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16F1507 keep entering INT_RA3

 
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edi



Joined: 22 Dec 2003
Posts: 82

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16F1507 keep entering INT_RA3
PostPosted: Thu Feb 14, 2013 12:48 pm     Reply with quote
My circuit is connected to a 7seg and has a TACT switch on RA3.
RA3 should act as wake up from sleep and other press function during operation.
My problem is when I press the TACT after the first sleep the INT_RA3 is entring to an endless loop.
Any idea?
Compiler 4.128 and using PICkit3 for programimg.
Code:

#include <16F1507.h>
#device adc=16

#FUSES NOWDT                    //No Watch Dog Timer
#FUSES INTRC_IO                 //Internal RC Osc, no CLKOUT
#FUSES WDT_SW                   //No Watch Dog Timer, enabled in Software
#FUSES NOMCLR                   //Master Clear pin used for I/O
#FUSES NOBROWNOUT               //No brownout reset
#FUSES NOLVP                    //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O

#use delay(int=4000000)

short ON=1;
short OFF=0;
int16 Ton=500;    // 7seg segments on time (function of refresh rate vs. on time)
int8  sensetivity=5;  // number of ADC reads
int16 Sensor_level=3000;  // ADC level threshold ut of 12bit resolution
int8 count=0;
short sleep_mode;

#byte porta=0x0c
#byte trisa=0x8c
#byte portb=0x0d
#byte trisb=0x8d
#byte portc=0x0e
#byte trisc=0x8e

#bit DIGITR = portc.0
#bit DIGITL = porta.2
#bit SEG_A = porta.5
#bit SEG_B = porta.4
#bit SEG_C = portc.5
#bit SEG_D = portc.4
#bit SEG_E = portc.3
#bit SEG_F = portb.7
#bit SEG_G = portb.5
#bit TACT = porta.3

void init()
{
   porta = 0b00001111;   // |     |     | AAA | BBB | TCT | LFT | PGC | SEN |
   trisa = 0b00001001;   // |     |     | OUT | OUT |  IN | OUT | OUT |  IN |
   portb = 0b01011111;   // | FFF |     | GGG |     |     |     |     |     |
   trisb = 0b00000000;   // | OUT | OUT | OUT | OUT | OUT | OUT | OUT | OUT |
   portc = 0b11000111;   // | SDO | SS~ | CCC | DDD | EEE | DOT | LED | RGT |
   trisc = 0b00000000;   // | OUT | OUT | OUT | OUT | OUT | OUT | OUT | OUT |
   PORT_A_PULLUPS(0b00001000); //
}


void debugg()
{
         DIGITR = 0;
         DIGITL = 1;
         SEG_G = ON;
         delay_ms(80);
         SEG_G = OFF;
         delay_ms(200);
         SEG_G = ON;
         delay_ms(80);
         SEG_G = OFF;
         delay_ms(200);
         SEG_G = OFF;
         DIGITL = 1;
         DIGITR = 1;
}

void debugd()
{
         DIGITR = 0;
         DIGITL = 1;
         SEG_D = ON;
         delay_ms(80);
         SEG_D = OFF;
         delay_ms(200);
         SEG_D = ON;
         delay_ms(80);
         SEG_D = OFF;
         delay_ms(200);
         SEG_D = OFF;
         DIGITL = 1;
         DIGITR = 1;
}


void display_bye()
{
   SET_TIMER1(0x4001);
   while (GET_TIMER1() > 0x4000)
   {
      DIGITL = 1;
      DIGITR = 0;
      SEG_B = ON;
      delay_us(Ton);
      SEG_B = OFF;
      SEG_C = ON;
      delay_us(Ton);
      SEG_C = OFF;
      SEG_D = ON;
      delay_us(Ton);
      SEG_D = OFF;
      SEG_F = ON;
      delay_us(Ton);
      SEG_F = OFF;
      SEG_G = ON;
      delay_us(Ton);
      SEG_G = OFF;

      DIGITR = 1;
      DIGITL = 0;
      SEG_C = ON;
      delay_us(Ton);
      SEG_C = OFF;
      SEG_D = ON;
      delay_us(Ton);
      SEG_D = OFF;
      SEG_E = ON;
      delay_us(Ton);
      SEG_E = OFF;
      SEG_F = ON;
      delay_us(Ton);
      SEG_F = OFF;
      SEG_G = ON;
      delay_us(Ton);
      SEG_G = OFF;

   }
}


void Segment (int seg_char)
{
   switch (seg_char)
   {
      case 0:
      {
         SEG_A = ON;
         delay_us(Ton);
         SEG_A = OFF;
         SEG_B = ON;
         delay_us(Ton);
         SEG_B = OFF;
         SEG_C = ON;
         delay_us(Ton);
         SEG_C = OFF;
         SEG_D = ON;
         delay_us(Ton);
         SEG_D = OFF;
         SEG_E = ON;
         delay_us(Ton);
         SEG_E = OFF;
         SEG_F = ON;
         delay_us(Ton);
         SEG_F = OFF;
         }
         break;
      case 1:
      {
         SEG_B = ON;
         delay_us(Ton);
         SEG_B = OFF;
         SEG_C = ON;
         delay_us(Ton);
         SEG_C = OFF;
         }
         break;
      case 2:
      {
         SEG_A = ON;
         delay_us(Ton);
         SEG_A = OFF;
         SEG_B = ON;
         delay_us(Ton);
         SEG_B = OFF;
         SEG_D = ON;
         delay_us(Ton);
         SEG_D = OFF;
         SEG_E = ON;
         delay_us(Ton);
         SEG_E = OFF;
         SEG_G = ON;
         delay_us(Ton);
         SEG_G = OFF;
         }
         break;
      case 3:
      {
         SEG_A = ON;
         delay_us(Ton);
         SEG_A = OFF;
         SEG_B = ON;
         delay_us(Ton);
         SEG_B = OFF;
         SEG_D = ON;
         delay_us(Ton);
         SEG_D = OFF;
         SEG_C = ON;
         delay_us(Ton);
         SEG_C = OFF;
         SEG_G = ON;
         delay_us(Ton);
         SEG_G = OFF;
         }
         break;
      case 4:
      {
         SEG_B = ON;
         delay_us(Ton);
         SEG_B = OFF;
         SEG_C = ON;
         delay_us(Ton);
         SEG_C = OFF;
         SEG_F = ON;
         delay_us(Ton);
         SEG_F = OFF;
         SEG_G = ON;
         delay_us(Ton);
         SEG_G = OFF;
         }
         break;
      case 5:
      {
         SEG_A = ON;
         delay_us(Ton);
         SEG_A = OFF;
         SEG_F = ON;
         delay_us(Ton);
         SEG_F = OFF;
         SEG_D = ON;
         delay_us(Ton);
         SEG_D = OFF;
         SEG_C = ON;
         delay_us(Ton);
         SEG_C = OFF;
         SEG_G = ON;
         delay_us(Ton);
         SEG_G = OFF;
         }
         break;
      case 6:
      {
         SEG_A = ON;
         delay_us(Ton);
         SEG_A = OFF;
         SEG_C = ON;
         delay_us(Ton);
         SEG_C = OFF;
         SEG_D = ON;
         delay_us(Ton);
         SEG_D = OFF;
         SEG_E = ON;
         delay_us(Ton);
         SEG_E = OFF;
         SEG_F = ON;
         delay_us(Ton);
         SEG_F = OFF;
         SEG_G = ON;
         delay_us(Ton);
         SEG_G = OFF;
         }
         break;
      case 7:
      {
         SEG_A = ON;
         delay_us(Ton);
         SEG_A = OFF;
         SEG_B = ON;
         delay_us(Ton);
         SEG_B = OFF;
         SEG_C = ON;
         delay_us(Ton);
         SEG_C = OFF;
         }
         break;
      case 8:
      {
         SEG_A = ON;
         delay_us(Ton);
         SEG_A = OFF;
         SEG_B = ON;
         delay_us(Ton);
         SEG_B = OFF;
         SEG_C = ON;
         delay_us(Ton);
         SEG_C = OFF;
         SEG_D = ON;
         delay_us(Ton);
         SEG_D = OFF;
         SEG_E = ON;
         delay_us(Ton);
         SEG_E = OFF;
         SEG_F = ON;
         delay_us(Ton);
         SEG_F = OFF;
         SEG_G = ON;
         delay_us(Ton);
         SEG_G = OFF;
         }
         break;
      case 9:
      {
         SEG_A = ON;
         delay_us(Ton);
         SEG_A = OFF;
         SEG_B = ON;
         delay_us(Ton);
         SEG_B = OFF;
         SEG_C = ON;
         delay_us(Ton);
         SEG_C = OFF;
         SEG_D = ON;
         delay_us(Ton);
         SEG_D = OFF;
         SEG_F = ON;
         delay_us(Ton);
         SEG_F = OFF;
         SEG_G = ON;
         delay_us(Ton);
         SEG_G = OFF;
         }
         break;
      case 0xa:
      {
         SEG_G = ON;
         delay_us(10);
         SEG_G = OFF;
      }
      break;
      default:
      {
      }
      break;
  }
   
}


void display_7seg (int disp)
{
   unsigned int8 yehidot, asarot;

   SET_TIMER1(0x4001);
   while (GET_TIMER1() > 0x4000)
   {
         DIGITL = 1;
         DIGITR = 0;
         yehidot = disp%10;
         Segment (yehidot);
         DIGITR = 1;
         DIGITL = 0;
         asarot = disp/10;
         Segment (asarot);
   }
}


#INT_RA
void RA3_isr()
{
   int8 onoff_time;
   onoff_time=TACT; // clear the RA3 INT
 debugg(); //just to indicate that interrupt routine is entered
   disable_interrupts(GLOBAL); // all interrupts OFF
   onoff_time=0;
   if ((!TACT) && (!sleep_mode))
   {
      display_7seg(count);
      while (!TACT)
      {
         display_7seg(count);
         onoff_time++;
         if (onoff_time>=6)
         {
            sleep_mode=true;
            return;
         }
      }
   }
   sleep_mode=false;
 debugd(); //just to indicate that interrupt routine is exit
}



void main()
{
   unsigned int8 i;
   unsigned int16 mean=0, blink=0, value;
   disable_interrupts(GLOBAL); // all interrupts OFF
   disable_interrupts(INT_RA); // RA interrupt OFF
//   setup_oscillator(OSC_4MHZ);
   init();
   sleep_mode=true;
   setup_adc_ports(sAN0 || VSS_VDD);
   setup_adc(ADC_CLOCK_INTERNAL);            // Built-in A/D setup function
   set_adc_channel(0);                       // Built-in A/D setup function
   SETUP_TIMER_1(T1_INTERNAL | T1_DIV_BY_8);
   i=porta;       // this is just to clean INT_RA

   CLEAR_INTERRUPT(INT_RA3);
   ENABLE_INTERRUPTS(INT_RA3_H2L);
   enable_interrupts(GLOBAL);
  //   enable_interrupts(PERIPH);

   sleep();

//   display_7seg(33);
   display_7seg(22);
   display_7seg(11);
   display_7seg(0);
   
   while(1)
   {
      if (sleep_mode)
      {
         disable_interrupts(INT_RA3); // RA interrupt OFF
         display_bye();
         display_bye();
//         display_bye();
//         display_bye();
//         display_bye();
//         display_bye();
         count=0;
         CLEAR_INTERRUPT(INT_RA3);
         ENABLE_INTERRUPTS(INT_RA3_H2L);
         sleep();
         display_7seg(33);
         display_7seg(22);
         display_7seg(11);
         display_7seg(0);
      }
      for (i=0; i<sensetivity; i++)
      {
         value = read_adc();                 // Built-in A/D read function
         mean = mean + value;
      }
      mean = mean/i;
      if (mean > Sensor_level)         //This is the mean vlue of the ADC
      {
         count++;
         if (count==100)
            count=99;
         display_7seg(count);
      }
      mean=0;
     
      if (blink == 3800)
      {
      DIGITL = 1;
      DIGITR = 0;
      SEG_G = ON;
      }
      else if (blink==3900)
      {
      DIGITL = 1;
      DIGITR = 0;
      SEG_G = OFF;
      }
      if (blink == 4000)
      {
      DIGITL = 0;
      DIGITR = 1;
      SEG_G = ON;
      }
      else if (blink==4100)
      {
      DIGITL = 0;
      DIGITR = 1;
      SEG_G = OFF;
      blink=0;
      }
      blink++;
     
   }
}
Ttelmah



Joined: 11 Mar 2010
Posts: 19513

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PostPosted: Thu Feb 14, 2013 12:51 pm     Reply with quote
INT_RA3, is an 'interrupt on change' on this chip. These _always_ require that the handler _reads the pin_. Otherwise the interrupt cannot be cleared
As a general comment, the global interrupt flag is already 'off' when you enter an interrupt, and is re-enabled by the hardware when the interrupt exits. You should never disable/enable the global flag inside interrupts.

Best Wishes
edi



Joined: 22 Dec 2003
Posts: 82

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PostPosted: Thu Feb 14, 2013 1:30 pm     Reply with quote
Thanks Ttelmah.
This is the reason I put the line:
Code:

onoff_time=TACT; // clear the RA3 INT

It supposed to read RA3 and clear the interrupt, isn't it?
ckielstra



Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands

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PostPosted: Thu Feb 14, 2013 2:35 pm     Reply with quote
I only had a quick glance at your code and think it is not easy to follow, but have you considered the possibility that the ISR did end? There is a code path in your ISR where a return is done without calling debugd(), leaving your interrupt debug active.
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