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I have written the code for perturb and observe(p&o) MPPT algorithm for the microcontroller PIC16F877A in c language, and while compiling, it was showing some errors (like 'Undeclared identifier 'setup_adc' in expression') . Can anyone provide suggestions so that it can be executed in microC.....Please its urgent!!! Refer the code below.

What I have tried:

#if defined(__PCM__)
#include <16F877A.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=16000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)
#endif

#include <touch.c>
#include <string.h>
#include <stdlib.h>

void main(void)
{
signed int direction;
int pwm;
float voltageold;
float powerold;
float measuredpower;
float measuredvoltage;
float measuredcurrent;
float deltav;
float deltap;

voltageold=0;
powerold=0;
pwm=0x1F;
direction=0.001;

setup_adc(ADC_CLOCK_DIV_32);
setup_adc_ports(ALL_ANALOG);

output_low(PIN_C1);           /* set CCP1 output low */

setup_ccp1(ccp_pwm);          /* setup pin CCP1 (RC2) to do PWM */

setup_timer_2(T2_DIV_BY_1,159,1);   /* 25 KHZ */


while(1)
{
delay_ms(1000);
set_adc_channel(0);     /* select RA */
delay_ms(20);            /* wait to read ADC */
measuredvoltage=read_adc();   /* Read the voltage input from ADC channel 0 */

set_adc_channel(1);           /* select RA1 */
delay_ms(20);                 /* wait to read ADC */
measuredcurrent =read_adc();  /* Read the current input from ADC channel 1 */


measuredpower= measuredvoltage * measuredcurrent;

deltav=measuredvoltage-voltageold;
deltap= measuredpower - powerold;

if(deltap==0)
{
	pwm=pwm;
}

else
{
	if (deltap>0)
	{
		if (deltav>0)
		{
			pwm--;
		}
		else
		{
			pwm++;
		}
	}
	else
	{
		if(deltav<0)
		{
			pwm--;
		}
		else
		{
			pwm++;
		}
	}
}

voltageold =measuredvoltage;
powerold=measuredpower;
set_pwm1_duty(pwm);

}
}
Posted
Updated 2-Jun-21 3:10am
v4
Comments
Dave Kreskowiak 1-Jun-21 15:38pm    
Uh, no. We're not here to do your work for you.
Merin Mariam Jose 2-Jun-21 1:45am    
I didn't ask you to do my work. All I did was ask for suggestions. If you are not willing to help, then you could have ignored the question.
Dave Kreskowiak 2-Jun-21 9:50am     CRLF
Actually, you asked people "Can anyone correct the code so that it can be executed in microC". That doesn't sound like suggestions. Yes, we get a LOT of people begging for code to be written for them. This sat on the edge between that and suggestions.
jeron1 1-Jun-21 16:10pm    
You haven't stated that there are any errors. What errors are you refering to?
Merin Mariam Jose 2-Jun-21 1:38am    
It was showing that some statements were undeclared('Undeclared identifier 'setup_adc' in expression p&o.c' to be exact)

1 solution

Not your question, but:

Advice: Learn to indent properly your code, it show its structure and it helps reading and understanding. It also helps spotting structures mistakes.
C++
#if defined(__PCM__)#include <16F877A.h>

#fuses HS, NOWDT, NOPROTECT, NOLVP
#use delay(clock = 16000000)
#use rs232(baud = 9600, xmit = PIN_C6, rcv = PIN_C7)
#endif

#include <touch.c>

#include <string.h>

#include <stdlib.h>

void main(void) {
  signed int direction;
  int pwm;
  float voltageold;
  float powerold;
  float measuredpower;
  float measuredvoltage;
  float measuredcurrent;
  float deltav;
  float deltap;

  voltageold = 0;
  powerold = 0;
  pwm = 0x1F;
  direction = 0.001;

  setup_adc(ADC_CLOCK_DIV_32);
  setup_adc_ports(ALL_ANALOG);

  output_low(PIN_C1); /* set CCP1 output low */

  setup_ccp1(ccp_pwm); /* setup pin CCP1 (RC2) to do PWM */

  setup_timer_2(T2_DIV_BY_1, 159, 1); /* 25 KHZ */

  while (1) {
    delay_ms(1000);
    set_adc_channel(0); /* select RA */
    delay_ms(20); /* wait to read ADC */
    measuredvoltage = read_adc(); /* Read the voltage input from ADC channel 0 */

    set_adc_channel(1); /* select RA1 */
    delay_ms(20); /* wait to read ADC */
    measuredcurrent = read_adc(); /* Read the current input from ADC channel 1 */

    measuredpower = measuredvoltage * measuredcurrent;

    deltav = measuredvoltage - voltageold;
    deltap = measuredpower - powerold;

    if (deltap == 0) {
      pwm = pwm;
    } else {
      if (deltap > 0) {
        if (deltav > 0) {
          pwm--;
        } else {
          pwm++;
        }
      } else {
        if (deltav < 0) {
          pwm--;
        } else {
          pwm++;
        }
      }
    }

    voltageold = measuredvoltage;
    powerold = measuredpower;
    set_pwm1_duty(pwm);

  }
}

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-----
Quote:
Undeclared identifier 'setup_adc' in expression p&o.c

The compiler tells you that it don't know what is setup_adc, your code never tells what it is.
 
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