diff options
| -rw-r--r-- | decoders/i2c/__init__.py | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/decoders/i2c/__init__.py b/decoders/i2c/__init__.py index 3c29aa1..5216e01 100644 --- a/decoders/i2c/__init__.py +++ b/decoders/i2c/__init__.py @@ -59,21 +59,24 @@ http://en.wikipedia.org/wiki/I2C Protocol output format: I2C packet: -[<i2c_command>, <data>, <ack_bit>] +[<cmd>, <data>] -<i2c_command> is one of: +<cmd> is one of: - 'START' (START condition) - - 'START REPEAT' (Repeated START) - - 'ADDRESS READ' (Address, read) - - 'ADDRESS WRITE' (Address, write) + - 'START REPEAT' (Repeated START condition) + - 'ADDRESS READ' (Slave address, read) + - 'ADDRESS WRITE' (Slave address, write) - 'DATA READ' (Data, read) - 'DATA WRITE' (Data, write) - 'STOP' (STOP condition) + - 'ACK' (ACK bit) + - 'NACK' (NACK bit) <data> is the data or address byte associated with the 'ADDRESS*' and 'DATA*' -command. For 'START', 'START REPEAT' and 'STOP', this is None. +command. Slave addresses do not include bit 0 (the READ/WRITE indication bit). +For example, a slave address field could be 0x51 (instead of 0xa2). +For 'START', 'START REPEAT', 'STOP', 'ACK', and 'NACK' <data> is None. -<ack_bit> is either 'ACK' or 'NACK', but may also be None. ''' from .i2c import * |