I2C

[English]

1 功能概述

通过I2C接口完成对EEPROM芯片的数据读写。

2 代码路径

demo路径：components\bk_cli\cli_i2c.c

3 cli命令简介

demo运行依赖的宏配置：

NAME	Description	File	value
CONFIG_I2C	support i2c	middleware\soc\bk7236\bk7236.defconfig	y

demo支持的命令如下表：

Command	Param	Description
i2c_driver init	none	init I2C driver control memory
i2c_driver deinit	none	free all resource related to I2C
i2c {id} init	i2c id number	power up and start the I2C id
i2c {id} deinit	i2c id number	power down and Stop the I2C id
i2c {id} memory_write {data_size} {dev_addr}	id: i2c id number	write data_size bytes of data to the slave device with address dev_id
	data_size:size of data written
	dev_addr: slave device address
i2c {id} memory_read {data_size}	id: i2c id	read data_size bytes of data from slave device
	data_size:size of data read

4 演示介绍

demo执行的步骤如下：

1、准备好EEPROM的模块，型号为FM24C04B，连接方式如下：

SCL----GPIO0
SDA----GPIO1
Vcc----3.3V

2、顺序发送以下命令

i2c_driver init

i2c 1 init

i2c 1 memory_write 8 50   //向EEPROM中写入8字节数据

i2c 1 memory_read 8       //从EEPROM中读取8字节数据

备注

注意：memory_write命令中的dev_addr 50为16进制，因为i2c驱动中会将dev_addr左移一位，所以传入的dev_addr需要将FM24C04B的dev_addr（1010b）右移一位。