ESP32 Forum

Posted: **Sun Jul 23, 2017 6:15 pm**

I am getting started on my ESP32 development and have just installed OpenOCD. I can't seem to access to esp108, see attached. What is the issue here, how to resolve? I am guessing it is not built in the OpenOCD directory (~/esp/openocd-esp32/), or it is not on PATH.

Posted: **Sun Jul 23, 2017 7:29 pm**

Hi justinmreina,

I do not see the command you have used to call OpenOCD. It should look as follows:

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$ src/openocd -s tcl -f interface/ftdi/esp32_devkitj_v1.cfg -f board/esp-wroom-32.cfg

You may need to adjust configuration files after "-f" to match your specifc h/w.

If done correctly you should see:

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krzysztof@TK-HP:~/esp/openocd-esp32$ src/openocd -s tcl -f interface/ftdi/esp32_devkitj_v1.cfg -f board/esp-wroom-32.cfg
Open On-Chip Debugger 0.10.0-dev-gb5ec731 (2017-07-23-21:18)
Licensed under GNU GPL v2
For bug reports, read
	http://openocd.org/doc/doxygen/bugs.html
none separate
adapter speed: 20000 kHz
force hard breakpoints
Info : ftdi: if you experience problems at higher adapter clocks, try the command "ftdi_tdo_sample_edge falling"
Info : clock speed 20000 kHz
Info : JTAG tap: esp32.cpu0 tap/device found: 0x120034e5 (mfg: 0x272 (Tensilica), part: 0x2003, ver: 0x1)
Info : JTAG tap: esp32.cpu1 tap/device found: 0x120034e5 (mfg: 0x272 (Tensilica), part: 0x2003, ver: 0x1)
Info : Target halted. PRO_CPU: PC=0x40080F80 (active)    APP_CPU: PC=0x400D0F58

Posted: **Mon Jul 24, 2017 2:32 pm**

this works, thank you

!!

Original
See attached 'JTAG Installation Process - Jmr.txt':26 for the originally applied command -

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./src/openocd -s ./tcl -f ./esp32.cfg

Command Used
Here was my applied command (DevKitC Board, Segger J-Link EDU Programmer). Note that the unit connection was not successful, but the JTAG connection to my programmer was, mission accomplished!

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./src/openocd -s tcl -f interface/jlink.cfg -f board/esp-wroom-32.cfg

Response

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	jmreina@jmreina-ubuntu:~/openocd-esp32$ ./src/openocd -s tcl -f interface/jlink.cfg -f board/esp-wroom-32.cfg
	Open On-Chip Debugger 0.10.0-dev-gb5ec731 (2017-07-21-19:20)
	Licensed under GNU GPL v2
	For bug reports, read
		http://openocd.org/doc/doxygen/bugs.html
	adapter speed: 20000 kHz
	force hard breakpoints
	Info : No device selected, using first device.
	Info : J-Link V9 compiled Dec 16 2016 15:34:10
	Info : Hardware version: 9.40
	Info : VTarget = 0.000 V
	Info : Reduced speed from 20000 kHz to 15000 kHz (maximum).
	Info : Reduced speed from 20000 kHz to 15000 kHz (maximum).
	Info : clock speed 20000 kHz
	Error: JTAG scan chain interrogation failed: all zeroes
	Error: Check JTAG interface, timings, target power, etc.
	Error: Trying to use configured scan chain anyway...
	Error: esp32.cpu0: IR capture error; saw 0x00 not 0x01
	Warn : Bypassing JTAG setup events due to errors
	Error: cpu0: esp32_fetch_all_regs (line 163): DSR (FFFFFFFF) indicates target still busy!
	Error: cpu0: esp32_fetch_all_regs (line 163): DSR (FFFFFFFF) indicates DIR instruction generated an exception!
	Error: cpu0: esp32_fetch_all_regs (line 163): DSR (FFFFFFFF) indicates DIR instruction generated an overrun!
	Error: cpu0: esp32_fetch_all_regs (line 190): DSR (FFFFFFFF) indicates target still busy!
	Error: cpu0: esp32_fetch_all_regs (line 190): DSR (FFFFFFFF) indicates DIR instruction generated an exception!
	Error: cpu0: esp32_fetch_all_regs (line 190): DSR (FFFFFFFF) indicates DIR instruction generated an overrun!
	Error: Exception reading pc!

	Info : Target halted. PRO_CPU: PC=0x00000000             APP_CPU: PC=0x00000000 (active)
	Error: cpu0: xtensa_write_memory (line 696): DSR (FFFFFFFF) indicates target still busy!
	Error: cpu0: xtensa_write_memory (line 696): DSR (FFFFFFFF) indicates DIR instruction generated an exception!
	Error: cpu0: xtensa_write_memory (line 696): DSR (FFFFFFFF) indicates DIR instruction generated an overrun!
	Warn : esp32: Failed writing 4 bytes at address 0x3FF5F064, data - a1, 3a, d8, 50, a1, 3a, d8, 50
	embedded:startup.tcl:21: Error: 
	in procedure 'init' 
	in procedure 'ocd_bouncer' 
	in procedure 'flash' 
	in procedure 'ocd_bouncer' 
	in procedure 'esp_core_halt' 
	in procedure 'esp32' called at file "tcl/target/esp32.cfg", line 37
	in procedure 'ocd_bouncer' 
	at file "embedded:startup.tcl", line 21

	Info : esp32: Debug controller was reset (pwrstat=0xFF, after clear 0xFF).
	Info : esp32: Core was reset (pwrstat=0xFF, after clear 0xFF).

OpenOCD installation issues post - Suppl.zip: See attached for all of the ref & debug content I used to work to solution!; (468.09 KiB) Downloaded 598 times

Posted: **Mon Jul 24, 2017 4:00 pm**

I am happy to see you are progressing!

Configuration files have changed with latest release of OpenOCD and "jtag_debugging_for_esp32_en.pdf v1.0" is not updated to reflect these changes.

Regarding the error log, it looks like communication speed or wiring problem:

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Info : Reduced speed from 20000 kHz to 15000 kHz (maximum).
Info : clock speed 20000 kHz
Error: JTAG scan chain interrogation failed: all zeroes
Error: Check JTAG interface, timings, target power, etc.

Basing on command to start OpenOCD I assume you are using an external JTAG adapter. In such case it is unlikely to achieve communication at 20 MHz.

If not done already I would reduce the speed several times (in range 10x - 100x depending on the cable length) by changing the following line in configuration:

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adapter_khz 20000

If the issue persists then check the wiring.

If the wiring looks correct:
- post a photo of your set up,
- specify types of ESP32 board & JTAG interface used,
- provide a list how the pins of JTAG interface and ESP32 module are connected.

Posted: **Tue Jul 25, 2017 6:16 pm**

Hi krzychb,
Thank you 20kHz works! The J-Link successfully connects now but JTAG is not established to my ESP32. Here is my hardware setup -

Setup
Board: Espressif DevKit-C
JTAG: Segger J-Link EDU
OS: Ubuntu 16.04 (Virtualbox, Win10 PC)

Here is what I see in response (see 'JTAG Response.pdf' for full response) -

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jmreina@jmreina-ubuntu:~/esp/openocd-esp32$ ./src/openocd -s tcl -f interface/jlink.cfg -f
board/esp-wroom-32.cfg
Open On-Chip Debugger 0.10.0-dev-gb5ec731 (2017-07-23-10:57)
Licensed under GNU GPL v2
For bug reports, read
http://openocd.org/doc/doxygen/bugs.html
adapter speed: 20 kHz
force hard breakpoints
Info : No device selected, using first device.
Info : J-Link V9 compiled Dec 16 2016 15:34:10
Info : Hardware version: 9.40
Info : VTarget = 3.316 V
Info : clock speed 20 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: Debug controller was reset (pwrstat=0xFF, after clear 0xFF).
Info : esp32: Core was reset (pwrstat=0xFF, after clear 0xFF).

Thoughts? What is missing? Why does it say "Info : No device selected, using first device", how to specify the device?

Thanks for your help here!

Posted: **Wed Jul 26, 2017 10:27 am**

HI justinmreina,

You are clearly almost there.

I am not sure about wiring:

1. I would not connect 3.3V between ESP32 and Segger J-Link. ESP32 should be powered through own USB
2. From the pictures you posted it looks like one of lines is connected to GPIO27 while GPIO12 is not connected

Please see below set-up that I have just tested and works correctly.

All wires are about 10 cm long. In fact in this setup it is working with "adapter_khz" at 26 MHz that is maximum discussed in documentation. I have tested it for about 2h transmitting application traces as described in http://esp-idf.readthedocs.io/en/latest ... trace.html

: Connection of JTAG interface to ESP32 DevKitC; esp32-devkitc-olimex-arm-usb-ocd-h-jtag.png (303.79 KiB) Viewed 14048 times

: Example wiring of Olimex ARM-USB-OCD-H JTAG to ESP32 DevKitC; IMG_3441.JPG (1.43 MiB) Viewed 14056 times

Posted: **Thu Jul 27, 2017 12:50 am**

It works now, thank you!! It did require connection of VCC to the JTAG for successful connection, and then ready to go!

That graphic you shared, wow this is good content. I've encapsulated it into my wiring write-up, quite useful here see attached!

Posted: **Thu Jul 27, 2017 1:06 am**

My setup is almost complete in Eclipse, very eager to get started in dev. I've got one last step here, debugging. Is there a good 'hello world' ref to GDB/Eclipse debugging for the ESP32?

Known ESP-IDF Debugging Ref
- ESP-IDF: Docs » API Guides » Debugging

Debugging Goals
- HW/SW Code Breakpoints
- Code Stepping
- Register R/W

Each time I dive into the posted instructions, I get a bit intimidated and back down. What is the easy way to get started here?

Posted: **Sat Jul 29, 2017 3:52 am**

any thoughts or ideas here? If anyone has anything toss it up and I'll dive in, with full report back in response!

Posted: **Sat Jul 29, 2017 6:23 am**

Please check the updated guide for setting up JTAG debugging for ESP32 in Eclipse: http://esp-idf.readthedocs.io/en/latest ... er-eclipse and the debugging examples section: http://esp-idf.readthedocs.io/en/latest ... es-eclipse

ESP32 Forum

OpenOCD installation issues, can't find 'esp108'

OpenOCD installation issues, can't find 'esp108'

Re: OpenOCD installation issues, can't find 'esp108'

Re: OpenOCD installation issues, can't find 'esp108'

Re: OpenOCD installation issues, can't find 'esp108'

Re: OpenOCD installation issues, can't find 'esp108'

Re: OpenOCD installation issues, can't find 'esp108'

Re: OpenOCD installation issues, can't find 'esp108'

Re: OpenOCD installation issues, can't find 'esp108'

Re: OpenOCD installation issues, can't find 'esp108'

Re: OpenOCD installation issues, can't find 'esp108'