ESP32 Forum

Posted: **Fri Jan 22, 2021 9:01 pm**

Please help, I'm tying to run ESP-IDF example of REST server with semihost file upload through JTAG, but can't make it work.

https://github.com/espressif/esp-idf/tr ... ful_server

In my project I'm using ESP32-WROOM-32, FT2232HL JTAG, Eclipse IDE running under Windows 10. SD variant of that example works fine, but when I set semihost through menuconfig "C:\esp32_semihost" and run OpenOCD like this:

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openocd -c "set ESP_SEMIHOST_BASEDIR C:\\esp32_semihost" -f board/esp32-wrover-kit-3.3v.cfg

It goes through all initialization without errors, but file upload from PC to ESP32 web server just doesn't work...

Eclipse output during file request:

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E (138679) esp-rest: Failed to open file : /www/index.html
W (138679) httpd_txrx: httpd_resp_send_err: 500 Internal Server Error - Failed to read existing file
W (138689) httpd_uri: httpd_uri: uri handler execution failed

OpenOCD output (if I run OCD before resetting/flashing ESP32):

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Info : Target halted. CPU0: PC=0x400DEF54 (active)
Info : Target halted. CPU1: PC=0x401557EE

OpenOCD output (if I run OCD after resetting/flashing ESP32):

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Info : Target halted. CPU0: PC=0x400DEF54 (active)
Info : Target halted. CPU1: PC=0x401557EE
Error: File name length if greater then the maximum possible value!

UPD1:
Also tried running openocd inside eclipse using this guide: https://medium.com/@kondal.kolipaka/gdb ... 7a6661f32f but with only these config options in Debugger tab, output still same:

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-c "set ESP_SEMIHOST_BASEDIR C:\\semihost"
-f board/esp32-wrover-kit-3.3v.cfg

Couldn't find any useful information about semihosting except one paragraph in espressif docs about how to run it and few mentions here and there that it's a thing and you can use it with JTAG, any example from scratch how to configure and use it for retrieving files from PC...

UPD2:
Looks like this guy had same issue: viewtopic.php?p=61230#p61230 still no solution to make it work...

Posted: **Sat Jan 23, 2021 2:00 pm**

Looks like I found the solution of my problem. I was confused by "Host path to mount (e.g. absolute path to web dist directory) " option in project menuconfig, specifically "absolute path to web dist directory". If you run openocd with absolute path in ESP_SEMIHOST_BASEDIR argument, you need to leave "Host path to mount" value empty or just set second argument in esp_vfs_semihost_register function NULL.

Posted: **Thu Jul 28, 2022 7:45 am**

I have the same problem，Can you tell me how to set the host path?

Posted: **Thu Aug 25, 2022 4:34 pm**

I don't have time to test this today, but here are some things to verify.

1) Build your web application. IIRC it is in ./front/web-demo. You'll need nodejs installed and run "npm install" and then "npm build run" from the directory. VSCode is good for this.
2) In your config file, set your directory to /front/web-demo/dist

I use VisualGDB for ESP32 development. It's worth the $100 or whatever it costs. The custom edition allows for side-by-side framework installs for other hardware as well.

ESP32 Forum

ESP-IDF semihost example doesn't work under Windows.

ESP-IDF semihost example doesn't work under Windows.

Re: ESP-IDF semihost example doesn't work under Windows.

Re: ESP-IDF semihost example doesn't work under Windows.

Re: ESP-IDF semihost example doesn't work under Windows.