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Diffstat (limited to 'Documentation/i2c/i2c-protocol.rst')
| -rw-r--r-- | Documentation/i2c/i2c-protocol.rst | 11 |
1 files changed, 4 insertions, 7 deletions
diff --git a/Documentation/i2c/i2c-protocol.rst b/Documentation/i2c/i2c-protocol.rst index b2092f8f815d..df0febfe6410 100644 --- a/Documentation/i2c/i2c-protocol.rst +++ b/Documentation/i2c/i2c-protocol.rst @@ -2,7 +2,8 @@ The I2C Protocol ================ -This document describes the I2C protocol. Or will, when it is finished :-) +This document is an overview of the basic I2C transactions and the kernel +APIs to perform them. Key to symbols ============== @@ -12,13 +13,9 @@ S Start condition P Stop condition Rd/Wr (1 bit) Read/Write bit. Rd equals 1, Wr equals 0. A, NA (1 bit) Acknowledge (ACK) and Not Acknowledge (NACK) bit -Addr (7 bits) I2C 7 bit address. Note that this can be expanded as usual to +Addr (7 bits) I2C 7 bit address. Note that this can be expanded to get a 10 bit I2C address. -Comm (8 bits) Command byte, a data byte which often selects a register on - the device. -Data (8 bits) A plain data byte. Sometimes, I write DataLow, DataHigh - for 16 bit data. -Count (8 bits) A data byte containing the length of a block operation. +Data (8 bits) A plain data byte. [..] Data sent by I2C device, as opposed to data sent by the host adapter. |