Category:ESP8266 Program

Enter Into Flash Mode

• Most development board has auto enter into flash mode circuits, more commerial products do not really need this.
• Pull GPIO 0 of ESP8266 before power up or reboot to enter into flash mode. -> So simply hold down GPIO 0 and press once reset will enter into flash mode manully.
• Connect 3.3V/GND/TXD=>RXD/RXD->TXD to target, recommand USB-TTL downloader here

• 

  NWI1072 ESP Relay board, enter into flash mode.

• 

  For our ESP8266 Adapter Board

• 

  See a GIF here, if you successfully enter into flash mode.

• 

  debug info shows enter into flash mode

Programming

• Use Arduino-ESP8266 to compile and download
• Use ESP Download Tool (windows) to download firmware bin only
• Use ESPTool (linux) to download firmware bin only

Details For Firmware

Updated:

Type	Address	Description
boot_v1.X.bin	0x00000	from the official SDK
esp_init_data_default.bin	0x3FC000	from the official SDK
blank.bin	0x3FE000	from the official SDK
user1.bin	0x01000	user application 1

Boot Process

• Reset vector is 0x40000080.
• Boots into Espressif code in IROM0.
• Loads SPI ROM data.
• Starts executing ESP SDK-code shadowed SPI ROM (unconfirmed).

SPI Flash ROM Layout

Address	Size	Name	Description
00000h	248k	app.v6.flash.bin	User application
3E000h	8k	master_device_key.bin	OTA device key
40000h	240K	app.v6.irom0text.bin	SDK libraries
7C000h	8k	esp_init_data_default.bin	Default configuration
7E000h	8k	blank.bin	Filled with FFh. May be WiFi configuration.

Dump and mass deply

• After finish coding, upload your code lua into target board, better be complied
• dump out the flash content out and save as firmware.bin file for batch deploy
• use this firmware.bin for new products

1. So first setup the esptool.py working environment
2. read out the flash content by command

./esptool.py --baud 115200 --port /dev/ttyUSB0 read_flash 0 4194304 output.bin

1. 4194304 mbits = 4MB, read flash time take at least more than 5 minutes
2. 2097152 mb = 2MB, 1048576 mbits = 1MB, 524288 = 512 KB, 262144 = 256 KB
3. use flash download tool flash normally

• Also can try dump mem out, like RAM, etc, dumping the ROM (64 KiB) from the chip:

./esptool.py dump_mem 0x40000000 65536 iram0.bin

Details For Boards

Flash Mode for ESP Relay Board Series

Product	Manully Enter Into Flash Mode	Note
ESP Relay Board SPST	The board has not reset pin lead out please hold down BTN2, and then power up	No need to connect AC mains power, supply 5V only
ESP Relay Board DPST	Hold down BTN, and press RST once	-
ESP Relay Board VDC	Hold down BTN, and press RST once	No need to connect AC mains power, supply 5V only
ESP Relay Board IL	Hold down BTN, and press RST once	-
ESP LEDs	Hold down IO0, and press RST once	-

Other Modules

Models	Setup	Flash Read
ESP-01M	ESP8285 / 1MB / 1500 000 speed / DOUT (fixed) / Crystal 26Mhz / SPI 40Mhz	flash vendor:51h : N/A flash devID: 4014h QUAD;8Mbit crystal: 26 Mhz
ESP-12S / ESP-12F	ESP8266 / 4MB / 1500 000 speed / DIO / Crystal 26Mhz / SPI 40Mhz	-

Programming Details for ESP Relay Board

• Our default firmware bin file can be found on this page, including arduino or nodemcu firmware.
• Serial port output debug information by our default firmwarem baudrate 115200.
• Get esp download tool from ESP_Download_Tool, flash .bin firmware file to board 0x00000, more instruction please see the page.

Debug

• Open arduino IDE, and set baud rate to 74880 on serial, can find esp8266 debug info.

ets Jan  8 2013,rst cause:1, boot mode:(3,6)

load 0x4010f000, len 1384, room 16 
tail 8
chksum 0xef
csum 0xef
csum err
ets_main.c 

• reset causes:

   0: 
   1: normal boot
   2: reset pin
   3: software reset
   4: watchdog reset

• boot device:

   0:
   1: ram
   3: flash

Flash Example

• 

  Flash example for ESP-12S, AT BIN 1.7. Use 16Mbit-C1

Flash Error Log

• flash size is not correctly selected, in this case should be 16Mbit-C1 instead of 32Mbit

mismatch map 5,spi_size_map 4
system_partition_table_regist fail

Incorrect flash mode

ets Jan  8 2013,rst cause:1, boot mode:(3,7)

load 0x4010f000, len 1384, room 16 
tail 8
chksum 0xef
csum 0xef
csum err
ets_main.c

• Fix:esptool.py write_flash 0x0 Yxxxx.bin
• change to below, add dout SPI flash mode

esptool.py write_flash --flash_mode dout 0x0 Yxxxx.bin

Documents

backup

• Please see a clear demo video here.