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comments in macro

 
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radi
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comments in macro
PostPosted: Thu Feb 26, 2004 3:59 am     Reply with quote
Do someone knows how may I put comments inside micro?

I try something like this:

#define display()\ //Macro for....
output_b(0b11111111);\ // Mask PORTB.
output_high(PIN_A5);\ // set "a" segment.
delay_cycles(80);\ //.......
PORTA=(PORTA&0b11111000)|temp0_interrupt; // Select current display.


When I clear the comments everything is allright, but when I have comments the problems come.
Ttelmah
Guest
Re: comments in macro
PostPosted: Thu Feb 26, 2004 5:31 am     Reply with quote
radi wrote:
Do someone knows how may I put comments inside micro?

I try something like this:

#define display()\ //Macro for....
output_b(0b11111111);\ // Mask PORTB.
output_high(PIN_A5);\ // set "a" segment.
delay_cycles(80);\ //.......
PORTA=(PORTA&0b11111000)|temp0_interrupt; // Select current display.


When I clear the comments everything is allright, but when I have comments the problems come.

You should put the comments before the '\'.
Do them like this:
Code:

#define display() /*Macro for...*/\
     output_b(0b11111111); /* Mask PORTB.*/\
     output_high(PIN_A5); /* set "a" segment.*/\
     delay_cycles(80); /*.......*/\
     PORTA=(PORTA&0b11111000)|temp0_interrupt   /* Select current display.*/


Note also that you don't really want the ';' at the end of the last line (since presumably 'display', will be typed as 'display();', and you will get an 'extra' ';', when the expression is expanded.

The problem is that the '\', means 'skip the significance of the following line feed', and the compiler does not 'remember' this to the end of the line if followed by a comment. Using '/* */', allows you to terminate the comment, and then use the '\'.

Best Wishes
RADI



Joined: 26 Feb 2004
Posts: 1

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RADI
PostPosted: Fri Feb 27, 2004 3:16 am     Reply with quote
Ttelman, thank you very much! Now everything is clear for me.

Best Wishes
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