Espressif ESP32 User Guide

2. Getting Started
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SPI Speed
Set the SPI speed of the uploading. The default value is 40 MHz.
SPI Mode
Set the SPI speed of the uploading. The default value is QIO.
Flash Size
The size of your flash, We use 2Mbit flash in this example.
The flash size of 1MB, 2MB, 4MB, 8MB, 16MB and 32MB are supported.
Start Address
Set the start addresses of the bin files. The start address of blank.bin and
esp_init_data_default.bin may be different when you use a different flash size.
For the start Address of different size of flash, refer to Table 2-4.
Item
Value
Table 2-4. Configuration Items of uploading files
File Name
Start Address
Notes
Flash Size: 1 MB
Flash Size: 2 MB
boot.bin
0x00000
-
irom1.bin
0x04000
-
irom0_flash.bin
0x40000
-
user.ota
①
Doesn’t need to be uploaded.
-
blank.bin
0xFE000
0x1FE000
As shown in the figure above, the file will
start from the second section(4K) from
bottom of the flash.
②
esp_init_data_defa
ult.bin
③
0xFC000
0x1FC000
As shown in the figure above, the file will
start from the fourth section(4K) from
bottom of the flash.
②
Notes:
1.
User.ota file doesn’t need to be uploaded, and will be used in OTA upgrading.
2.
The flash size of 1MB, 2MB, 4MB, 8MB, 16MB and 32MB are supported.
3.
esp_init_data_default.bin isn’t provided in the version 1.0.0.
Espressif
2015.12
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Espressif ESP32 Specifications

General

Clock Speed	Up to 240 MHz
SRAM	520 KB
Wi-Fi	802.11 b/g/n
Bluetooth	Bluetooth v4.2 BR/EDR and BLE
GPIO Pins	34
Operating Voltage	2.2V to 3.6V
Operating Temperature	-40°C to +125°C
Processor	Tensilica Xtensa LX6
Flash Memory	4MB (varies by module)
ADC	12-bit SAR ADC up to 18 channels
DAC	2 channels of 8-bit DACs
I2C	2 x I2C
I2S	2 x I2S
Interfaces	CAN 2.0
SPI	4 SPI interfaces
UART	3 x UART