=> R0 = pointer to an array of I²C transfer descriptors
R1 = b0-23 number of descriptors
b24-31 bus number
Reads from or writes to the specified I²C device on the specified bus.
This is a more powerful version of IIC_Control which can only address bus 0, and doesn't support repeated starts. On RISC OS 5 IIC_Control internally calls OS_IICOp.
Format of an I²C transfer descriptor
A complete operation is made from one or more transfer descriptors.
Offset Contents
0 b0-7 I²C address (bit 0 set to read, clear to write)
b8-b28 reserved for future use
b29 retry for response
b30 checksum read, fills offset 4 with the sum of read bytes
b31 continue transfer with no start or address sent
4 pointer to block for data
8 length of block
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