ADuC845 Delay

Hi,

Can you further explain your setup? Are you trying to measure 1000 points within a single period, or are you trying to measure 1000 points at different times?

You mentioned the delay during the configuration of ADC0CON1 and ADCCON2. Did you add a delay before the configuration of the registers?

Regards,

Karl

I am running my code which does the configuration and conversion of ADC values in a for loop (1000 times). 

No, I added delay after configuration of both the registers.

Have you tried removing the delay after configuring both registers?

Yes, I tried removing the delay. But, it is required to put a delay after the configuration of both the registers, otherwise their values are not updated, and it requires more cycles to update their values.

How are you configuring the ADC? What are the values of the ADC registers?

You can try something similar to the ADC configuration in the example code. It doesn't need to update the ADC configuration each time to get the ADC value.

//********************************************************************
//
// Author        : ADI - Apps            www.analog.com/MicroConverter
//
// Date          : 16 October 2003
//
// File          : 847uart.c
//
// Hardware      : ADuC845, ADuC847, ADuC848 (taking into account fact that the ADuC848 is a 16-bit ADC)
//
// Description   : sample program that performs ADC conversions in
//                 continuous mode and sends results to a PC via the
//                 UART. Operates on the RTD (PT100) on the eval board
//				   via Ain1->Ain2 ADC inputs. The switches (S4) on the
//				   eval board must be set as follows to get this program
//				   working correctly...RTD AIN1, RTD AIN2, RTD REFIN+
//				   and RTD REFIN- must be set to ON. All other switches
//				   must be off.
//********************************************************************

#include <stdio.h>
#include <ADuC845.h>    //To use this with an ADuC847 or ADuC848, simply change the
					    //header file to <ADuC847.h> or <ADuC848>

sbit LED = 0x0B4;

void ADC_int () interrupt 6
{
	LED ^= 1;
	printf("\n\n");
	printf("%bX%bX%bX",ADC0H,ADC0M,ADC0L);  //Remove ADC0L when using the ADuC848
    RDY0 = 0;
}

void main (void)
{
 			//Configure UART
    T3CON = 0x83;	//9600 Baud rate
    T3FD = 0x12;
    SCON = 0x52;

			//CONFIGURE ADC AND START CONVERTING....
    ICON = 0x01;	//Turn on IEXC1 source to drive RTD.
    SF = 0x200;
    ADC0CON1 = 0x22;	//Full Buffer, Unipolar, 80mV range.
    ADC0CON2 = 0x4A;	//Refin+/-, Ain1->Ain2
    EADC = 1;           //Enable ADC Interrupt
    EA = 1;             //Enable Global Interrupts
    ADCMODE = 0x23;	// continuous conversion on Main channel on main channel

	//WAIT FOR INTERRUPTS....
	while(1);
}