amitroy1984
Newbie level 1
hello,
i am trying to write a program for dspic30f4012.
I have a requirement to call a adcvalue() function
within an interrupt routine of timer1. This adcvalue()
function needs to switch on the ADC. Load the digital
values of analog signals at AN0 and AN1 to variables
defined as data1, data2. And then again turn down
the ADC. This cycle repeats each time within the timer1 ISR.
Can anyone tell me how to do it.(need to know adc setting and adcvalue function)
I wrote the following code but it doesnt work.
My main prog is as follows
i am trying to write a program for dspic30f4012.
I have a requirement to call a adcvalue() function
within an interrupt routine of timer1. This adcvalue()
function needs to switch on the ADC. Load the digital
values of analog signals at AN0 and AN1 to variables
defined as data1, data2. And then again turn down
the ADC. This cycle repeats each time within the timer1 ISR.
Can anyone tell me how to do it.(need to know adc setting and adcvalue function)
I wrote the following code but it doesnt work.
Code:
//ADC initialisation
void AD_set() // ***** A to D (A/D) Settings
{
ADPCFG = 0x0038; // Configure pins AN(3-5)/RB(3-5) into Digital
// I/O mode AN(0-2) pins are in Analog mode
// ADCON1bits.ADSIDL= 0;
// ADCON1bits.FORM= 0;
// ADCON1bits.SSRC= 7;
// ADCON1bits.SAMP= 1;
ADCON1= 0x00E0;
ADCHS = 0x0000; //
ADCSSL = 0x0003;
// ADCON3bits.SAMC= 8;
// ADCON3bits.ADRC= 0;
// ADCON3bits.ADCS= 1;
ADCON3= 0x0F00;
// ADCON2bits.VCFG= 0;
// ADCON2bits.CSCNA= 1;
// ADCON2bits.SMPI= 1;
// ADCON2bits.BUFM= 0;
// ADCON2bits.ALTS= 0;
ADCON2= 0x0404;
//ADCON2 = 0x0004; // Interrupt after every 2 samples
}My main prog is as follows
Code:
// main-prog.c
#include<p30f4012.h>
#include "settings-prog.h"
_FOSC(CSW_FSCM_OFF & XT); // To use the external crystal
_FWDT(WDT_OFF); // To disable the watchdog timer
void send_data(int);
int AD_value(); // Declare the AD value reading function
int AD_value1();
float R, P;
void main()
{
uart_set(); // Initialise UART settings
AD_set(); // Initialise ADC settings
timer1_set(T); // Initialise Timer-1 settings & start timer
TRISEbits.TRISE8 = 0; // RE8 is configured as output
// Continue until stop the power
for(;;);
}// End of main()
// Interrupt service routine (ISR) for interrupt from Timer1
void __attribute__((interrupt, no_auto_psv)) _T1Interrupt (void)
{
IFS0bits.T1IF = 0; // Clear timer 1 interrupt flag
uart_tx(9);
P= AD_value1();
send_data(P);
uart_tx(9); // Space between 2 pieces of data.
R= AD_value();
send_data(R);
} // End of ISR of Timer 1
int AD_value()
{
int ADCValue;
ADCON1bits.ASAM= 1;
//IEC0bits.ADIE= 0;
IFS0bits.ADIF= 0;
ADCON1bits.ADON= 1;
while (!IFS0bits.ADIF);
ADCON1bits.ASAM=0;
ADCValue= ADCBUF0;
return(ADCValue);
}// End of AD_value()
int AD_value1()
{
int ADCValue1;
ADCON1bits.ASAM= 1;
//IEC0bits.ADIE= 0;
IFS0bits.ADIF= 0;
ADCON1bits.ADON= 1;
while (!IFS0bits.ADIF);
ADCON1bits.ASAM=0;
ADCValue1= ADCBUF1;
return(ADCValue1);
}// End of AD_value()
void send_data(int s_data)
{
int s;
if(s_data < 0)
{
// Send the negative sign (ASCII is 45)
uart_tx(45);
s_data = -1*s_data;
}
// Digit with the position value of 100
s = s_data/100;
uart_tx(s+48);
// Digit with the position value of 10
s_data = s_data - (s *100);
s = s_data/10;
uart_tx(s+48);
// Digit with the position value of 1
s_data = s_data - (s *10);
uart_tx(s_data+4);
}// End of send_data()
