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1The I2C protocol knows about two kinds of device addresses: normal 7 bit 1The I2C protocol knows about two kinds of device addresses: normal 7 bit
2addresses, and an extended set of 10 bit addresses. The sets of addresses 2addresses, and an extended set of 10 bit addresses. The sets of addresses
3do not intersect: the 7 bit address 0x10 is not the same as the 10 bit 3do not intersect: the 7 bit address 0x10 is not the same as the 10 bit
4address 0x10 (though a single device could respond to both of them). You 4address 0x10 (though a single device could respond to both of them). You
5select a 10 bit address by adding an extra byte after the address 5select a 10 bit address by adding an extra byte after the address
6byte: 6byte:
7 S Addr7 Rd/Wr .... 7 S Addr7 Rd/Wr ....
8becomes 8becomes
9 S 11110 Addr10 Rd/Wr 9 S 11110 Addr10 Rd/Wr
10S is the start bit, Rd/Wr the read/write bit, and if you count the number 10S is the start bit, Rd/Wr the read/write bit, and if you count the number
11of bits, you will see the there are 8 after the S bit for 7 bit addresses, 11of bits, you will see the there are 8 after the S bit for 7 bit addresses,
12and 16 after the S bit for 10 bit addresses. 12and 16 after the S bit for 10 bit addresses.
13 13
14WARNING! The current 10 bit address support is EXPERIMENTAL. There are 14WARNING! The current 10 bit address support is EXPERIMENTAL. There are
15several places in the code that will cause SEVERE PROBLEMS with 10 bit 15several places in the code that will cause SEVERE PROBLEMS with 10 bit
16addresses, even though there is some basic handling and hooks. Also, 16addresses, even though there is some basic handling and hooks. Also,
17almost no supported adapter handles the 10 bit addresses correctly. 17almost no supported adapter handles the 10 bit addresses correctly.