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ESP32-S3 USB-JTAG
Posted: Sun Jan 16, 2022 3:04 pm
by daniSi
Dear,
I want to use a external ESP-Prog for debugging, but the esp does not respond. Following the datasheet the setup should be correct, with setting the GPIO3 pin high over a pull-up resistor. After running openocd with:
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openocd -f interface/ftdi/esp32_devkitj_v1.cfg -f board/esp32s3-ftdi.cfg
the output is following:
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Open On-Chip Debugger v0.11.0-esp32-20211220 (2021-12-20-15:45)
Licensed under GNU GPL v2
For bug reports, read
http://openocd.org/doc/doxygen/bugs.html
adapter speed: 20000 kHz
Warn : Interface already configured, ignoring
DEPRECATED! use 'adapter speed' not 'adapter_khz'
adapter speed: 5000 kHz
Info : Listening on port 6666 for tcl connections
Info : Listening on port 4444 for telnet connections
Info : clock speed 5000 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: esp32s3.cpu0: IR capture error; saw 0x00 not 0x01
Warn : Bypassing JTAG setup events due to errors
Warn : target esp32s3.cpu0 examination failed
Warn : target esp32s3.cpu1 examination failed
Info : starting gdb server for esp32s3.cpu0 on 3333
Info : Listening on port 3333 for gdb connections
It seems if still the builtin debugger would be selected since running:
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openocd -f board/esp32s3-builtin.cfg
still works.
Additionally, I would like to know what is the disadvantage of using the builtin debugger? In openocd v0.10.0-esp32-20211111 I have received the message that its recommended to disable flash support, would this apply also to the USB-JTAG? However, this message has now disappeared in v0.11.
Re: ESP32-S3 USB-JTAG
Posted: Mon Jan 17, 2022 1:20 am
by ESP_Sprite
The JTAG controller is only connected to one port at the time (either the USB-serial-JTAG controller or the external JTAG port) and you'll need to burn an eFuse to change it over from one to the other.
I think the openocd message you got was because in the earlier version, flash support may not have been fully developed yet; the latter version most likely fixed that.
The disadvantages of USB-serial-JTAG I can think of is that in certain situations it may be a tad slower than external JTAG (but I wouldn't be surprised in daily use it's actually faster), and that it does not play nice with light sleep/deep sleep, as in, if that happens the entire USB device disappears rather than just the JTAG tap. The advantage is that you get one for free with every chip
Re: ESP32-S3 USB-JTAG
Posted: Mon Jan 17, 2022 8:46 am
by daniSi
Thank you for the practical explanation of advantages/disadvantages, it was helpful.
About the selection I have looked to the eFuses and by default they have been on 0, so actually, already by default the external JTAG should be selected, correct?
STRAP_JTAG_SEL 0b0
DIS_USB_JTAG 0b0
DIS_USB_SERIAL_JTAG 0b0 (I guess is the DIS_PAD_JTAG)
after this I have burned the STRAP_JTAG_SEL to 1, but still the result is the same, its connected to the builtin JTAG. Maybe some other idea?
Re: ESP32-S3 USB-JTAG
Posted: Mon Jan 17, 2022 8:54 am
by ESP_Sprite
See the
ESP32S3 TRM; if you enable that efuse, you should be able to use GPIO3 as a bootstrap pin to switch between the two. You probably want to hit EFUSE_DIS_USB_JTAG if you want to permanently switch to external JTAG.
Re: ESP32-S3 USB-JTAG
Posted: Mon Jan 17, 2022 11:42 am
by daniSi
This was my purpose to select over GPIO3 with a pullup, as it was also described in my first post, therefore is there something else which should be set, apart from the eFuse pins and the GPIO3? Thank you
Re: ESP32-S3 USB-JTAG
Posted: Thu Aug 18, 2022 1:19 pm
by ifoxbr
Hi DaniSi
Were you able to use esp-prog (external Jtag) with ESP32S3 ? Which USB driver did you use to connect both the internal and external Jtag? Are you using GPIO3 to select or burned eFuse?
Regards
Re: ESP32-S3 USB-JTAG
Posted: Thu Oct 06, 2022 7:31 am
by daniSi
Hi ifoxbr,
I have burned the fuses and use now the external jtag. To make it work i have burned the fuses as followed:
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espefuse.py --port COM4 burn_efuse DIS_USB_JTAG
Re: ESP32-S3 USB-JTAG
Posted: Wed Oct 19, 2022 2:08 pm
by ifoxbr
Hi DaniSi
Thanks for response
One more question, how was your configuration file "settings.json" on tags as shown below ?
"idf.openOcdConfigs": [
"board/esp32s3-builtin.cfg"
],
"idf.portWin": "COM12",
"idf.pythonBinPathWin": "C:\\Espressif\\python_env\\idf5.0_py3.8_env\\Scripts\\python.exe",
"idf.toolsPathWin": "C:\\Espressif",
"idf.flashType": "JTAG",