[sdiy] SPI Digital Potentiomters and PIC 18.. not working.. help!

[Fredrik Carlqvist]

Well, since there are four binary settings, you have 16:1 odds for making it
work the first time ;-)

Most probable is clock phase errors. I never get those right the first time.
We'll see cause i'm setting up a microchip DAC on the PIC18 SSP port soon...


Let's compare settings!


Fredrik C


-----Original Message-----
From: owner-synth-diy at dropmix.xs4all.nl
[mailto:owner-synth-diy at dropmix.xs4all.nl] On Behalf Of Bill Berzinskas
Sent: den 15 mars 2005 03:51
To: Bill Berzinskas; Jay Schwichtenberg; synth-diy at dropmix.xs4all.nl
Subject: Re: [sdiy] SPI Digital Potentiomters and PIC 18.. not working..
help!

Well.. I got this working..    not as i would have liked to.. but it is
working.. i found the application note on their site for SPI to their
digital potentiometers via a pic16f877..  which is a diff processor then i'm
using, but most of the code is the same.. after making the appropriate
changes to the code (registers n such), i loaded it up, and have been
hacking at it all day..  then i ran across another sample code in there..
for firmware implementation..   so that what i tried.. works like a charm..
any ideas why my hardware SPI port never worked tho? 
 

	----- Original Message ----- 
	From: Bill Berzinskas <mailto:wberzinskas at nc.rr.com>  
	To: Jay Schwichtenberg <mailto:jays at aracnet.com>  ;
synth-diy at dropmix.xs4all.nl 
	Sent: Monday, March 14, 2005 11:42 AM
	Subject: Re: [sdiy] SPI Digital Potentiomters and PIC 18.. not
working.. help!

	this is how my mssp registers are set.. 
	the other hardware does work..  i've got an lcd hooked up
	to it as well..   
	 
	    movlw  b'01000000'  
	    movwf  SSPSTAT 
	    movlw  b'00100001' 
	    movwf  SSPCON1 

		----- Original Message ----- 
		From: Jay Schwichtenberg <mailto:jays at aracnet.com>  
		To: synth-diy at dropmix.xs4all.nl 
		Sent: Monday, March 14, 2005 10:40 AM
		Subject: RE: [sdiy] SPI Digital Potentiomters and PIC 18..
not working.. help!

		Not a lot of info here Bill.
		 
		Do you have any indication that any of the program that you
put in the unit is working (ie does the hardware work)?
		 
		Did you program the MSSP and clocks correctly for SPI?
		 
		You have to get the MSSP port programmed correctly before
anything will happen.
		 
		Good luck!
		Jay S.

			-----Original Message-----
			From: owner-synth-diy at dropmix.xs4all.nl
[mailto:owner-synth-diy at dropmix.xs4all.nl]On Behalf Of Bill Berzinskas
			Sent: Monday, March 14, 2005 6:50 AM
			To: synth-diy at dropmix.xs4all.nl
			Subject: [sdiy] SPI Digital Potentiomters and PIC
18.. not working.. help! 
			
			
			I'm using a microhip spi digital potentiometer..
i'm sending data as follows
			 
			CS high > low
			write command byte (00010001)
			write data byte
			cd low > high
			 
			and nothing is working..   what am i missing?    i'm
sending the data from a pic18f
			 
			please help