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Always false warning

 
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Scotty
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Always false warning
PostPosted: Mon Jul 19, 2004 8:47 am     Reply with quote
PCWH 3.206

I have something curious happening in my program and was wondering if anyone can explain it.

In line 17 below " if (!aff_power) init_done=0;" gives me a warning that it will always be false but the line works as it should.

I was wondering if anyone knows why i am getting the warning?

******
Code:

#define  AFF_Power   PIN_A1  //pin 18 - pin RA1

int init_done;

<snip>

        restart_wdt();
        //
        // read the switch state to get start signal status
        start_signal = input(pin_A0);  // get start signal input

        if (input(MP_BOL)==unblocked){
            Jam_flag=0;
            jam_timer=0;
        }

        if (!aff_power)
                        init_done=0;

 // Is the MP BOL blocked?
        if ((input(MP_BOL)== blocked) && (idle == 0))
           {
            if (jam_flag==0) // is this the first time seen?
            {
                jam_stop=0;
                jam_flag = 1;  // if so, start timer and set flag
                Jam_Timer = JAM_TIME;
            }
rwyoung



Joined: 12 Nov 2003
Posts: 563
Location: Lawrence, KS USA

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PostPosted: Mon Jul 19, 2004 8:53 am     Reply with quote
I'm supprised it works at all.

The PIN_Ax assignments (as I understand them) are not the port addresses themselves. You are doing the same basic operation as

if (!22) init_done=0;

(substitue the value of PIN_A0 from your header file for 22).

You should either use the input_pin() function or use the #byte and #bit feature to map your pin to a variable.

FYI, if you use the input_pin() function then #use standard_io() will work as well as #use fast_io() and #use fixed_io()

However if you use the #byte and #bit you must set the pin direction by programming the appropriate TRIS register.
_________________
Rob Young
The Screw-Up Fairy may just visit you but he has crashed on my couch for the last month!
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