JTAG Interface; fails on ESP32-DevKitC-32E (works on 32U)

[epsiloncomp]

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

[ESP_Sprite]

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

[epsiloncomp]

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

[epsiloncomp]

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

[ESP_Sprite]

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.

[epsiloncomp]

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