Questions:I2C arbitration under special cases

Not Sure. But a low always wins since you can not force a logic high.

schrieb

The intention of a repeated start condition is to allow a master to keep talking on the bus without the risk of someon else getting control over the bus between two messages. If one master is talking (whether or not it has previously won an arbitration phase) no other master devices are allowed to send anything on the bus until the bus is free again i.e. a stop was sent. In other words masters have to detect a busy bus and are not allowed to send data at any time regardles of bus activity. A typical application is a "Read-After-Restart" applied on a EEPROM where a master first writes an address and then uses a repeated start condition to read back the requested data. In this case it would be fatal if an arbitration was allowed during this second addressing phase and the atomic communication would be interrupted by another master requesting a different data chunk from the same EEPROM.

Thus, to answer your question, there shouldn't be a stray stop condition coming from another device.

/Roland

I see.Thanks Roland Zitzke =E5=86=99=E9=81=93=EF=BC=9A

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