esp32s3 cable fails to open

[mohammed-nurulhoque]

Trying to use an esp32s3 with esp-usb-bridge firmware to program a colorlight 5a-75b fpga.

empty
fails to open esp_usb_jtag device vid:pid 0x303a:0x
JTAG init failed with: std::exception

I compiled openFPGALoader from main. Currently in this repo, it puts the PID of esp32s3 as 1001 but mine shows 1002 so I patched that.and still got the error above.

I can see the device in lsub as Bus 001 Device 125: ID 303a:1002 Espressif Systems Co. Ltd. ESP USB Bridge
And openocd is able to see the fpga through the bridge

$ openocd -f setup.cfg -c "init; svf blink.svf; exit"
Open On-Chip Debugger 0.12.0+dev-02123-g306114954 (2025-08-12-16:12)
Licensed under GNU GPL v2
For bug reports, read
	http://openocd.org/doc/doxygen/bugs.html
Info : esp_usb_jtag: VID set to 0x303a and PID to 0x1002
Info : esp_usb_jtag: capabilities descriptor set to 0x30a
Info : esp_usb_jtag: Device found. Base speed 4800KHz, div range 1 to 1
Info : clock speed 4800 kHz
Info : JTAG tap: ecp5.tap tap/device found: 0x41111043 (mfg: 0x021 (Lattice Semi.), part: 0x1111, ver: 0x4)

but is failing for me for other reasons YosysHQ/prjtrellis#252

Anyway, that shows the device is definitely connected.

[trabucayre]

Could you share links to description on howto prepare/flash esp32s3 firmware?
Maybe something differs between https://github.com/emard/esp32s3-jtag and the procedure/code you have used.
Could you try to replace 0x1001 by 0x1002 here: https://github.com/trabucayre/openFPGALoader/blob/master/src/esp_usb_jtag.cpp#L117

[mohammed-nurulhoque]

Oh I used https://github.com/espressif/esp-usb-bridge

[trabucayre]

I have tried to prepare my waveshare esp32-s3-zero, but needs a bit more time to see how to modify the project for my board (waveshare focus wiki to micropython and arduino).

[trabucayre]

I have pushed this commit.
esp32-s3 with espressif firmware is correctly seen/uses but the FPGA is not seen (it's also true with openocd).
My pinout is based on @emard firmware -> maybe something wrong with the firmware's configuration.
Could you try in your side?
Thanks

[emard]

can yo send or upload o net firmware binary so i can download it and try with my hardware

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On Mon, Aug 25, 2025 at 10:21 AM Gwenhael Goavec-Merou < ***@***.***> wrote: *trabucayre* left a comment (trabucayre/openFPGALoader#578) <#578 (comment)> I have pushed this commit <2580aed> . esp32-s3 with espressif firmware is correctly seen/uses but the FPGA is not seen (it's also true with openocd). My pinout is based on @emard <https://github.com/emard> firmware -> maybe something wrong with the firmware's configuration. Could you try in your side? Thanks — Reply to this email directly, view it on GitHub <#578 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AC4K2RYP5YJFMF7RVWGUEDD3PLBR7AVCNFSM6AAAAACDXIPXVGVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZTEMJZGI4TMNBTGA> . You are receiving this because you were mentioned.Message ID: ***@***.***>

[emard]

tricky things there is how to configure pins so that internal jtag is detached from esp32 CPU JTAG and routed outside to hardware pins of JTAG to FPGA This is sofware routing of JTAG port and would be very interesting if made to work I know your mentioned source in C but I have never tried it. I tried to make micropython version of that instead but currently micropython is not yet ready, I issued and waiting for support. Using my arduino source I succeded to hardware-route JTAG of S3 as you know. I tried the same source on C3 and it doesn't work, it compiles ok but connects to internal esp32 CPU JTAG instead of exposing external JTAG although I have set exposing C3 registers but something is missing

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On Mon, Aug 25, 2025 at 11:50 AM D EMARD ***@***.***> wrote: can yo send or upload o net firmware binary so i can download it and try with my hardware On Mon, Aug 25, 2025 at 10:21 AM Gwenhael Goavec-Merou < ***@***.***> wrote: > *trabucayre* left a comment (trabucayre/openFPGALoader#578) > <#578 (comment)> > > I have pushed this commit > <2580aed> > . > esp32-s3 with espressif firmware is correctly seen/uses but the FPGA is > not seen (it's also true with openocd). > My pinout is based on @emard <https://github.com/emard> firmware -> > maybe something wrong with the firmware's configuration. > Could you try in your side? > Thanks > > — > Reply to this email directly, view it on GitHub > <#578 (comment)>, > or unsubscribe > <https://github.com/notifications/unsubscribe-auth/AC4K2RYP5YJFMF7RVWGUEDD3PLBR7AVCNFSM6AAAAACDXIPXVGVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZTEMJZGI4TMNBTGA> > . > You are receiving this because you were mentioned.Message ID: > ***@***.***> >

[trabucayre]

@emard In fact I have retried with default config (ie pinout) and it's not working. Also tried to use UART to debug and read a bit the code:

• configuration is performed
• some usb operation are performed
• it's all.

[trabucayre]

Small update: with https://github.com/espressif/esp-usb-bridge tag v1.1.0 everything is working with openFPGALoader master branch.
Look like some refactoring have broken the code.

[emard]

Great! I'll try to compile the code maybe even locate a patch that breaks it

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On Wed, Aug 27, 2025 at 6:25 PM Gwenhael Goavec-Merou < ***@***.***> wrote: *trabucayre* left a comment (trabucayre/openFPGALoader#578) <#578 (comment)> Small update: with https://github.com/espressif/esp-usb-bridge tag v1.1.0 everything is working with openFPGALoader master branch. Look like some refactoring have broken the code. — Reply to this email directly, view it on GitHub <#578 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AC4K2R2MZC73WCXYJJWNXKD3PXLWJAVCNFSM6AAAAACDXIPXVGVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZTEMRYHEYDCNBRGU> . You are receiving this because you were mentioned.Message ID: ***@***.***>

[trabucayre]

@emard I'm not sure it's relevant to search the commit introducing this regression. People working on this repository seems to prepare a rework: maybe better to wait for next release?

[emard]

I agree, let them release new then we'll see how it works they are probably already aware for things to fix

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On Mon, Sep 22, 2025 at 10:26 AM Gwenhael Goavec-Merou < ***@***.***> wrote: *trabucayre* left a comment (trabucayre/openFPGALoader#578) <#578 (comment)> @emard <https://github.com/emard> I'm not sure it's relevant to search the commit introducing this regression. People working on this repository seems to prepare a rework: maybe better to wait for next release? — Reply to this email directly, view it on GitHub <#578 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AC4K2RYGMTG3USGRMXWMWEL3T6XBZAVCNFSM6AAAAACDXIPXVGVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZTGMJXGUZTSOBZHA> . You are receiving this because you were mentioned.Message ID: ***@***.***>