AVR-Chat

Hi guys, I must admit I have not tried this, but any suggestions would
be appreciated. 

Using the Mega16 SPI module to send data seems very easy (I have done
this) . . . Put your byte in the SPDR register and the processor takes
care of clocking this byte out to the selected slave. 

My question is, what do I do when I want to clock data out of a slave
device (non AVR IC) ? Can I clock 0x00 into the slave device and once
I have clocked the byte out with the Mega as master, read the SPDR
register and this should contain a byte clocked out by the slave ?

Thanks guys
Hein B
Auckland
New Zealand.

On Feb 12, 2006, at 2:02 PM, kernels_nz wrote:

> My question is, what do I do when I want to clock data out of a slave
> device (non AVR IC) ? Can I clock 0x00 into the slave device and once
> I have clocked the byte out with the Mega as master, read the SPDR
> register and this should contain a byte clocked out by the slave ?

Yes, but make sure whatever you shift into the slave device is not a  
command or data that the slave is going to act upon and do something  
undesired. 0x00 is usually safe.

--
David Kelly N4HHE, dkelly@HiWAAY.net
========================================================================
Whom computers would destroy, they must first drive mad.