ESP32 Forum

I have a development system running with a ESP32-DevKitC-32U core. It has a JTAG interface on the PCB connected to the ESP32-PROG programmer. It has worked flawlessly for 6 months (Visual Studio; running Visual Micro Arduino extension).

I recently purchased an ESP32-DevKitC-32E core. It fails to connect to the JTAG interface (It does work via the USB interface). The pinout is the same. I get the following error:

----

Uploading 'TitanRev05' to 'ESP32 Dev Module' using 'ESP32 PROG'
Open On-Chip Debugger v0.10.0-esp32-20190313 (2019-03-13-09:57)
Licensed under GNU GPL v2
For bug reports, read
http://openocd.org/doc/doxygen/bugs.html
debug_level: 0
adapter speed: 2000 kHz
esp32 interrupt mask on
****[vMicro]**** Uploading App :Error: cpu0: xtensa_write_memory (line 802): DSR (FFFFFFFF) indicates target still busy!
Error: cpu0: xtensa_write_memory (line 802): DSR (FFFFFFFF) indicates DIR instruction generated an exception!
Error during upload using programmer
The uploader process failed

The uploader process failed
The uploader returned an error
Error: cpu0: xtensa_write_memory (line 802): DSR (FFFFFFFF) indicates DIR instruction generated an overrun!
Error: xtensa_write_uint32_list: error writing to 3ff48000
in procedure 'program'
embedded:startup.tcl:480: Error: ** Unable to reset target **
in procedure 'program'
in procedure 'program_error' called at file "embedded:startup.tcl", line 505
at file "embedded:startup.tcl", line 480

---

Any suggestions would be appreciated, Thanks, David

Are you sure there's no program in flash that reconfigures the JTAG GPIO pins?

This is a brand new module from Mouser Electronics. I will try again with a different module. I will program via Arduino with a running example program, which will set all the pin designations and attempt the JTAG interface.

Thanks, David

I am now using a ESP32-DevKitC-32EU, as the E device is not longer available. Same error as the E device.

I would like to resolve this, as I have a new project to start soon.

--
The 32U device works just fine. I have two ESP-PROG; same results for both.

Error:

Open On-Chip Debugger v0.10.0-esp32-20190313 (2019-03-13-09:57)
Licensed under GNU GPL v2
For bug reports, read
http://openocd.org/doc/doxygen/bugs.html
debug_level: 0
adapter speed: 2000 kHz
esp32 interrupt mask on
****[vMicro]**** Uploading App :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
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
Error during upload using programmer
The uploader process failed

The uploader process failed
The uploader returned an error

Any suggestions appreciated. Thanks, David

It's impossible to tell from here, sorry... if your ESP32 program for sure doesn't reconfigure the JTAG pins, this is a hardware error somewhere.

I have a complete controller that the ESP32 mounts to, with a JTAG interface.

Install a ESP32 U device (ESP32-DevKitC-32U); program and debug in Visual Studio/Visual Micro. Works perfectly.

Install a ESP32 UE device (ESP32-DevKitC-32UE); program and debug in Visual Studio/Visual Micro. Fails with the above mentioned error message.

Unless the logic or pinouts have changed for UE vs U, I have no explanation.

David