You might also toggle a separate pin dedicated to drive an LED each time a
TX (or RX) is completed (if you have available time in the rest of the ap.)
No extra hardware, low risk.

c

Seems like a nice simple approach...thanks :-)


-marc
On 23/7/03 21:29, "Ken Pergola" <no_spam@LOCALNET.COM> wrote:

> Hi Marc,
>
> You could use something like 74xx04 glue logic inverters if you are
worried
> about loading the bus.
> Connect LED (with series resistor) from Vcc to output of logic inverter.
Be
> mindful and don't violate the sink current spec of the device.
>
> If you want to choose how the LED lights up (logic low on inverter's input
> or logic high on inverter's input) you can connect two inverters in series
> and choose where you want to connect the LED -- on the output of the first
> inverter or on the output of the second inverter.
>
>
> I'd like to be able to add some activity LEDs to some SPI bus stuff I've
got
> going on a breadboard. I'm sure someone here has a good idea how to do
this,
> or a schematic, or horror stories...hence asking before I start :-)
>
> Any clues?

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