David VanHorn wrote:

>At 04:46 PM 11/24/2003 -0800, William Chops Westfield wrote:
>
>
>
>>On Monday, Nov 24, 2003, at 13:03 US/Pacific, zumbi wrote:
>>
>>
>>>Do you know how to read a half duplex line and know, by hardware, how
>>>to tell who is sending data, if master or slave ??
>>>
>>>
>
>
>I've used hardware in the past, to set them to different pulldown currents, so that the master out-drove the slave. (or vice-versa)
>Then the different voltage levels tell you who is talking, but you need an oscilloscope to see this.
>
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That thing is interesting, but i wanted to do it with a pic16f628 and a
memory I2C, i guess is not something easy, might you capture current
with A/D or some other parts of a PIC to try to do this ?

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