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Interrupt and return data

 
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Jude
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Interrupt and return data
PostPosted: Sat Feb 07, 2004 9:57 am     Reply with quote
Sorry, i speak english very little.

How work PortB pin0 interrupt (INT) (pic 16f877a)?
I write code in CCS pic c.

This is ok -> temp1=program(); Program return(data);
Can i return two data ( "return(data1, data2)" ).

Thanks.
ttelmah
Guest
Re: Interrup and return data
PostPosted: Sat Feb 07, 2004 11:30 am     Reply with quote
Jude wrote:
Sorry, i speak englis very litte.

How work bortb pin0 interrup (INT) (pic 16f877a)?
I write code in css pic c.

This is ok -> temp1=program(); Program return(data);
Can i return two data ( "return(data1, data2)" ).

Thanks.

The interrupt functions, do not return data.
If you need to return data from an interrupt, use a global variable. In any other function, only one data return is allowed, but there is nothing to stop this being an array, or a structure.

Best Wishes
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sat Feb 07, 2004 1:11 pm     Reply with quote
Quote:
How work Portb pin0 interrupt (INT) (pic 16f877a)?

The following link contains a demo program for the #INT_EXT interrupt.
http://www.ccsinfo.com/forum/viewtopic.php?t=8504
Jude
Guest
PostPosted: Sat Feb 07, 2004 1:17 pm     Reply with quote
Ou yeah.

I write two questions (but very bad english).

1. How work INT (portb, pin 0) interrup (CSS C).

2. How i can retur two variable.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sun Feb 08, 2004 3:49 pm     Reply with quote
Quote:
2. How i can return two variables.

I guess you want a demo program that shows how
to return more than one variable in a structure
(as suggested by R.J. in his reply).
Here is a demo that shows how to return 3 variables
in a structure.

Code:
#include <16F877.h>
#fuses XT, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock = 4000000)
#use rs232(baud = 9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)   

// Create a structure data type that will hold
// the three return values.
typedef struct
{
char a;
char b;
char c;
}t_ret3;

// FUNCTION PROTOTYPES
t_ret3 my_func(void);

//========================================
main()
{
t_ret3 t_result;

t_result = my_func();

printf("Return values are: %x, %x, %x \n\r", t_result.a, t_result.b, t_result.c);

while(1);
}

//==========================================
// Create a small function, as a test, that will just
// set three values and return them as a structure.

t_ret3 my_func(void)
{
t_ret3 retvals;

retvals.a = 0x55;
retvals.b = 0xAA;
retvals.c = 0x11;

return(retvals);
}
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