OTA

During the past weeks i’ve worked on getting the FOTA upgrades work on the 2MB boards by Olimex.

The wonderful esp-link project by Thorsten von Eicken was a great example of  two things:

1. How to concatenate the espfs filesystem image with the firmware images.
2. How to properly write a new image to the flash.

It was a nice example to start with.

So after a lot of fiddling with  Makefiles, cgi routines and esptool  – i’ve finally got the OTA working.

Which goes where – when using a bootloader for FOTA.

The files:

• master_device_key.bin –  Obtained from Espressif Cloud
• esp_init_data_default.bin – Stores default RF parameter values
• boot.bin – bootloader
• user1.bin and user2.bin – user firmware
• blank.bin – blank settings , flash to get default parameters

1. 512KB

• master_device_key.bin 0x3E000
• esp_init_data_default.bin 0x7C000
• blank.bin 0x7E000
• boot.bin 0x00000
• user1.bin 0x01000
• user2.bin 0x41000

2. 1024KB Flash

• master_device_key.bin 0x3E000
• esp_init_data_default.bin 0xFC000
• blank.bin 0xFE000
• boot.bin 0x00000
• user1.bin 0x01000
• user2.bin 0x81000

3. 2048KB Flash

• master_device_key.bin 0x3E000
• esp_init_data_default.bin 0x1FC000
• blank.bin 0x1FE000
• boot.bin 0x00000
• user1.bin 0x01000
• user2.bin 0x81000

4. 4096KB Flash

• master_device_key.bin 0x3E000
• esp_init_data_default.bin 0x3FC000
• blank.bin 0x3FE000
• boot.bin 0x00000
• user1.bin 0x01000
• user2.bin 0x81000