On Thu, Jan 24, 2013 at 07:18:47PM +0800, Mark Brown wrote: > On Thu, Jan 24, 2013 at 12:13:29PM +0100, Wolfram Sang wrote: > > On Sat, Dec 15, 2012 at 11:21:36PM +0900, Mark Brown wrote: > > > > also get things like read operations which appear as multiple > > > transactions on the I2C bus so require something higher level than what > > > multi-master provides. > > > I don't get what you mean here. Can you elaborate? > > A read is typically implemented as a write of the register address > followed by a read of the value, usually with the ability to free the > bus in between. If two devices attempt to access the register map > simultaneously this results in the address going wrong. Could happen. But in what situations will one not use repeated start here? Especially when designing a multi-master bus? -- Pengutronix e.K. | Wolfram Sang | Industrial Linux Solutions | http://www.pengutronix.de/ |
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