I2C Bus Scanner¶
The word i2c.detect from file i2c-detect.frt provides
a nicely formatted overview of all connected I2C devices.
(ATmega1280)> i2c.init.default
ok
(ATmega1280)> i2c.detect
0 1 2 3 4 5 6 7 8 9 A B C D E F
0: -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- 27 -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: 50 51 -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
ok
(ATmega1280)>
In this example, two devices are connected: a port expander (PCF 8574) and two EEPROMs (a 24c64 and a ST 4128 BWP).
The missing addresses are excluded since they are not valid I2C 7-bit device addresses. They are not probed as well.
A similar command exists on Linux platforms.
See also