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Character String - Out of RAM

 
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michaelb



Joined: 28 Nov 2005
Posts: 17

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Character String - Out of RAM
PostPosted: Mon Nov 28, 2005 11:46 am     Reply with quote
Hi,

I'm trying to store 82 characters in a string, from an RS232 input. When defining my string I get up to a length of 77 chars with 54% RAM usage, but when I try 78 chars I'm told 'Not enough RAM for all variables'. Any ideas? The code below is work in progress and isn't intended to do anyhting yet, I just want to buffer this data first.

Code:

#if defined(__PCM__)
#include <16F877.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=20000000)
#use rs232(baud=4800, xmit=PIN_C6, rcv=PIN_C7)
#endif

#include <lcd.c>

#define  esc            0x1B

void cls();

char letter[1];
char string[78];

#int_RDA
RDA_isr()
{
   letter[0] = getc();
   putc(letter[0]);
   lcd_putc(letter[0]);
}


void main()
{

   setup_adc_ports(NO_ANALOGS);
   setup_adc(ADC_OFF);
   setup_psp(PSP_DISABLED);
   setup_spi(FALSE);
   setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
   setup_timer_1(T1_DISABLED);
   setup_timer_2(T2_DISABLED,0,1);
   lcd_init();

   delay_ms(6);
   cls();
   lcd_putc("OK - 3");
   printf("Ready\n\r");
   delay_ms(1000);
   cls();
   printf("Listening\n\r");

   enable_interrupts(INT_RDA);
   enable_interrupts(GLOBAL);

   while(TRUE)
   {

   }
}

void cls(void)
{
   printf("%c[2J",esc);
}

i want to be able to add letter[0] to a free element in string[82] ideally. I'd appreciate any help with this.

Thanks,

Michael
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Mon Nov 28, 2005 11:49 am     Reply with quote
http://www.ccsinfo.com/forum/viewtopic.php?t=23932
michaelb



Joined: 28 Nov 2005
Posts: 17

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PostPosted: Mon Nov 28, 2005 11:55 am     Reply with quote
oops, sorry. Missed that. Thanks very much for your help,

Michael
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