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ESP8266 Datasheet(PDF) 75 Page - ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD.

Part # ESP8266
Description  General Purpose Input/Output Interface (GPIO)
PDF  117 Pages
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Manufacturer  ESPRESSIF [ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD.]
Direct Link  https://www.espressif.com/
Logo ESPRESSIF - ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD.

ESP8266 Datasheet(HTML) 75 Page - ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD.

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9. I2C User Guide
9.
I2C User Guide
9.1. Functional Overview
ESP8266EX now has interfaces for I2C master devices, and allows control and reading and
writing over other I2C slave devices (e.g. most digital sensors).
All GPIO pins can be configured with open-drain mode, thus easily enabling GPIO interface
for I2C data or clock functionalities.
Besides that, the chip has pull-up resistance inside which can help save the pull-up
resistance outside.
As an I2C master, ESP8266EX has its waveforms of the SDA and SCL lines simulated from
SPIO, where SDA access is behind the positive edge of SCL. SCL high and low levels will
maintain 5us and thus I2C clock pulse will be around 100KHz.
9.2. I2C master Interface
9.2.1. Initialization
i2c_master_gpio_init: GPIO hardware initialization.
Steps are as follows:
1. Select pin functionality and set as GPIO
2. Set the GPIO into open-drain mode
3. Initialize SDA and SCL as high levels
4. Disconnect GPIO and reset slave state
i2c_master_init(void): Reset slave state
9.2.2. Start I2C
i2c_master_start(void): master generates I2C start conditions.
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Espressif
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67 104
2017.05



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