This Guide demonstrates how to download AT firmware and flash it into an ESP32-WROOM-32 device by taking ESP32-WROOM-32 as an example. The Guide is also applicable to other ESP32 modules.
Before you start, please make sure you have already connected your hardware. For more details, see Hardware Connection.
For different series of modules, the commands supported by AT firmware are different. Please refer to ESP-AT Firmware Differences for more details.
Download AT FirmwareïTo download AT firmware to your computer, please do as follows:
Navigate to AT Binary Lists
Find the firmware for your device
Click the link to download it
Here, we download ESP32-WROOM-32-AT-V3.2.0.0 for ESP32-WROOM-32. The list below describes the structure of this firmware and what each bin file contains. Other AT firmware has similar structure and bin files.
.
âââ at_customize.bin // secondary partition table
âââ bootloader // bootloader
â  âââ bootloader.bin
âââ customized_partitions // AT customized binaries
âââ mfg_nvs.csv // raw data of manufacturing nvs partition
â  âââ mfg_nvs.bin // manufacturing nvs partition binary
âââ download.config // configuration of downloading
âââ esp-at.bin // AT application binary
âââ esp-at.elf
âââ esp-at.map
âââ factory // A combined bin for factory downloading
â  âââ factory_XXX.bin
âââ flasher_args.json // flasher arguments
âââ ota_data_initial.bin // ota data parameters
âââ partition_table // primary partition table
â  âââ partition-table.bin
âââ sdkconfig // compilation configuration for AT firmware
The file download.config contains the configuration to flash the firmware into multiple addresses:
--flash_mode dio --flash_freq 40m --flash_size 4MB 0x1000 bootloader/bootloader.bin 0x8000 partition_table/partition-table.bin 0x10000 ota_data_initial.bin 0x20000 at_customize.bin 0x21000 customized_partitions/mfg_nvs.bin 0x100000 esp-at.bin
--flash_mode dio means the firmware is compiled with flash DIO mode.
--flash_freq 40m means the firmwareâs flash frequency is 40 MHz.
--flash_size 4MB means the firmware is using flash size 4 MB.
0x10000 ota_data_initial.bin means downloading ota_data_initial.bin into the address 0x10000.
Follow the instructions below for your operating system.
WindowsïBefore starting to flash, you need to download Flash Download Tool for Windows. You can refer to the Flash Download Tool User Guide for instructions.
Open the ESP32 Flash Download Tool.
Select chipType. (Here, we select ESP32.)
Select a workMode according to your need. (Here, we select Developer Mode.)
Select a loadMode according to your need. (Here, we select uart.)
Firmware Download Configurationsï
Flash AT firmware into your device. You can select either of the two ways below.
To download one combined factory bin (namely,
factory_XXX.binin thebuild/factorydirectory) to address 0, select âDoNotChgBinâ to use the default configuration of the factory bin.Download to One Address (click to enlarge)ï
To download multiple bins separately to different addresses, set up the configurations according to the file
download.configand do NOT select âDoNotChgBinâ.Download to Multiple Addresses (click to enlarge)ï
In case of flashing issues, please verify what the COM port number of download interface of the ESP32 board is and select it from âCOM:â dropdown list. If you do not know the port number, you can refer to Check port on Windows for details.
When you finish flashing, please Check Whether AT Works.
Linux or macOSïBefore you start to flash, you need to install esptool.py.
You can select either of the two ways below to flash AT firmware into your device.
To download the bins separately into multiple addresses, enter the following command and replace PORTNAME and download.config:
esptool.py --chip auto --port PORTNAME --baud 115200 --before default_reset --after hard_reset write_flash -z download.config
Replace PORTNAME with your port name. If you do not know it, you can refer to Check port on Linux and macOS for details.
Replace download.config with the content inside the file.
Below is the example command for ESP32-WROOM-32.
esptool.py --chip auto --port /dev/tty.usbserial-0001 --baud 115200 --before default_reset --after hard_reset write_flash -z --flash_mode dio --flash_freq 40m --flash_size 4MB 0x8000 partition_table/partition-table.bin 0x10000 ota_data_initial.bin 0x1000 bootloader/bootloader.bin 0x100000 esp-at.bin 0x20000 at_customize.bin 0x21000 customized_partitions/mfg_nvs.bin
To download the bins together to one address, enter the following command and replace PORTNAME and FILEDIRECTORY:
esptool.py --chip auto --port PORTNAME --baud 115200 --before default_reset --after hard_reset write_flash -z --flash_mode dio --flash_freq 40m --flash_size 4MB 0x0 FILEDIRECTORY
Replace PORTNAME with your port name. If you do not know it, you can refer to Check port on Linux and macOS for details.
Replace FILEDIRECTORY with the file directory you would flash to the address 0x0. It is normally factory/XXX.bin.
Below is the example command for ESP32-WROOM-32.
esptool.py --chip auto --port /dev/tty.usbserial-0001 --baud 115200 --before default_reset --after hard_reset write_flash -z --flash_mode dio --flash_freq 40m --flash_size 4MB 0x0 factory/factory_WROOM-32.bin
When you finish flashing, please Check Whether AT Works.
Check Whether AT WorksïTo check whether AT works, do as follows:
Open a serial port tool, such as SecureCRT;
Select the Port attached to âAT command/responseâ line (see Hardware Connection for details);
Set Baudrate to 115200;
Set Data Bits to 8;
Set Parity to None;
Set Stop Bits to 1;
Set Flow Type to None;
Enter the command âAT+GMRâ with a new line (CR LF).
If the response is OK as shown below, AT works.
AT+GMR AT version:3.2.0.0(s-ec2dec2 - ESP32 - Jul 28 2023 07:05:28) SDK version:v5.0.2-376-g24b9d38a24-dirty compile time(6118fc22):Jul 28 2023 09:47:28 Bin version:v3.2.0.0(WROOM-32) OK
Otherwise, you need to check your ESP32 startup log in one of the following ways:
Method 1:
Open a serial port tool, such as SecureCRT;
Select the port attached to the âDownload/Log outputâ line. For more information on this line, see Hardware Connection.
Set Baudrate to 115200;
Set Data Bits to 8;
Set Parity to None;
Set Stop Bits to 1;
Set Flow Type to None;
Press the RST key of the board directly. If it is like the log below, it means that ESP-AT firmware have been initalized correctly.
Method 2:
Open two serial port tools, such as SecureCRT;
In one serial port tool, select the port attached to the âAT command/responseâ line. In the other tool, select the port attached to the âDownload/Log outputâ line. For more information on these lines, see Hardware Connection.
Set Baudrate to 115200;
Set Data Bits to 8;
Set Parity to None;
Set Stop Bits to 1;
Set Flow Type to None;
Enter the command AT+RST with a new line (CR LF) to the âAT command/responseâ line. If the serial log from the âDownload/Output logâ line is like the log below, it means that ESP-AT firmware have been initialized correctly.
ESP32 startup log:
rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT) configsip: 0, SPIWP:0xee clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00 mode:DIO, clock div:2 load:0x3fff0030,len:5884 ho 0 tail 12 room 4 load:0x40078000,len:15844 load:0x40080400,len:3560 entry 0x40080604 I (29) boot: ESP-IDF v5.0-541-g885e501d99-dirty 2nd stage bootloader I (29) boot: compile time 08:40:13 I (29) boot: chip revision: v1.0 I (34) boot.esp32: SPI Speed : 40MHz I (38) boot.esp32: SPI Mode : DIO I (43) boot.esp32: SPI Flash Size : 4MB I (47) boot: Enabling RNG early entropy source... I (53) boot: Partition Table: I (56) boot: ## Label Usage Type ST Offset Length I (64) boot: 0 phy_init RF data 01 01 0000f000 00001000 I (71) boot: 1 otadata OTA data 01 00 00010000 00002000 I (78) boot: 2 nvs WiFi data 01 02 00012000 0000e000 I (86) boot: 3 at_customize unknown 40 00 00020000 000e0000 I (93) boot: 4 ota_0 OTA app 00 10 00100000 00180000 I (101) boot: 5 ota_1 OTA app 00 11 00280000 00180000 I (108) boot: End of partition table I (113) esp_image: segment 0: paddr=00100020 vaddr=3f400020 size=1a854h (108628) map I (161) esp_image: segment 1: paddr=0011a87c vaddr=3ff80063 size=00008h ( 8) load I (161) esp_image: segment 2: paddr=0011a88c vaddr=3ffbdb60 size=04d5ch ( 19804) load I (174) esp_image: segment 3: paddr=0011f5f0 vaddr=40080000 size=00a28h ( 2600) load I (176) esp_image: segment 4: paddr=00120020 vaddr=400d0020 size=11f5c0h (1177024) map I (609) esp_image: segment 5: paddr=0023f5e8 vaddr=40080a28 size=1e948h (125256) load I (660) esp_image: segment 6: paddr=0025df38 vaddr=400c0000 size=00064h ( 100) load I (676) boot: Loaded app from partition at offset 0x100000 I (676) boot: Disabling RNG early entropy source... no external 32k oscillator, disable it now. at param mode: 1 AT cmd port:uart1 tx:17 rx:16 cts:15 rts:14 baudrate:115200 module_name: WROOM-32 max tx power=78, ret=0 2.5.0
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