Simulation of PIC C Code...

[koolguy]

HI,

I want to test code whether it will work or not in PIC like simulating the codes....
so, i am using MAP LAB for converting HEX file, i have listen of Proteus ISI but it is not free so can i test the code by any other mean(Software).

Thanks

 

[Ian Rogers]

Are you still using pic16f676? I was playing with this

Seems to work ok...

 

[koolguy]

Are you still using pic16f676?

No, PIC16F877A...

 

[koolguy]

I have programmed the PIC 16F877A with this code:
and PIC was connected as per schematic using 4Mhz the problem is that the LED was not blinking as the output from port B is zero all the time, why??

#include <htc.h>
__CONFIG(LVP_OFF & BOREN_OFF & PWRTE_ON & WDTE_OFF & FOSC_XT);


#define _XTAL_FREQ 4000000

void main (void)
{
TRISB=0b00000000;//all pins set as ouput
PORTB=0;
while (1)
 {//endless loop
  PORTB = !PORTB;
  __delay_ms(1000);
 }
}

hex code 
:060000000A128A11DC2F38
:100FB80083010A128A11E02F831603138601831214
:100FC80003138601E72F83120313860800300319E1
:100FD800013086000630F2001330F100B130F00025
:100FE800F00BF42FF10BF42FF20BF42FFB2FE72F5C
:080FF800E72F0A128A110028FC
:02400E0031FF80
:00000001FF

 

[Ian Rogers]

There is nothing wrong with the code.... I cant tell from your photo if the chip is wired correctly... The wiring is available on Nigel's site... Hardware section...

 

[koolguy]

There is nothing wrong with the code

Can u pls make hex file and compare both i have checked the connection but nothing was Wrong in it..

 

[Ian Rogers]

I just compiled the same code... MPLAB 8.83

:060000000A128A11DC2F38
:100FB80083010A128A11E02F831603138601831214
:100FC80003138601E72F83120313860800300319E1
:100FD800013086000630F2001330F100B130F00025
:100FE800F00BF42FF10BF42FF20BF42FFB2FE72F5C
:080FF800E72F0A128A110028FC
:02400E0031FF80
:00000001FF

No problem here.....

 

[koolguy]

That's cool...
so, what will be the problem should i open the outer cover of wire and solder on PCB??
and someone suggest to use PORTB = ~PORTB

 

[Ian Rogers]

The code works....

Have to tried testing the LED by shorting the resistor to ground ?

 

[koolguy]

The code works....

where??

Have to tried testing the LED by shorting the resistor to ground ?

i have used multimeter also but nothing was there except zero...

 

[Ian Rogers]

All the tutorials that I produced were tested to be working... Both simulation and on Nigel's hardware ( otherwise there would be no point posting it )

So I know the code works...

Have you got a scope? to check your oscillator is running?

 

[koolguy]

Have you got a scope?

I don't have but but i have seen voltage across it was ~.64V

 

[Ian Rogers]

Ok never mind...... I have seen your problem.... The code is flashing pin 33 only.... You are correct sir!!! Change line PORTB = ~PORTB...

Sorry... I was testing pin 33 not pin 40..

 

[koolguy]

OK, after changing code the LED is blinking...
thanks.

 

[koolguy]

Hi,

I am working further on programming i have modified this code and compiled successfully...
but i want to know will it work any procedure to check??

#include <htc.h>
__CONFIG(LVP_OFF & BOREN_OFF & PWRTE_ON & WDTE_OFF & FOSC_XT);


#define _XTAL_FREQ 4000000

void main (void)
{
TRISB=0b00000000;//all pins set as ouput
PORTB=0;
while (1)
 {//endless loop
  PORTB = 0x1;
  __delay_ms(1000);
PORTB = 0x2;
  __delay_ms(1000);
PORTB = 0x4;
  __delay_ms(1000);
PORTB = 0x8;
  __delay_ms(1000);
PORTB = 0xff;
  __delay_ms(1000);


 }
}

 

[Ian Rogers]

Ritesh.... Do this..

#include <htc.h>
__CONFIG(LVP_OFF & BOREN_OFF & PWRTE_ON & WDTE_OFF & FOSC_XT);
 
 
#define _XTAL_FREQ 4000000
 
void main (void)
	{
	TRISB=0b00000000;//all pins set as ouput
	PORTB=0;
	while (1)
		{//endless loop
		PORTB = 0x1;
		NOP(); //__delay_ms(1000);
		PORTB = 0x2;
		NOP(); //__delay_ms(1000);
		PORTB = 0x4;
		NOP(); //__delay_ms(1000);
		PORTB = 0x8;
		NOP(); //__delay_ms(1000);
		PORTB = 0xff;
		NOP(); //__delay_ms(1000);
		}
	}

And run it in the MPLAB sim... The nop's will speed things up a bit.

 

[koolguy]

NOP(); //__delay_ms(1000);

NOP will also give delay of 1Sec??
and

And run it in the MPLAB sim.

how??

 

[Ian Rogers]

When you software sim... The code takes an age to delay(1000)... so we replace the delay with a nop.. 1 instruction just for sim purposes.

Have you ever simulated the code in MPLAB? Goto the Debugger menu.. Select tool.. option 5 ... MPLAB SIM ..

 

[koolguy]

Have you ever simulated the code in MPLAB? Goto the Debugger menu.. Select tool.. option 5 ... MPLAB SIM ..

Not so much aware of it..and only arrow is following can't we get more info from it??

 

[Ian Rogers]

and only arrow is following

I don't understand?