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INT_RB is not working with 18f45k22(solved)

 
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mdemuth



Joined: 16 Apr 2007
Posts: 71
Location: Stuttgart, Germany

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INT_RB is not working with 18f45k22(solved)
PostPosted: Wed Mar 23, 2011 11:31 am     Reply with quote
Hello there,

I am trying to force an IRQ on pin change on port b.
Code:

// CCS Compiler Version: 4.119

#include <18f45k22.h>      //
#device ADC=10 //
#fuses INTRC_IO,NOWDT,NOPROTECT,BROWNOUT,PUT,MCLR, BORV27
#use delay(clock=64000000)
#use fast_io(b)

// Schaltausgänge
#define LED_GN PIN_B1
#define LED_RT PIN_B0
// Encoder
#define X_SPUR_A  PIN_B4
#define X_SPUR_B  PIN_B5
#define Y_SPUR_A  PIN_B6
#define Y_SPUR_B  PIN_B7
// LCD
#define LCD_DATA_PORT getenv("SFR:PORTD")   
#define LCD_ENABLE_PIN  PIN_E0                                    ////
#define LCD_RS_PIN      PIN_E1                                    ////
#define LCD_RW_PIN      PIN_E2                                    ////
#define LCD_DATA4       PIN_D4                                    ////
#define LCD_DATA5       PIN_D5                                    ////
#define LCD_DATA6       PIN_D6                                    ////
#define LCD_DATA7       PIN_D7
#include "lcd.c"

int8 i=0;
int8 j=0;              // Schleifenzähler

int8 x_new, y_new;
signed int16 x_wert=0;
signed int16 y_wert=0;

#include <Encoder Anzeige.h>

#zero_ram
void main()
{
   setup_oscillator (OSC_64MHZ);
   SETUP_ADC_PORTS(sAN0 | sAN1 | sAN2 | sAN3);
   SETUP_ADC(ADC_CLOCK_INTERNAL);
   SETUP_DAC(DAC_OFF);
   setup_comparator(nc_nc_nc_nc);
   
   SETUP_WDT(WDT_OFF);   //WDT
   RESTART_WDT();      // Initialisierung
   
   set_tris_b (0xf0);
   port_b_pullups(TRUE);
   
   lcd_init();
   
   i=input_b();
   delay_us(10); //ensure line has time to settle
   clear_interrupt(INT_RB);
   delay_us(10); //ensure line has time to settle
   
   enable_interrupts(INT_RB);
   enable_interrupts(GLOBAL);
   
while(1)
  {
  if (input(X_SPUR_A)) x_wert++; // HW works fine, I can read this input
  if (!input(X_SPUR_B)) y_wert++; // HW works fine, I can read thsi input

  lcd_gotoxy(1, 1);
  printf(lcd_putc, "X=%05ld",x_wert);
   
  lcd_gotoxy(1, 2);
  printf(lcd_putc, "Y=%05ld",y_wert);
 
  if (bit_test(i,0))
    {
    output_low(LED_RT);
    output_high(LED_GN);
    }
  else
    {
   
  output_low(LED_GN);
  output_high(LED_RT);
    }
  delay_ms(10);
  } // Ende while 1
 
}           // Ende main

#INT_RB
  void IRQ_XY()
    {
    j=input_b(); // to clear the IRQ
    i++; // i remains 0
    lcd_gotoxy(12, 1);
    printf(lcd_putc, "%03u",i);
    }

No success so far, what is wrong?

Thanks in advance!

Michael

Last edited by mdemuth on Mon Mar 28, 2011 3:27 am; edited 1 time in total
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Wed Mar 23, 2011 12:33 pm     Reply with quote
Make a much more simple test program. Remove all the ADC code,
and the WDT code, and remove all the code in the while() loop.
Just test only the #int_rb problem. If you make a small program
and it still doesn't work, then I'll look at it.

Also, describe the input signal that is supposed to cause the #int_rb
interrupt. What are the voltage levels of this signal (high and low levels) ?
What is the Vdd voltage of the PIC ?

Here is a small test program for #int_rb on pin B7 only:
http://www.ccsinfo.com/forum/viewtopic.php?t=41951&start=1

Possible compiler bugs that could cause the problem, with fixes:
http://www.ccsinfo.com/forum/viewtopic.php?t=40980
mdemuth



Joined: 16 Apr 2007
Posts: 71
Location: Stuttgart, Germany

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PostPosted: Thu Mar 24, 2011 2:18 am     Reply with quote
Hi PCM programmer,

I made a very simple program:
Code:

//// CCS Compiler Version: 4.119

#include <18f45k22.h>      //
#device ADC=10 //

#fuses INTRC_IO,NOWDT,NOPROTECT,BROWNOUT,PUT,MCLR, BORV27
#use delay(clock=64000000)
#use fast_io(b)

#define LED_RT PIN_B0
#define X_SPUR_A  PIN_B4

#byte IOCB = 0xF7D
#byte ANSEL = 0xF7E
#byte ANSELH = 0xF7F


int8 j=0;

void flash_led() // flashes LEDs
   {
   for (j=0; j<10;j++)       
      {
      output_toggle(LED_RT);
      delay_ms(100);
      }
    }
#zero_ram
void main()
{
   setup_oscillator (OSC_64MHZ);
   setup_comparator(nc_nc_nc_nc);
   SETUP_WDT(WDT_OFF);   //WDT

   IOCB = 0xF0;
   ANSEL = 0;
   ANSELH = 0;

   set_tris_b (0xf0);
   port_b_pullups(TRUE);
   
   j=input_b(); // read the inputs and clear the IRQ
   clear_interrupt(INT_RB); 
   enable_interrupts(INT_RB);
   enable_interrupts(GLOBAL);
   
 // flash once to check this subroutine
   flash_led();
// works fine => LED flashes   
   while(1)
      {
      if (input(X_SPUR_A)) output_low(LED_RT); 
      else output_high(LED_RT);                 
      delay_ms(100);
// LED has same state as input => HW is OK
      } // Ende while 1
 
}           // Ende main

#INT_RB
  void IRQ_XY()
    {
    j=input_b(); // to clear the IRQ
    flash_led(); // IRQ should force flashing, but does not!
    }

VDD=5V Input is a simple switch.
#INT_RB is never called.

More assistance needed.....

Michael
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Thu Mar 24, 2011 3:11 pm     Reply with quote
I modified the program and now it works. The LED flashes when the
program starts. Then when you push a button on pin B4, the LED will
flash again. The main problem is that in vs. 4.119, the IOCB register
address is incorrect.
Code:

#include <18F45k22.h>   
#fuses INTRC_IO,NOWDT,NOPROTECT,BROWNOUT,PUT,MCLR, BORV27,NOPBADEN
#use delay(clock=4000000)

#define LED_RT    PIN_B0
#define X_SPUR_A  PIN_B4


void setup_IOCB(int8 mask)
{
#byte IOCB = 0xF62   // Register address for 18F45K22

IOCB = mask;
}

//----------------------------
void flash_led(void) 
{
int8 j=0;

for(j=0; j<10;j++)       
   {
    output_toggle(LED_RT);
    delay_ms(100);
   }


}

//------------------------------
#int_rb
void IRQ_XY(void)
{
int temp;

flash_led(); 

temp = input(PIN_B4); // To clear mismatch condition
}
 

//============================================
void main()
{
int temp;

output_low(LED_RT);  // LED is initially Off

port_b_pullups(0x10);   // Enable pull-up on pin B4 only
   
temp = input(PIN_B4);   // Read Pin B4 to clear mismatch condition
clear_interrupt(INT_RB); 
enable_interrupts(INT_RB4); // Enable int-on-change for pin B4 only
setup_IOCB(0x10);    // *** Fixes bug with ASM code for line above
enable_interrupts(GLOBAL);
   
flash_led();

while(1);
}
mdemuth



Joined: 16 Apr 2007
Posts: 71
Location: Stuttgart, Germany

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PostPosted: Mon Mar 28, 2011 3:26 am     Reply with quote
This looks much better => solved!
Thanks! Very Happy
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