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LTC2400 working code...

 
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Erol
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LTC2400 working code...
PostPosted: Tue Aug 08, 2006 6:38 pm     Reply with quote
This Code is working with LTC2400 (24 bit, 8 pin ADC)
if you need maybe will can optimize for Conversion time....
Working circuit at :

hxxp://img102.imageshack.us/img102/8969/img1619nr7.jpg

Code:
#include "C:\PROGRA~1\PICC\DEVICES\16F628a.H"
#fuses HS,NOWDT,PUT,BROWNOUT,NOPROTECT,noMCLR,NOLVP
#use delay(clock=8000000,restart_wdt)

#define LTC_CS       PIN_A0      // LTC de 5
#define LTC_SCK      PIN_A2      // LTC de 7
#define LTC_SDA      PIN_A3      // LTC de 6

#byte CMCON0  = 0x19

#define use_portb_lcd TRUE
#include "LCD.C"

int32 degisken=0;
unsigned int ADCBuffer[3];
float gerilim = 0;
float Vref = 4.0962;          // Ölçülen Vref
float Ratio = 45.5934;        // 100K ve 2K2 nin ölçülen oranı

#define FULLSCALE 16777216    // 2^24

int1 ltc_clock()
{
   int1 in=0;
   
   output_high(LTC_SCK);    in=input(LTC_SDA);   delay_ms(5);
   output_low(LTC_SCK);     delay_ms(5);
   
   return(in);
}


void LTC_2400_read()
{
   unsigned int i=0;

   output_low(LTC_SCK);       // clock 0 da olmalı
   output_low(LTC_CS);        // CS ile IC yi seçtik.
   delay_ms(70);

   ltc_clock();   // bit 31   BOŞ
   ltc_clock();   // bit 30   BOŞ
   ltc_clock();   // bit 29   SIG
   ltc_clock();   // bit 28   EXR

   ADCbuffer[0]=0;
   ADCbuffer[1]=0;
   ADCbuffer[2]=0;

   for (i = 1; i <= 24; i++)  shift_left(ADCbuffer,3,ltc_clock());

   output_high(LTC_CS);
   delay_ms(50);

   degisken = make32(ADCBuffer[2],ADCBuffer[1],ADCBuffer[0]);

}

void main()
{
   disable_interrupts(GLOBAL);
   CMCON0=7;
   setup_ccp1(CCP_OFF);
   setup_timer_2(T2_DISABLED,0,1);
   delay_ms(10);
   lcd_init();

   printf(lcd_putc,"\f    LTC2400     ");
   printf(lcd_putc,"\nGELISTIRME KITI ");

   output_high(LTC_CS);
   delay_ms(2000);


while(TRUE)
{
   LTC_2400_read();

   gerilim = (float) degisken / FULLSCALE;
   gerilim *= Vref;
   gerilim *= Ratio;
   
   printf(lcd_putc,"\f ADC : %.3f V",gerilim);
   delay_ms(250);
}
}
kender



Joined: 09 Aug 2004
Posts: 768
Location: Silicon Valley

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PostPosted: Wed Aug 09, 2006 4:01 pm     Reply with quote
You have a 50ms delay in the LTC_2400_read() function. Do you really need it? It, obviously, slows things down.
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