On Wed, Nov 26, 2014 at 03:25:29PM +0300, Alexander Kochetkov wrote: > > 22 нояб. 2014 г., в 21:12, Wolfram Sang <wsa@xxxxxxxxxxxxx> написал(а): > > > IMO a repeated start is to ensure that two messages arrive at the slave > > without interruption from another master. I can't think why a slave > > should know which type of start that was. In fact, if it does that would > > raise an eyebrow for me. Do you have an example? > > It is used to implement Device ID reading. Yes and no, I'd say :) Technically, it needs repeated start. But really, the hardware should handle this (and I know one IP core which has support for it). One could try to simulate the behaviour in the bus driver IF a second slave address AND detection of repeated start is available, but I doubt this combination exists. Still, all the _slave driver_ needs to handle is an I2C_SLAVE_EVENT_DEVICE_ID which should return the apropriate value. That being said, I have never seen querying Device ID in action. > Not sure, that the feature is really needed for the first release. I am sure it is not :D Thanks, Wolfram
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