Subj : Re: A really stupid Question - how to build a library
To   : borland.public.cpp.borlandcpp
From : D Kat
Date : Tue Oct 12 2004 06:42 pm

"Bob Gonder" <notbg@notmindspring.invalid> wrote in message 
news:6ob9m05r1ijn1ed5ojlu3uvov85ttf8qvm@4ax.com...
>D Kat wrote:
>
>>each time an end of buffer is reached.....  Then of course there are the
>>counters (ticks for each call to the interrupt) and other variables that 
>>are
>>needed by the main program.  I seem to be going around in circles on this.
>
> Forget for a minute what the Main program needs.....
> Put everything the Library code needs, in the Library.
> Then, think about what the Main program needs to know.
> Anything that the Main doesn't need to know, make static.
> Probably readlength[] and playndx;
> static int readlength[whatever];
> static int playndx;
>
> Everything the Main program needs to know, declare in a Header file as
> extern.
> extern int TIMERS;
> extern int counter[];
> extern int timer[];

When I attempt to do it this way the compiler error is that the size of the 
type is unknown or zero.....





>> int button,i;   //  button iterator
>> unsigned char PA_buttons,PC_buttons; // temp holding register for current
>
>> for (i=0;i<TIMERS;i++)
>
> Are there more than 2 timers?
> Is TIMERS a fixed value?
> If so, then unroll the loop for much better speed (important for ISRs)
>
>> if (counter[0] == file_length)PLAYFLAG=0;
>
> Program defensively, check >= instead of ==
>
>> if (PLAYFLAG==1)
>> {
>>   if (counter[1] == (readlength[playndx]-1))
>
> Program defensively, check >= instead of ==
>
>>   {//if at end of buffer point to next buffer
>>     playndx++;
>>     if(playndx==NUMBUF)playndx=0;//next buffer at 0 if beyond last buffer
>
> Program defensively, check >= instead of ==
>
>>     if(readlength[playndx]<2) PLAYFLAG=0;//if buffer empty - stop play
>>     else{ //else setup to play next buffer and read next buffer
>>      da_point = &wavebuffer[playndx][0]; //point to next buffer to play
>>      counter[1]=0;//counter for this buffer set to beginning
>>      READ = 1;
>>     }// read flag:  buffer is empty -> fill buffer
>>   }
>
> This loops the output if the buffer is empty?
>
>>   outpw(DA_0,*da_point);
>>   outpw(DA_1,*da_point++);
>> }
>

.