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Function with IO ports as arguments

 
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Requan



Joined: 11 May 2008
Posts: 74

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Function with IO ports as arguments
PostPosted: Thu Jul 12, 2012 3:13 am     Reply with quote
Hi,
I would like to built two function with port as argument for write and read data in port, so e.g:
Code:

#include <18F46k20.h>
#fuses HS, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock=20M)

#define LedOK Pin_B1
#define LedNG Pin_B0

Led(int8 *Port)
{
   output_low(Port);
   delay_us(1000);
   output_high(Port);
   delay_us(1000);
   output_low(Port);
}
main()
{
   int8*pointLedOK = LedOK;
   Led(*pointLedOK);
   while(1)
}

I used pointer but i didn't work.
Where i made mistake?
Ttelmah



Joined: 11 Mar 2010
Posts: 19520

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PostPosted: Thu Jul 12, 2012 8:27 am     Reply with quote
A port pin number, is just a number, not a pointer. It is also an int16, not an int8.
So:
Code:

#include <18F46k20.h>
#fuses HS, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock=20M)

#define LedOK Pin_B1
#define LedNG Pin_B0

void Led(int16 pin_number) {
   output_low(pin_number);
   delay_us(1000);
   output_high(pin_number);
   delay_us(1000);
   output_low(pin_number);
}

void main(void) {
   int16 pointLedOK = LedOK;
   Led(pointLedOK);
   while(1) ;
}

Also, I doubt if you will see this. The led will only be on for 1mSec.....

Best Wishes
Requan



Joined: 11 May 2008
Posts: 74

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PostPosted: Fri Jul 13, 2012 7:22 am     Reply with quote
Thanks Ttelmah for help.
Quote:

Also, I doubt if you will see this. The led will only be on for 1mSec.....

Yes You right Embarassed
I made mistake instead ms I write us.
Best Regards,
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