Manometer project continued.

[aajgss]

OK, I have the math to a point where it is calculating somewhere near the number I want.

I have connected the hardware. A MPXV4006 pressure sensor which is connected to a MCP3201 ADC which in turn goes via SPI to a 18F14K50 PIC.

Attached is the setup.

' Variables
SCK     VAR PORTB.6 'Clock pin
CS     VAR PORTC.1 'Chip Select Active low
SDI     VAR PORTB.4 'Data In pin
 
 COUNTS var word
 lbit var COUNTS.byte0
 hbit var COUNTS.byte1
'-------------------------------------------------------------------------------
Define LOADER_USED 1
INCLUDE "MODEDEFS.BAS"
DEFINE OSC 12
DEFINE SHIFT_PAUSEUS 10  'gives a 50KHZ clock pulse                                                       
TRISB.4 =1               ' set PortB 4 as an input
TRISB.6 =0               ' set PortB 6 as an output         
 
TRISC =%00000000                        
knots var long
knotsRem var long
HIGH CS
START:
 
LOW CS 
PAUSEUS 50 'delay after CS goes low for conversion to start. Probably not needed
SHIFTIN SDI,SCK,2,[counts\14]  ' using mode 2 for SPI
high cs 
 
'knots = ((SQR(counts*100))*1563)/10000
'knotsRem = (SQR(counts*100)*1563)//10000
'serout2  portb.7,396,[ #Knots,".",dec3 knotsRem,"  ",#counts,",","   Knots",13,10]
serout2  portb.7,396,[ #lbit,"   ",#hbit,13] ' Just send out ADC value to start
GOTO START:
END

I can see the data coming in on the scope. If I move the plunger of the syringe, I get the data changing, but always get a Zero when I send it out to the serial port.

I havent used the shiftin command before. It looks right so I'm not sure where I am going wrong.

Any help would be appreciated.

TIA
aajgss