ESP32 Forum

Dear all,
I'm trying to connect with JTAG to ESP32-C3, using built in interface on USB pins. I connected this and I can see JTAG device in Windows USB device's list. But when I launch debugger with:

openocd -f board/esp32c3-builtin.cfg

This happens:

Open On-Chip Debugger v0.10.0-esp32-20210401 (2021-04-01-15:46)
Licensed under GNU GPL v2
For bug reports, read
http://openocd.org/doc/doxygen/bugs.html
Info : only one transport option; autoselect 'jtag'
Warn : Transport "jtag" was already selected
force hard breakpoints
Info : Listening on port 6666 for tcl connections
Info : Listening on port 4444 for telnet connections
Error: libusb_open() failed with LIBUSB_ERROR_NOT_SUPPORTED
Info : esp_usb_jtag: Device found. Base speed 40000KHz, div range 1 to 255
Info : clock speed 40000 kHz
Info : JTAG tap: esp32c3.cpu tap/device found: 0x00005c25 (mfg: 0x612 (Espressif Systems), part: 0x0005, ver: 0x0)
Info : datacount=2 progbufsize=16
Info : Examined RISC-V core; found 1 harts
Info : hart 0: XLEN=32, misa=0x40101104
Info : Listening on port 3333 for gdb connections
Info : Hart 0 unexpectedly reset
Info : Hart 0 unexpectedly reset
Info : Hart 0 unexpectedly reset
Error: esp_usb_jtag: usb sent only 0 out of 17 bytes.
Error: missing data from bitq interface
Error: dmi_scan failed jtag scan
Error: failed read at 0x11, status=2
Error: esp_usb_jtag: usb sent only 0 out of 34 bytes.
Error: missing data from bitq interface
Error: dmi_scan failed jtag scan
Error: failed read at 0x11, status=2
...

Some help?

Best regards,
Stefano

Hi Stefano,

What program do you have running on the ESP32-C3 when this issue occurs? Does this program re-configure any GPIOs? Similar errors may occur if the program configures one of the JTAG pins for a different purpose.

I suggest flashing some example like get-started/hello_world to the chip to see if this changes anything.

If the problem still occurs, could you please open an issue at https://github.com/espressif/openocd-esp32/issues, supplying the following:
* OpenOCD output at debug level (by adding -d3 argument to OpenOCD command line, see https://docs.espressif.com/projects/esp ... penocd-gdb)
* Serial output (sent via UART, if you are using the default sdkconfig, or via USB-CDC if you have enabled CONFIG_ESP_CONSOLE_USB_SERIAL_JTAG)

Stefano

I humbly suggest you read this post https://www.esp32.com/viewtopic.php?f=40&t=21809.

It's not just for Eclipse. At a minimum I'd suggest you download/make the June OpenOCD binary.

ESP_igrr wrote: ↑

Thu Jul 08, 2021 8:33 pm

What program do you have running on the ESP32-C3 when this issue occurs? Does this program re-configure any GPIOs? Similar errors may occur if the program configures one of the JTAG pins for a different purpose.

I running the hello_world example...

BrianP wrote: ↑

Fri Jul 09, 2021 2:47 am

Stefano

I humbly suggest you read this post https://www.esp32.com/viewtopic.php?f=40&t=21809.

It's not just for Eclipse. At a minimum I'd suggest you download/make the June OpenOCD binary.

Thanks. Following these post the question is to use master branch instead current release.

Thanks for your help.

Best regards,
Stefano

Let me know how it goes. As that post suggests there are a lot of interlocking bugs, documentation issues, etc., with ESP-IDF and ESP32-C3. I can reliably get JTAG to work now.