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RAM problem

 
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leto



Joined: 02 Aug 2005
Posts: 14

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RAM problem
PostPosted: Mon Aug 08, 2005 2:45 pm     Reply with quote
Hi,

My program has a "not enough RAM for all variables". But just when I put a comment "//" in char k definition (1st of main) instead of when I get out this comment. I guest when i put a comment im releasing memory but it has an opposite behavior.
Could anyone help me.

Thanks

Code:

void main() {
//   char k;

   setup_adc_ports(NO_ANALOGS);
   setup_adc(ADC_OFF);
   setup_psp(PSP_DISABLED);

   SET_TRIS_A( 0x00 );           // All A are outputs
   SET_TRIS_B( 0xFF );           // B7,B6,B5,B4,B4,B2,B1 are inputs


   rtc_init();                   
   set_clock();         
   init_ext_eeprom();


   port_b=0;
   seconds=0;
   minutes=0;

   setup_counters(RTCC_INTERNAL, RTCC_DIV_256 );
   set_rtcc(236);     
   ext_int_edge(L_TO_H);   
   enable_interrupts(INT_RB); 
   enable_interrupts(global);
   port_b_pullups(FALSE);   
   glcd_init(ON);
   while (TRUE);
}


Page ROM  %  RAM  Functions:
---- --- --- ---  ----------
0      19   0   1  @delay_ms1
1    121   2   1  glcd_init
1    150   3   9  glcd_pixel
1    106   2   4  glcd_fillScreen
1      39   1   2  @MUL88
0      50   1   2  glcd_writeByte
1      60   1   2  glcd_readByte
0    235   4   0  @const71
0    235   4   0  @const74
0      42   1   0  @const77
0    262   5   0  @const80
0    227   4   0  @const83
1      23   0   5  @MUL1616
1    219   4  20  glcd_text57
1    404   7  58  glcd_myText
0      18   0   1  @I2C_WRITEU_1_59_60_20000000
1      17   0   1  @I2C_READU_1_59_60_20000000
0      13   0   0  init_ext_eeprom
1      49   1   5  read_ext_eeprom
0      14   0   0  @const10575
0      23   0   3  @DIV88
1    129   2   6  @PRINTF_D_9600_62_63
0      94   2   0  @const220
0      28   1   0  @const223
0      42   1   0  @const226
1      10   0   1  @SPRINTF
1    117   2   6  @PRINTF_D_458
1      94   2   8  @PRINTF_LU_458
2   1148  21   4  MainMenu
0      26   0   0  @const10818
0      25   0   0  @const10822
1      63   1   4  Menu2
1    104   2   4  MenuSelect
0        6   0   0  @const10873
0      29   1   0  @const10899
0      26   0   0  @const10907
1      35   1   8  i2c_eeprom_ReadString
0      30   1   2  write_ds1302_byte
0      19   0   2  write_ds1302
0      90   2   2  rtc_init
0      23   0   3  bin_to_bcd
0    101   2   7  set_clock
0      14   0   0  crono
0      46   1   0  tecla
0    127   2   4  external
0      13   0   0  @const11069
0      22   0   0  TiempoSector
2    481   9  22  welcome
0      23   0   0  @const11102
0      20   0   0  @const11106
0      14   0   0  @const11111
0      11   0   0  @const11126
0      13   0   0  @const11134
1    110   2   1  main
1      42   1   0  KeyPress
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue Aug 09, 2005 12:48 pm     Reply with quote
I think no one has answered your post because we think it's
probably the same answer that's been posted 1000 times already.

But anyway, here's the likely answer:
The compiler doesn't normally use all the RAM banks with the PCM
compiler. You have to tell it to use RAM at addresses above 0xFF.
This is done by adding the #device *=16 statement, as shown below.
It should be placed in the next line after your main #include statement.
Example:
Code:
#include <16F877.h>
#device *=16
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