Wangjialin 9c7cc86793 1. modify i2c_set_pin function

2. update example comments and other minor changes
3. rename API:  i2c_cmd_link_create/i2c_cmd_link_delete (+4 squashed commits)

Squashed commits:
[2e0ac3e] 1. coding style: add one space after condition key words.
2. modify i2c.h, use gpio_num_t instead of int, improve comments of return values
3. add i2c index in index.rst
4. add readme for i2c example
[4991d92] update i2c.doc
[88b672e] driver: i2c

1. add mux and spin lock to run in a thread-safe way.
2. modify example code
[4eb15fe] driver: i2c code

1. add i2c master code
2. add i2c slave code
3. add i2c example code
4. add DRAM_ATTR for I2C array

2017-01-03 00:57:19 +08:00

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I2C Example

This example will show you how to use I2C module by running two tasks on i2c bus:
- read external i2c sensor, here we use a BH1750 light sensor(GY-30 module) for instance.
- Use one I2C port(master mode) to read or write the other I2C port(slave mode) on one ESP32 chip.
Pin assignment:
- slave :
  - GPIO25 is assigned as the data signal of i2c slave port
  - GPIO26 is assigned as the clock signal of i2c slave port
- master:
  - GPIO18 is assigned as the data signal of i2c master port
  - GPIO19 is assigned as the clock signal of i2c master port
Connection:
- connect GPIO18 with GPIO25
- connect GPIO19 with GPIO26
- connect sda/scl of sensor with GPIO18/GPIO19
- no need to add external pull-up resistors, driver will enable internal pull-up resistors.
Test items:
- read the sensor data, if connected.
- i2c master(ESP32) will write data to i2c slave(ESP32).
- i2c master(ESP32) will read data from i2c slave(ESP32).

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I2C Example

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