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pic spi and ad8400

 
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cyril_fr



Joined: 25 Sep 2005
Posts: 1

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pic spi and ad8400
PostPosted: Sun Sep 25, 2005 12:07 pm     Reply with quote
hi i need your help

I want to write a value from a pic to an AD8400 (digital potentiometer) via spi but that doesn't work i have the correct signals but the ad8400 doesn't work correctely

doc of the
AD8400

my code
Code:

#use delay (clock = 4194304) //Using 4Mhz External clock
#fuses HS, NOWDT, NOPROTECT, NOLVP
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8)

#define CS_SPI      PIN_B2


void main ()
{

int8 Data0,Data1,Analog;
int16 Data;

setup_spi (SPI_MASTER | SPI_L_TO_H | SPI_CLK_DIV_64);

output_high(CS_SPI);

analog= 0x00;


while(TRUE){
   {
   data=0;
   data=data | analog;
   data=data << 6;

   data1=data & 0xff;//lsb
   data0=(data >> 8) & 0xff;//msb

         output_low(CS_SPI);
         delay_us(100);
         spi_write(Data0);
         delay_us(150);
         spi_write(Data1);
         delay_us(150);
         output_high(CS_SPI);

   delay_ms(5000);
   analog = analog + 0x10;

}
}
}


thanks
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sun Sep 25, 2005 12:20 pm     Reply with quote
Why don't you use the CCS driver, AD8400.C ?
It's in this folder:
c:\Program Files\Picc\Drivers


If just have the demo compiler, then you won't have the drivers. In that
case, then use http://www.google.com to search for these keywords:
AD8400 CCS

Then you will find it.
akworob
Guest
PostPosted: Thu May 21, 2009 6:09 am     Reply with quote
Just remove line

Code:
data=data << 6;


This because device takes 10 last bits as value (not first 10bits!)
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