Pic16f84a Simulation Failure

[Jorge 0]

 

Bug description:

Simulation of set_bit (porta,4) wont work.

porta has 5 bits.

this problem is 100% reproduceable & happens every time.

 

#include <system.h>

 

void main()

{

trisa = 0;

porta = 0;

 

porta = 16;

set_bit(porta,4);

}

 

 

 

IDE version: 6.6

Compiler: BoostC

Compiler version: the one in this package installer

Target device: PIC16F84A

OS: WINDOWS xp PRO SP2

 

Comments:

I just can't set this bit (on simulation mode).

 

Regards,

Jorge

[emte 0]

This does not work for many devices,

you need to check the list of supported devices

(i did not for this one) for the existing plugins used

in the simulator.

 

i commonly run accross this problem so much that

i stopped using the simulator and use a scope or

just wire up an LED to the pin.

[Dave 0]

 

Bug description:

Simulation of set_bit (porta,4) wont work.

porta has 5 bits.

this problem is 100% reproduceable & happens every time.

...

Comments:

I just can't set this bit (on simulation mode).

This behavour is actually correct.

PIN RA4 is of open drain type. This means it can only sink current.

The led block requires a current source to illuminate the LEDs.

What you really need is an LED block that will operate with current sinking, which we don't have

 

So RA4 simulation is correct, connect hardware in exactly the same way and you get exactly the same result!

 

Regards

Dave