Re: [avr-gcc-list] Initilizing complex const arrays : syntax ?

[Jesper Hansen]

Yes, but that was not the original question.

On a mega128, you can have quite a lot of these structs without a problem.
I'll leave it up to the OP to ask again, if that is a problem.
No need to complexify the answer unnecessarily.
Otherwise we could just reply to all questions with a full AVR/C tutorial.

/Jesper

Anton Erasmus wrote:
> On 18 Sep 2005 at 9:36, Jesper Hansen wrote:
>
>
> > It's just as before; one element at a time.
> > In this case, your element is the first structure :
> >
> > struct param param_list[] = {
> > { "Engine Speed", "RPM", "%4d" },
> > { "Coolant Temp", "°C", "%3.1f" },
> > { "Turbo Pressure", "Bar", "%2.1" },
> > { e.t.c. },
> > { NULL, NULL, NULL }
> > };
> >
> > Note that as another example, I left out the length of the param_list,
> > you can detect the end by checking for the NULL pointers.
>
>
> The problem with this using avr-gcc, is that the data is stored in RAM, and not 
> in
> FLASH. This makes the use of these sorts of structures much more problematical.
> In order to access any data in flash using avr-gcc, one needs in essence to get a 
> pointer that points to the specific data one wants to read. 
>
> Regards
>   Anton Erasmus
>
>
> > Vincent Trouilliez wrote:
> >
> > > Hi,
> > >
> > >
> > > I know how to initialize arrays with one dimension, like this :
> > >
> > > const type variable[3] = {value1, value2, value3 };
> > >
> > >
> > > but now I am having to initialize an array of structures, and I am
> > > getting lost :-/ Here is my declaration :
> > >
> > >
> > > ui.h
> > > ----
> > > //data type for one engine parameter
> > > struct param {
> > >                 char    desc[11];       //parameter name ("Engine Speed", 
> > > "Coolant
> > > Temp",...)                 char    unit[4];        //unit to be used ('%', "RPM", 
> > > "°C",
> > > "Bar" ...)            char    format[6];      //printf format string: how to 
> > > format
> > > the number on the LCD
> > > };
> > >
> > >
> > > //table containing the definition for all engine parameters
> > > extern const struct param param_list[30];
> > >
> > >
> > > What's the syntax to initialize my "param" array above ?!
> > >
> > >
> > > Thanks in advance... :-)
> > >
> > >
> > >
> > > Regards,
> > >
> > >
> > > --
> > > Vince
> > >
> > >
> > >
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> >
> >
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