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PIC18F4520 problem

 
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sven_1669



Joined: 28 Mar 2006
Posts: 5

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PIC18F4520 problem
PostPosted: Tue Mar 28, 2006 4:24 pm     Reply with quote
I am building an mp3 player using the STA013 decoder chip. It requires you to send 2007 address-data pairs to configure it. I am using the PIC18F4520, and trying to send these pairs using an array. I am getting the "not enough RAM" error. Is there any other way to send the data without using an array? Any ideas would be helpful. [/b]
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue Mar 28, 2006 4:49 pm     Reply with quote
Store the array in ROM instead of RAM. Tell the compiler to do this
by using the "const" qualifier in your array declaration. See the
example below:
Code:

#include <18F452.h>
#fuses XT,NOWDT,PUT,BROWNOUT,NOPROTECT,NOLVP
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)

int8 const STA013_UpdateData[] =
{
0x3a, 0x01, 0x2a, 0x04, 0x28, 0x00, 0x29, 0x00, 0x20, 0x00,
0x21, 0x00, 0x22, 0x00, 0x23, 0x00, 0x24, 0x00, 0x25, 0x00,
0x26, 0x00, 0x27, 0x00, 0x28, 0x01, 0x28, 0x02, 0x21, 0x8f,
0x28, 0x03, 0x21, 0x00, 0x28, 0x04, 0x28, 0x05, 0x28, 0x06,
0x28, 0x07, 0x28, 0x08, 0x28, 0x09, 0x28, 0x0a, 0x28, 0x0b
// etc.
};

//=================================
void main()
{
int16 i;    // Use 16-bit index
int8 value;

// Display the first ten bytes of the array.
for(i = 0; i < 10; i++)
   {
    value = STA013_UpdateData[i];
    printf("%x, ", value);
  }

while(1);
}
Guest
PostPosted: Tue Mar 28, 2006 8:15 pm     Reply with quote
thanks, works like a charm!!!
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