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ADC using interrupts

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Pilot

Joined: 06 Jul 2004
Posts: 9

ADC using interrupts

Posted: Sun Aug 01, 2004 11:47 am

Hi,
I did 3 channel adc

Code:

#include "C:\PicPrj\CCSC\LCD_I2C_ADC\LCD_I2C_ADC.h"
#include <LCD.C>
// #int_AD

/*
AD_isr()
{

}
*/

#define ADCCONST 5.0/1024.0

void main()
{
int i;
float value1, value2, value3;

setup_adc_ports(AN0_AN1_AN2_AN3_AN4);
setup_adc(ADC_CLOCK_DIV_2);
setup_psp(PSP_DISABLED);
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
lcd_init();
// enable_interrupts(INT_AD);
// enable_interrupts(GLOBAL);

lcd_putc("\fLCD Ok!\n");

do {
delay_ms(100);
set_adc_channel( 0 );
value1 = Read_ADC()*ADCCONST;

delay_ms(100);
set_adc_channel( 1 );
value2 = Read_ADC()*ADCCONST;

delay_ms(100);
set_adc_channel( 2 );
value3 = Read_ADC()*ADCCONST;

printf(LCD_PUTC,"\n%4.2f %4.2f %4.2f",value3,value2,value1);

} while (TRUE);
}

but i want to use interrupt for ADC conversion and dont know how to do it with 3 channels? How i will know which channel is ready for read in the interrupt routine?

Thanks in advance. Ragards.

Pilot

Joined: 06 Jul 2004
Posts: 9

Re: ADC using interrupts

Posted: Sun Aug 01, 2004 2:51 pm

Pilot wrote:

Hi,
I did 3 channel adc
but i want to use interrupt for ADC conversion and dont know how to do it with 3 channels? How i will know which channel is ready for read in the interrupt routine?

Thanks in advance. Ragards.

I could do it on my self Very Happy

Code:

#include "C:\PicPrj\CCSC\LCD_I2C_ADC\LCD_I2C_ADC.h"
#include <LCD.C>

#define ADCCONST 5.0/1024

float value[3];

#int_AD
AD_isr()
{
static unsigned char ch=2;

value[ch] = Read_ADC(ADC_READ_ONLY)*ADCCONST;

printf(LCD_PUTC,"\n%u %4.2f %4.2f %4.2f",ch,value[2],value[1],value[0]);

if (ch==0) ch=3;
set_adc_channel(--ch);
Read_ADC(ADC_START_ONLY);
}

void main()
{
setup_adc_ports(AN0_AN1_AN2_AN3_AN4);
setup_adc(ADC_CLOCK_DIV_2);
setup_psp(PSP_DISABLED);
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
lcd_init();
enable_interrupts(INT_AD);
enable_interrupts(GLOBAL);

lcd_putc("\fLCD Ok!\n");

set_adc_channel( 2 );
Read_ADC(ADC_START_ONLY);;

do {
} while (TRUE);
}

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