ESP8266 using different flash sizes – FOTA and Download tool

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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

 

How to use 1MB and above flash on espressif forum describes the use of download tool.

Here is what download tool does:

Options

  • Crystal Frequncy choices:  40Mhz, 26Mhz,  24Mhz – For a 40M crystal , the booting uart tx baud is 115200,(74880 for 26m accordinglyCrystal Freq will be set to the BYTE[48] of esp_init_data_default.bin
  • SPI Flash speed: 0 = 40MHz , 1 = 26.7MHz,  2 = 20MHz,  f = 80MHz  stored in BYTE[3]&0f of the images
  • SPI flash read mode: 0 = QIO, 1 = QOUT, 2=DIO, 3=DOUT  set to the 3rd BYTE at flash address 0x0 so it is BYTE[2].
  • Flash size: Flash size is SET to the higher 4bit of 4TH BYTE at flash address 0x0 which is BYTE[3]>>4)&0xf in the image:
    0:512KB(256KB+256KB)  – 4Mbit
    1:256KB – 2Mbit
    2:1MB(512KB+512KB) – 8Mbit
    3:2MB(512KB+512KB) – 16Mbit
    4:4MB(512KB+512KB) – 32Mbit
    5:2MB-C1(1024KB+1024KB) – 16Mbit
    6:4MB-C1(1024KB+1024KB) – 32Mbit

tout as vdd33 – esp_init_data_default.bin BYTE[107]  = 0xff

tout as adc – esp_init_data_default.bin BYTE[107]  = VDD*10 /vdd > 1.8 and vdd < 3.6/

Low power options are left out for now.

To be continued …