Need advice for ESP32S3-WROOM-1 (4MB)

Configuration: Windows 10, Visual Studio Code 1.71.2, Platform ESP32 5.0.0 and 5.2.0

Hello, I use to flash bare ESP models like ESP8266-12, ESP32-WROOM-32 and ESP32-S3-WROOM-1. Never used ready boards, which are mostly referenced in platformio.ini >> board

With ESP32-S3 I startet recently with buying some ESP32-S3-WROOM-1N4 with 4MB Flash. I startet to (try to) flash them with the following platformio.ini:

[platformio] default_envs = esp32S3

[env] framework = arduino monitor_speed = 115200 upload_speed = 921600

`[env:esp32S3] build_flags = -D CORE_DEBUG_LEVEL=0 platform = espressif32 board = esp32-s3-devkitc-1

` I then realized quickly, that the referenced board (a “naked” ESP32-WROOM-1N4 seems not to available) has 8MB of flash, not 4MB and an error message told me so… I then created an own board file esp32-s3-wr-1-4MB.json which is a changed esp32-s3-devkitc-1.json: (changed lines marked)

`{ “build”: { “arduino”:{ “ldscript”: “esp32s3_out.ld”, “partitions”: “default.csv” }, “core”: “esp32”, “extra_flags”: [ “-DARDUINO_ESP32S3_DEV”, “-DARDUINO_USB_MODE=1”, “-DARDUINO_RUNNING_CORE=1”, “-DARDUINO_EVENT_RUNNING_CORE=1” ], “f_cpu”: “240000000L”, “f_flash”: “40000000L”, <<<<<<<<<<< “flash_mode”: “dio”, “hwids”: [ [ “0X303A”, “0x1001” ] ], “mcu”: “esp32s3”, “variant”: “esp32s3” }, “connectivity”: [ “wifi” ], “debug”: { “default_tool”: “esp-builtin”, “onboard_tools”: [ “esp-builtin” ], “openocd_target”: “esp32s3.cfg” }, “frameworks”: [ “arduino”, “espidf” ], “name”: “ESP32S3 WROOM-1N4, 4MB, No PSRAM”, <<<<<<<<<<< “upload”: { “flash_size”: “4MB”, <<<<<<<<<<< “maximum_ram_size”: 327680, “maximum_size”: 4194304, <<<<<<<<<<< “require_upload_port”: true, “speed”: 460800 }, “url”: “https://docs.espressif.com/projects/esp-idf/en/latest/esp32s3/hw-reference/esp32s3/user-guide-devkitc-1.html”, “vendor”: “Espressif” }

` and placed it in a new folder “boards” in my project. After that, I received a new error message that says, that bootloader_dio_40m.bin wasn’t found. I searched and found under …<framework>\tools\sdk\esp32s3\bin all available bootloaderX.bin files. But in contrast to the esp32\bin folder, where the bootloader_dio_40m.bin is there, here in \esp32s3\bin it is not… ? I tried then to compile and flash my program with the original Arduino IDE … and it worked.This file is named there as “HelloWord.ino.bootloader.bin”. I copied this file to …<framework>\tools\sdk\esp32s3\bin as bootloader_dio_40m.bin (with bad feelings!). But it worked. I could now compile and flash my programs on a bare ESP32S3-WROOM-1N4.

But … then came platform ESP32 release 5.2.0. And from now on one more file is requested: bootloader_dio_40m.elf. As before, the 80m and 120m variants of the bootloaderX files are available under …\esp32S3\bin, but nothing for 40m.

Now I am at the end of the street amd needs some help with the following questions:

1. What is the correct way to program bare ESP-Modules. All available “boards” only address complex developer PCB.
2. Is it the right way to create own board .json files?
3. How do I generate the right way bootloaderX files (.bin AND .elf !!). Or must I wait until they are delivered with a release?
4. Why are these files available under \esp32\bin but not under \esp32S3\bin?
5. What are these requested .elf variants, that wasn’t necessary until 5.0.0?

Thank you for helping! Regards Andree

[ams-hh]

OK … 2 Minutes too late …

It was my fault! While copying back and forth I had had my old json file contents. With your provided file now it works!

THANK YOU !!!

[Jason2866]

Your platformio setup is probably borked. There is nowhere 40Mhz as flash frequency now! Delete the hidden folder .platformio to clean it. Platformio will rebuild,