How to decipher i2cdetect matrix output?
-
I've been looking all over for good documentation for this, but I can't seem to decipher the output given by the console after running the following command:
i2cdetect -y 0
I've attached a picture of the console window output after I enter this command.
-
@Nathan-Guyette Please read this Linux man page
i2cdetect(8) - Linux man page
-
Yes thank you, but that doesn't tell me what the rows and columns are, or how to decipher them.
-
@Nathan-Guyette Each I2C device must have a unique 7 bit address from 0x00 to 0x7f hex (ie. from 0 to 127 dec).
0x00 - 0x02 (more exactly 0x00 - 0x07) and 0x78 - 0x7F are reserved I2C addresses.# Omega2+ FW v0.3.2 b223 root@Omega-5BE1:/# i2cdetect -l i2c-0 i2c 10000900.i2c I2C adapter root@Omega-5BE1:/# i2cdetect -y 0 0 1 2 3 4 5 6 7 8 9 a b c d e f 00: -- -- -- -- -- -- -- -- -- -- -- -- -- 10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 50: -- -- -- -- -- -- -- 57 -- -- -- -- -- -- -- -- 60: -- -- -- -- -- -- -- -- 68 -- -- -- -- -- -- -- 70: -- -- -- -- -- -- -- -- root@Omega-5BE1:/# i2cget -y 0 0x68 0x00 # seconds 0x30 root@Omega-5BE1:/# i2cget -y 0 0x68 0x01 # minutes 0x50 root@Omega-5BE1:/# i2cget -y 0 0x68 0x02 # hours 0x21 root@Omega-5BE1:/# i2cget -y 0 0x68 0x03 # Day of the Week 0x01 root@Omega-5BE1:/# i2cget -y 0 0x68 0x04 # Day 0x08 root@Omega-5BE1:/# i2cget -y 0 0x68 0x05 # Month and Century 0x07 root@Omega-5BE1:/# i2cget -y 0 0x68 0x06 # Year 0x19There are two (2) I2C devices on the i2c-0 bus of this Omega2:
0x57 is a AT24C32 RAM
0x68 is a DS3231 RTC
and the current date and time is (2)019-07-08 Monday 21:50:30 UTC.Please search on the web 'DS3231 AT24C32 IIC High Precision Real Time Clock Module For Arduino'
(on Omega2 the Vcc is 3.3 V)
-
Wow, thank you so much! This is exactly what I was looking for.