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pic18f not entering code

 
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roman1982
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pic18f not entering code
PostPosted: Mon Dec 14, 2009 10:40 pm     Reply with quote
Hi
My program is not entering the "FUNCTIONS" code (18F252 & 18F4520). It happened in the last week when I try to begin with 18F4550.
The programs written before (18F252 & 18F4520), entering the "FUNCTIONS" code. Entering interrupts. I suppose I am missing something.
I am using the CCS Wizard for the programs, MPLAB simulator and a board. The old programs all works in MPLAB and the board. The new, don't.
I have reinstalled the CCS compiler (3.249) and the plugins. No change.
Have restored the system (Windows) to 3 weeks ago.
The new code below:
Code:

#include "252.h"
//#include "252VAR.h"
//#include "252FUNCTIONS.h"

int timer20ms=0;
short ledflag=1;

void FUNCTIONS_isr(void)
{
   restart_wdt();
   if (timer20ms==25)
   {
      timer20ms=0;
      if (ledflag==0)
      {
         output_low(PIN_A4);
         ledflag=1;
      }
      else
      {
         output_high(PIN_A4);
         ledflag=0;
      }
   }
//aditonal functions
}      

#int_TIMER0
void TIMER0_isr(void)
{
   restart_wdt();
   set_timer0(45536);//to interrupt after 20ms
   timer20ms++;
}

#int_RDA
void RDA_isr(void)
{
//serial rx
}

#int_TBE
void TBE_isr(void)
{
//serial tx
}

void main(void)
{
   setup_adc_ports(NO_ANALOGS);
   setup_adc(ADC_OFF);
   setup_spi(FALSE);
   setup_wdt(WDT_ON);
   setup_timer_0(RTCC_INTERNAL|RTCC_DIV_8);
   setup_timer_1(T1_DISABLED);
   setup_timer_2(T2_DISABLED,0,1);
   setup_timer_3(T3_DISABLED|T3_DIV_BY_1);
   enable_interrupts(INT_TIMER0);
   enable_interrupts(INT_RDA);
   enable_interrupts(INT_TBE);
   setup_oscillator(False);
   enable_interrupts(GLOBAL);
   while(1)
   {
         restart_wdt();
         enable_interrupts(GLOBAL);
      FUNCTIONS_isr ();
   }
}


Code:

#include <18F252.h>
#device adc=8
#FUSES WDT8                     //Watch Dog Timer uses 1:8 Postscale
#FUSES H4                       //High speed osc with HW enabled 4X PLL
#FUSES NOPROTECT                //Code not protected from reading
#FUSES NOOSCSEN                 //Oscillator switching is disabled, main oscillator is source
#FUSES BROWNOUT                 //Reset when brownout detected
#FUSES BORV42                   //Brownout reset at 4.2V
#FUSES PUT                      //Power Up Timer
#FUSES STVREN                   //Stack full/underflow will cause reset
#FUSES NODEBUG                  //No Debug mode for ICD
#FUSES NOLVP                    //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O
#FUSES NOWRT                    //Program memory not write protected
#FUSES NOWRTD                   //Data EEPROM not write protected
#FUSES NOWRTB                   //Boot block not write protected
#FUSES NOWRTC                   //configuration not registers write protected
#FUSES NOCPD                    //No EE protection
#FUSES NOCPB                    //No Boot Block code protection
#FUSES NOEBTR                   //Memory not protected from table reads
#FUSES NOEBTRB                  //Boot block not protected from table reads

#use delay(clock=32000000,RESTART_WDT)
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8,restart_wdt)


Please help
Roman
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Mon Dec 14, 2009 10:52 pm     Reply with quote
Quote:

#int_RDA
void RDA_isr(void)
{
//serial rx
}

#int_TBE
void TBE_isr(void)
{
//serial tx
}

enable_interrupts(INT_RDA);
enable_interrupts(INT_TBE);

Comment out these last two lines. You don't have any code in the
#int_rda isr to get the character. Therefore, the PIC will constantly be
executing the #int_rda isr. Also, the UART transmitter will always be
empty in your program, and therefore you will get continuous int_tbe
interrupts. Don't enable interrupts if you don't have code to handle
the clearing of the interrupt (where required by the peripheral module).



Quote:
setup_spi(FALSE);

Delete this line. You don't need it. The SPI module is already disabled
on power-up anyway.

Quote:

#FUSES WDT8

setup_wdt(WDT_ON);

Don't enable the Watchdog timer in a test program that is testing
something else, such as the FUNCTIONS_isr routine. The Watchdog
will just add confusion to the testing. Only test one problem at a time.


Quote:
output_high(PIN_A4);

This pin has an open-drain driver. To make it work with an LED, you
would need to connect the Cathode of the LED to the pin. Then connect
the anode to a 470 ohm series resistor, and then connect the other side
of the resistor to +5v.
roman1982
Guest
not entering code
PostPosted: Tue Dec 15, 2009 2:39 am     Reply with quote
PCM programmer

Thank you for the advises
It works perfect after correcting according to your remarks

Roman
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