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Erol
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| LTC2400 working code... |
 Posted: Tue Aug 08, 2006 6:38 pm |
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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; // �l��len Vref
float Ratio = 45.5934; // 100K ve 2K2 nin �l��len 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 se�tik.
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);
}
} |
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kender
Joined: 09 Aug 2004
Posts: 768
Location: Silicon Valley
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| Posted: Wed Aug 09, 2006 4:01 pm |
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| 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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