 

Any suggestions or things to try out are highly appreciated.

Many thanks!

[support]

Hi,

According to the log, it looks like a hardware wiring problem. Please double-check all your wiring and use a logic analyzer to see if the JTAG signals are going through.

Another advice would be to get a board directly tested by us (e.g. Sparkfun ESP32-Thing ), get the debugging to work with it first and then switch over to ESP32-WROVER.

[vard]

Thank you kindly for your response, you were quite right, I had a connection problem indeed (broken wire inside the shrink tube of the test wire).

Found it with the logic analyzer, all is good now!

 

I can now run the ESP32 Demo as per your latest tutorial, picked up the LED blinky as suggested. The Jlink / OpenOCD seems to be working fine now, but I still have a couple of very quick questions:

1 – I get some messages in the GDB session window, and I’m too sure I understand what they mean:

Warning: could not set a breakpoint on main. ‘Step into new instance’ will not work.
Indeed, after loading the program, the debugger does not stop at main as I believe it should (I’ve got Stepping into new instance (F10) will stop in: main checked).

Cannot resolve the address of _estack. Skipping stack pointer validity check.

Obviously, if I un-check the box “Validate stack pointer when starting debugging”  the warning goes away, but I would still like to understand what it means.

Any suggestions?

 

2 – What is the maximum number of hardware breakpoints I can have with Jlink/OpenOCD on ESP32? I tried 3 breakpoints and the debugger crashed. I know I’m wasting a breakpoint stopping at main at start-up, I will un-check the stop at main box because the debugger never stops at main anyway, but I would still like to know the maximum number of breakpoints.

 

Thanks again for all the help and support!

 

[vard]

Please disregard question number 2 regarding the breakpoints, I read “LIMITATIONS OF THE ESP32 DEBUGGING”, 2 breakpoints (no wonder it was crashing at 3!).

Thanks!

• This reply was modified 7 years, 6 months ago by vard.

[support]

Hi,

The _estack message can be safely ignored. It refers to a mechanism that automatically checks for incorrect end-of-stack setting on ARM devices, however it does not work on ESP8266/ESP32 due to a different linker script layout.

[Author]

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