Shulou(Shulou.com)06/02 Report--

This article is to share with you about Linux ARM IIC I2C EEPROM read and write operation, the editor thinks it is very practical, so I share it with you to learn, I hope you can get something after reading this article, say no more, follow the editor to have a look.

There are several sets of i2C buses for detection

Root@beaglebone:~# i2cdetect-li2c-0 i2C OMAP I2C adapter I2C adapteri2c-1 i2C OMAP I2C adapter I2C adapterroot@beaglebone:~#

Check the online status of devices on each bus:-y means yes,0 means / dev/i2c-0

Root@beaglebone:~# i2cdetect-y-r 00 1 2 3 4 5 6 7 8 9 a b cde f00:-10: -20:-- UU-30:-40:-- -50: UU-60:- -- 70:-root@beaglebone:~# UU indicates that there is a device in use at the address 0x50.

Look at the contents of EEPROM. The following 0 indicates / dev/i2c-0 bus, and 0x50 is the address of EEPROM.

Root@beaglebone:~# i2cdump-f-y 0 0x50No size specified (using byte-data access) 0123456789abcdef 0123456789abcdef00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff .10: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff .20: ff ff ff ff ff Ff ff ff ff ff ff ff ff ff ff ff .30: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff .40: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff .50: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff .60: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff .70: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff .80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff. .90: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff .a0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff .b0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff .c0: ff ff ff ff ff Ff ff ff ff ff ff ff ff ff ff ff .d0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff .e0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff .f0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff .root @ beaglebone:~#

Get / set the 01st byte of the 0x24 device on the i2C0-0 bus

After root@beaglebone:~# i2cget-f-y 0 0x24 01 root@beaglebone:~# i2cset-f-y 0 0x24 01 0xaa # was powered off, the data written was invalid, pending investigation. Root@beaglebone:~# i2cget-f-y 0 0x24 01

BeagleBone Black reads from the file and writes to the EEPROM, which is permanent.

It takes more than 5 minutes for root@beaglebone:~# dd if=eeprom.bin of=/sys/bus/i2c/devices/0-0050/eeprom # to read and write Linux ARM IIC I2C EEPROM. The editor believes that there are some knowledge points that we may see or use in our daily work. I hope you can learn more from this article. For more details, please follow the industry information channel.

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.