i2c-tools，i2cdump和i2cset等的使用总结



1)察看I2C总线的bus和设备地址/sys/bus/i2c/devices

root@zc706-zynq7:/sys/bus/i2c/devices# ls
0-0074  2-0039  3-0055  3-0057  5-0051  i2c-0  i2c-2  i2c-4  i2c-6  i2c-8
1-005d  3-0054  3-0056  4-0021  8-0065  i2c-1  i2c-3  i2c-5  i2c-7

2）用i2cdump察看设备的内容
i2cdump -f -y 0 0x74
i2cdump -f -y 8 0x65

3）找出EEPROM的设备
i2c@2 {
     #address-cells = <0x1>;
     #size-cells = <0x0>;
     reg = <0x2>;

     eeprom@54 {
      compatible = "at,24c08";
      reg = <0x54>;
     };
    };

3-0054是AT24C08，EEPROM

4）用i2cset设置EEPROM的内容
i2cset -f -y 3 0x54 1 0x55   //mem addr 1
i2cset -f -y 3 0x54 2 0x55   //mem addr  2
i2cset -f -y 3 0x54 3 0x55   //mem addr 3
然后用i2cdump -f -y 3 0x54  察看EEPROM的内容，看到0x55已经烧写到EEPROM里了。