Lpc2000

On Monday, July 12, 2004, at 11:52 AM, gregdeuerling wrote:

> I have a Maxim thermocouple converter (MAX6675) hooked up to a
> LPC2294's SPI.  The MAX6675 is SPI read only device, i.e., enable
> chip select and it starts shifting out bits on each SPI clock.
>
> Is there no way to make the LPC's SPI receive a byte with out
> sending a byte first ?  I hate to have to bit bang the LPC's I/O's
> to get the SPI functionality I need, but it looks like thats what
> I'm going to have to do.
>
> Am I over looking something ???
>

That's the way SPI works - a byte is received as it sent (as each bit 
is clocked out, a bit is clocked in). You write a byte to the transmit 
register, it sends/receives, then you read the transmit register to get 
the byte back.

Just send a 0 (or whatever) in order to read.

Shannon