Subject:
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tweaking around dlcd_show( )
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Newsgroups:
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lugnet.robotics.rcx.legos
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Date:
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Sat, 25 Aug 2001 01:05:44 GMT
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Reply-To:
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laleks@IHATESPAMfree.fr
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Viewed:
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1645 times
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Hi all legOS users,
need help about dlcd_* utilities
I'd like to display on the lcd a sequence of digits:
something like :
dlcd_show (LCD_4_BOTL);
lcd_refresh();
msleep(250);
lcd_clear();
dlcd_show (LCD_4_TOPL);
lcd_refresh();
msleep(250);
lcd_clear();
dlcd_show (LCD_4_TOP);
...
But of course this is not a good idea to hardcode a long sequence.
So I tried to make a pattern of segments stored in an array, and access to
the good one with an index value in a for { } loop.
int progressPattern[PATTERN_ITEMS_NB]={
{LCD_4_BOTL} ,
{LCD_4_TOPL} ,
{LCD_4_TOP }
};
and later
for (...){
...
lcd_clear();
dlcd_show(progressPattern[ i ] );
lcd_refresh();
msleep(250);
...
}
and I obtain the following compilation errors concerning dlcd_show( );
macro `BIT_OF' used with just one arg
macro `BYTE_OF' used with just one arg
I tried lots of braces combination , a declaration of a bidimensional array
too, but in vain.
Since I'm not an expert in C and macros, I certainly made something wrong
when filling this array with defines, and maybe it is not the right way to
proceed.
Thanks a lot for advance.
--
Alexandre BEC
laleks_at_free_dot_fr
--
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Message has 2 Replies:
 | | Re: tweaking around dlcd_show( )
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| Hi, I haven't used LegOs (yet), but looking at the dlcd_show function, it expects 2 parameters. The defines are also for 2 parameters, so you would need to define and use it like this: int progressPattern[PATT...S_NB][2]={ {LCD_4_BOTL} , (...) (23 years ago, 25-Aug-01, to lugnet.robotics.rcx.legos)
| | | Re: tweaking around dlcd_show( )
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| (...) The macros LCD_?_* expand to two integers, separated by a comma; dlc_show() is a macro that expects one argument but uses it as an argument to macros expecting two arguments. I don't know exactly how this works, but it's to do with the order (...) (23 years ago, 3-Sep-01, to lugnet.robotics.rcx.legos)
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