Content originally posted in LPCWare by frame on Fri Feb 15 08:21:07 MST 2013
Quote: kevin
The problem is that, having sent the seven address bits plus the W bit the ninth bit is logic high and then returns me an error.
Does anyone know what might be the problem.
The slave is assumed to pull SDA low during the 9.th bit, commonly referred to as "Acknowledge".
If he does not, he might not feel addressed. Either the address you send
is really incorrect (i.e. not the address of the slave), or he is in some unknown state,
because he catched some noise on the bus during startup.
I hope your bus pull-up is properly dimensioned.
