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PIC16f877A and timer0
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wind88



Joined: 29 Dec 2010
Posts: 37

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PostPosted: Fri Jan 14, 2011 10:49 pm     Reply with quote
thank you Ttelmah

Code:
#include <16F877A.h>
#device adc=10
#use delay(clock=20000000)
#define   XTAL_FREQ   200000000
#include <flex_lcd.c>

#FUSES HS, NOWDT,NOPROTECT,NOLVP,NOWDT,PUT,NOBROWNOUT
#include <stdio.h>
#define MAX_VALUE 200
#define CCW_ROTATION MAX_VALUE - 25
#define CW_ROTATION MAX_VALUE - 15
#define STOP_ROTATION MAX_VALUE
#define THRESHOLD_VALUE 25

#define A0 PIN_A0
#define A1 PIN_A1
#define B1 PIN_B1
unsigned char pulse_max=0;
unsigned char pulse_top=0;
unsigned char top_value=0 ;



#INT_TIMER0
void TIMER0_isr(void)
{
   
   if(INT_TIMER0)// TIMER0 Interrupt Flag
   {               
    pulse_max++;            // Pulse Max Increment
    pulse_top++;            // Pulse Top Increment

    /* MAX_VALUE=200 turn off the pulse */
    if (pulse_max >= MAX_VALUE) {
    pulse_max=0;
    pulse_top=0;
    output_low(B1);                // Turn off RB1
    }

 
    if (pulse_top == top_value) {
    output_high(B1);                // Turn On RB1
    }

  }
}
void main(void)
{
   
 
  signed int16 ldr_left=0 ;
  signed int16 ldr_right=0 ;
  signed int16 ldr_diff ;

   port_b_pullups(TRUE);
   setup_adc_ports(ALL_ANALOG );
   setup_adc(ADC_CLOCK_DIV_32);
   setup_spi(SPI_SS_DISABLED);
   setup_timer_0(RTCC_INTERNAL|RTCC_DIV_2);
   setup_timer_1(T1_DISABLED);
   setup_timer_2(T2_DISABLED,0,1);
   lcd_init();
// Init Servo Pulse
 
   pulse_max=0;
   pulse_top=0;
   top_value = MAX_VALUE; // top_value = MAX_VALUE: Servo Motor Stop

   // Init TIMER0: Period: Fosc/4 x Prescaler x TMR0

   enable_interrupts(INT_TIMER0);
   enable_interrupts(GLOBAL);
   

      // Read the ADC here
while(1){
         
 
               
         set_adc_channel(0);
         delay_us(10);
         ldr_left=read_adc();
         printf(lcd_putc, "\f value = %ld \n",ldr_left);   

         set_adc_channel(1);
         delay_us(10);     
         ldr_right=read_adc();
         printf(lcd_putc, "value = %ld ",ldr_right);
         
          // Get the different
      ldr_diff = ldr_left - ldr_right;   

      if ((ldr_diff >= -THRESHOLD_VALUE) && (ldr_diff <= THRESHOLD_VALUE))
      {
         output_low(B1);     // Stop the Servo Motor
      }
      else
      {
         if (ldr_diff > THRESHOLD_VALUE)
         {
            top_value = CCW_ROTATION;  // Counterclockwise Rotation
         }
         else
         {
            top_value = CW_ROTATION;   // Clockwise Rotation
         }
      }
   }
}

This code cant turn on the lcd also.
Do you mean that is something is wrong in the timer0 there?
wind88



Joined: 29 Dec 2010
Posts: 37

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PostPosted: Sat Jan 15, 2011 3:19 am     Reply with quote
Quote:
#include <16F877A.h>
#device adc=10
#use delay(clock=20000000)
#define XTAL_FREQ 200000000

#include <flex_lcd.c>

#FUSES HS, NOWDT,NOPROTECT,NOLVP,NOWDT,PUT,BROWNOUT
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#define MAX_VALUE 200
#define CCW_ROTATION MAX_VALUE - 25
#define CW_ROTATION MAX_VALUE - 15
#define STOP_ROTATION MAX_VALUE
#define THRESHOLD_VALUE 25

#define A0 PIN_A0
#define A1 PIN_A1
#define B1 PIN_B1
unsigned char pulse_max=0;
unsigned char pulse_top=0;
unsigned char top_value=0 ;



#INT_TIMER0
void TIMER0_isr(void)
{

if(INT_TIMER0)// TIMER0 Interrupt Flag
{
pulse_max++; // Pulse Max Increment
pulse_top++; // Pulse Top Increment

/* MAX_VALUE=200 turn off the pulse */
if (pulse_max >= MAX_VALUE) {
pulse_max=0;
pulse_top=0;
output_low(B1); // Turn off RB1
}


if (pulse_top == top_value) {
output_high(B1); // Turn On RB1
}

}
}
void main(void)
{


signed int16 ldr_left=0 ;
signed int16 ldr_right=0 ;
signed int16 ldr_diff ;

port_b_pullups(TRUE);
lcd_init();
printf(lcd_putc, "\f value = %ld \n",ldr_left);
printf(lcd_putc, "value = %ld ",ldr_right);

setup_adc_ports(ALL_ANALOG );
setup_adc(ADC_CLOCK_DIV_32);
setup_spi(SPI_SS_DISABLED);
setup_timer_0(RTCC_INTERNAL|RTCC_8_BIT|RTCC_DIV_2);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);

// Init Servo Pulse

pulse_max=0;
pulse_top=0;
top_value = MAX_VALUE; // top_value = MAX_VALUE: Servo Motor Stop

// Init TIMER0: Period: Fosc/4 x Prescaler x TMR0

enable_interrupts(INT_TIMER0);
enable_interrupts(GLOBAL);


// Read the ADC here
while(true){


set_adc_channel(0);
delay_us(10);
ldr_left=read_adc();
//printf(lcd_putc, "\f value = %ld \n",ldr_left);

set_adc_channel(1);
delay_us(10);
ldr_right=read_adc();
//printf(lcd_putc, "value = %ld ",ldr_right);

// Get the different
ldr_diff = ldr_left - ldr_right;

if ((ldr_diff >= -THRESHOLD_VALUE) && (ldr_diff <= THRESHOLD_VALUE))
{
output_low(B1); // Stop the Servo Motor
}
else
{
if (ldr_diff > THRESHOLD_VALUE)
{
top_value = CCW_ROTATION; // Counterclockwise Rotation
}
else
{
top_value = CW_ROTATION; // Clockwise Rotation
}
}

}
}

If I put the printf after the lcd_init();
the value is shown in the screen but it only show value=0 (I think it is wrong since the value is taken before the conversion).
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