ESP8266 AT FIRMWARE

This repository contains a new build of ESP8266 AT Firmware with some special features.
The repository contains all necessary tools to build the firmware, xtensa-lx106 toolchain, SDK, bootloader sources...
Bash scripts for easy building and flashing are included.
All sources are (hopefully) well documented, there should be no difficulties following the code and make same changes if needed.

There is no flash space to include both WPA Enterprise and SmartConfig into 512+512 Flash map.
Only one of them can be compiled, if needed at all-

Maximal size of the flash file for 512, no OTA firmware is 0x75000 (479232, 468KB) bytes
Maximal size of the flash file for 512+512 firmware is 0x79000 (495616, 484KB) bytes
Maximal size of the flash file for 1024+1024 firmware is 0xF0000 (983040, 960KB) bytes

Documentation for new and changed AT Commands

Main features:

• Built with the latest ESP8266 NON_OS SDK (v. 3.1)
• Can be installed on all ESP8266 supported SPI Flash sizes
• OTA update from any server, with MD5 checksum support, SSL support, version check, ...
  • Auto firmware partition select or forced update to any available partition
  • OTA Bootloader update is also supported
• Load any available firmware version, not only the latest, is supported
• Uses my own 2nd stage bootloader (full source available) for some special features
• New AT commands added
• Improved SSL/TLS support, up to 16384 bytes SSL buffer can be used enabling more SSL functionality
• Added support for loading CA certificate to RAM buffer
• Added support for loading the firmware from any location in SPI Flash, even above 2MB

Supported SPI Flash sizes:

• 1MB 512+512 map, 2 OTA partitions
• 2MB 512+512 map, up to 4 OTA partitions
• 4MB 512+512 map, up to 8 OTA partitions
• 2MB 1024+1025 map, 2 OTA partitions
• 4MB 1024+1025 map, up to 4 OTA partitions
• 512K single firmware, no OTA available.

Larger Flash sizes can also be used.

BUILDING

Bash script build.sh is provided for easy build of firmwares for all supported Flash sizes.
It builds all firmwares binaries and creates version info and MD5 checksum files needed for OTA.
To use it, change the working directory to at_lobo and run .\build.sh.

boris@UbuntuMate:/home/LoBo2_Razno/MAIX/ESP8266_AT_LoBo/at_lobo$ ./build.sh

=====================================
Building ESP8266/ESP8285 AT firmwares
=====================================

Building firmware for 1MB Flash (ESP8285, DOUT spi mode)
  File size = 432532
  esp8285_AT_1_2.bin OK
  esp8285_AT_2_2.bin OK

Building firmware for 512KB Flash, Flash map: 2 (512 no OTA)
  File size = 420388
  esp8266_AT_1_0.bin OK

Building firmware for 1MB Flash, Flash map: 2 (512+512)
  File size = 432532
  esp8266_AT_1_2.bin OK
  esp8266_AT_2_2.bin OK

Building firmware for 2MB Flash, Flash map: 3 (512+512)
  File size = 432612
  esp8266_AT_1_3.bin OK
  esp8266_AT_2_3.bin OK

Building firmware for 4MB Flash, Flash map: 4 (512+512)
  File size = 432612
  esp8266_AT_1_4.bin OK
  esp8266_AT_2_4.bin OK

Building firmware for 2MB Flash, Flash map: 5 (1024+1024)
  File size = 432612
  esp8266_AT_1_5.bin OK

Building firmware for 4MB Flash, Flash map: 6 (1024+1024)
  File size = 432612
  esp8266_AT_1_6.bin OK

=====================================
Finished.
boris@UbuntuMate:/home/LoBo2_Razno/MAIX/ESP8266_AT_LoBo/at_lobo$ 

boris@UbuntuMate:/home/LoBo2_Razno/MAIX/ESP8266_AT_LoBo/at_lobo$ ls -l ../bin/upgrade
total 4700
-rw-rw-r-- 1 boris boris 420388 tra  29 12:06 esp8266_AT_1_0.bin
-rw-rw-r-- 1 boris boris     32 tra  29 12:06 esp8266_AT_1_0.md5
-rw-rw-r-- 1 boris boris 432532 tra  29 12:06 esp8266_AT_1_2.bin
-rw-rw-r-- 1 boris boris     32 tra  29 12:06 esp8266_AT_1_2.md5
-rw-rw-r-- 1 boris boris 432612 tra  29 12:06 esp8266_AT_1_3.bin
-rw-rw-r-- 1 boris boris     32 tra  29 12:06 esp8266_AT_1_3.md5
-rw-rw-r-- 1 boris boris 432612 tra  29 12:06 esp8266_AT_1_4.bin
-rw-rw-r-- 1 boris boris     32 tra  29 12:06 esp8266_AT_1_4.md5
-rw-rw-r-- 1 boris boris 432612 tra  29 12:06 esp8266_AT_1_5.bin
-rw-rw-r-- 1 boris boris     32 tra  29 12:06 esp8266_AT_1_5.md5
-rw-rw-r-- 1 boris boris 432612 tra  29 12:06 esp8266_AT_1_6.bin
-rw-rw-r-- 1 boris boris     32 tra  29 12:06 esp8266_AT_1_6.md5
-rw-rw-r-- 1 boris boris 432532 tra  29 12:06 esp8266_AT_2_2.bin
-rw-rw-r-- 1 boris boris     32 tra  29 12:06 esp8266_AT_2_2.md5
-rw-rw-r-- 1 boris boris 432612 tra  29 12:06 esp8266_AT_2_3.bin
-rw-rw-r-- 1 boris boris     32 tra  29 12:06 esp8266_AT_2_3.md5
-rw-rw-r-- 1 boris boris 432612 tra  29 12:06 esp8266_AT_2_4.bin
-rw-rw-r-- 1 boris boris     32 tra  29 12:06 esp8266_AT_2_4.md5
-rw-rw-r-- 1 boris boris 432532 tra  29 12:06 esp8285_AT_1_2.bin
-rw-rw-r-- 1 boris boris     32 tra  29 12:06 esp8285_AT_1_2.md5
-rw-rw-r-- 1 boris boris 432532 tra  29 12:06 esp8285_AT_2_2.bin
-rw-rw-r-- 1 boris boris     32 tra  29 12:06 esp8285_AT_2_2.md5
-rw-rw-r-- 1 boris boris    574 tra  29 12:06 version.txt

The firmware files are created in bin/upgrade directory

Flashing

The initial firmware must be flashed to the ESP8266.
Bash script flash.sh is provided to make the flashing as easy as possible.
The correct flash.sh options must be specified, depending on the Flash type used:
Change the working directory to at_lobo and run flash.sh script

The default serial port used is /dev/ttyUSB0
If your board is attached to some other port, add the option -P <port>, where <port is serial port to which the bord is attached.

If your ESP8266/ESP8285 board cannot be reset by USB->UART adapter (for example MAIX M1W)
it is recommended to erese the chip first with .\flash.sh -eo,
then re-power it and execute one of the following commands with added -ne option

Flash to ESP8285, 1MB, 512+512 map, in dout mode:

.\flash.sh -t 1MB -m dout

Flash to ESP8266, 1MB, 512+512 map, in qio mode:

.\flash.sh -t 1MB

Flash to ESP8266, 2MB, 512+512 map, in qio mode:

.\flash.sh -t 2MB

Flash to ESP8266, 4MB, 512+512 map, in qio mode:

.\flash.sh -t 4MB

Flash to ESP8266, 2MB, 1024+1024 map, in qio mode:

.\flash.sh -t 2MB-c1

Flash to ESP8266, 4MB, 1024+1024 map, in qio mode:

.\flash.sh -t 4MB-c1

Flash to ESP8266, 512KB, single firmware, no OTA:

.\flash.sh -t 512KB