Lpc2000

Hi Chris,
  The only LPC part that does other data sizes other then 8 bits is
the LPC2138 which has a SPI and SSP unit that has data sizes from 4 to
16 bits. That was the main reason why I moved over to this part.

regards,
Charles


--- In lpc2000@yahoogroups.com, "sig5534" <sig5534@h...> wrote:
> 
> I've been fighting trying to get this damn SPI module to work with 
> some ADC's and DAC's.  These use 16, 24, and 32 bit word sizes.
> 
> As far as I can tell the SPI module only works with Byte data!  I was 
> not able to make it work at all with these ADCs/DACs.  The SPIF flag 
> pops up based on 8 bit data.  What good is any of this SPI register 
> setup if the word size is not 8 bits?
> 
> Finally I shut the SPI module down and reprog the pins for GPIO.  I 
> wrote my own manual SPI control routines.  My ADCs and DACs started 
> working the first time!  Very easy, stupid simple.
> 
> I don't get it.  There are all these complex registers and flags 
> trying to track errors and status in this SPI module, but it only 
> supports 8 bit data!  Geez, they have plenty of extra bits around 
> where they could have used a few to define a word size.
> 
> I just can't understand what the point is of having a 32bit MCU and 
> crippling the legs of the SPI module to 8 bits.  Why????
> 
> Maybe I missed something, but I don't see anyway to use this SPI 
> module unless all your data is 8 bits.  But the ADCs and DACs don't 
> work that way.  They want all the bits shifted out contiguous: 16, 
> 24, 32, whatever.
> 
> Chris.