Need help using ESP32 flash download tool

Posts: 62
Joined: Mon Feb 01, 2021 9:41 am

Need help using ESP32 flash download tool

Postby zazas321 » Tue Sep 14, 2021 5:06 am

Hello. I am looking for the most simple method or tool for the customer to flash the ESP32 devices. Ideally, he would need to run a script or some sort of tool that will do everything for him so that it is as simple as possible, he would only need to provide the binary file.
I am now looking into ESP32 flash download tool but I am not fully understanding how to use it. In my project, I am using a custom partition table:

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nvs,      data, nvs,     0x9000,  0x4000,
otadata,  data, ota,     0xd000,  0x2000,
phy_init, data, phy,     0xf000,  0x1000,
factory,  app,  factory, 0x10000,  0x0F0000,
ota_0,    app,  ota_0,           , 0x0F0000
ota_1,    app,  ota_1,           , 0x0F0000,
storage,  data, spiffs,          , 0x4000,
I use OTA and SPIFFS. Could someone please give me a hand and explain to me how do I program a device using a flash download tool?

Posts: 1639
Joined: Wed Jun 14, 2017 9:00 pm

Re: Need help using ESP32 flash download tool

Postby chegewara » Tue Sep 14, 2021 7:13 am

It all depends how you build binaries. When you are working with esp-idf and build with " build" then after success build you can see output similar to this (its from linux):

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/home/chegewara/.espressif/python_env/idf4.4_py3.8_env/bin/python ../../../components/esptool_py/esptool/ -p (PORT) -b 460800 --before default_reset --after hard_reset --chip esp32c3 --no-stub write_flash --flash_mode dio --flash_size detect --flash_freq 80m 0x0 build/bootloader/bootloader.bin 0x8000 build/partition_table/partition-table.bin 0x10000 build/hello-world.bin
1) from this output you can learn what binary flash at what offset using espressif flash download tool (windows): ... ther-tools
1a) or you can learn offsets from partition table, simple math,

2) You can also write script for client that will use esptool (any OS):

3) esp32 S2 can be easy flashed from some special website and DFU binary generated with dfu (any OS and chrome browser)

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