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EEPROM 18F87K22 PROBLEM

 
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peppapig



Joined: 16 Sep 2016
Posts: 1

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EEPROM 18F87K22 PROBLEM
PostPosted: Fri Sep 16, 2016 6:13 am     Reply with quote
PIC: 18F87K22
COMPILER: PCWHD 4.114

Hello guys,

I have a weird situation with my internal eeprom.

My program always save the last data in all positions of eeprom, i believe that must be a problem with my compiler, take a look at my code.

My variable always return 104 in all position, like he always save the last data of write_eeprom in all position of my memory.
Code:
#include "configuracao.c"

unsigned int leitura;

void main()
{
   printf("Start... \n\r");

   while(true)
   {
      write_eeprom (1, 29);
      write_eeprom (40, 104);

      leitura = 0;
      leitura = read_eeprom(1);
      
      printf ("%u", leitura);
      
      delay_ms(2000);
   }
}


Code:
/*configuracao.c*/

#include    <18F87K22.h>
#fuses     HSH,NOPROTECT,INTRC_IO
#use       delay(clock=8M)
#use       rs232(baud=9600, xmit=pin_g1, rcv=pin_g2, parity=N, stop=1)
   
//PORT A
#use fixed_io(a_outputs = pin_a4,pin_a5,pin_a6,pin_a7)
//PORT B
#use fixed_io(b_outputs = pin_b1,pin_b2,pin_b3,pin_b4,pin_b5,pin_b6,pin_b7)
//PORT C
#use fixed_io(c_outputs = pin_c0,pin_c1,pin_c2,pin_c3,pin_c4,pin_c5,pin_c6,pin_c7)
//PORT D
#use fixed_io(d_outputs = pin_d0,pin_d1,pin_d2,pin_d3,pin_d4,pin_d5,pin_d6,pin_d7)
//PORT E
#use fixed_io(e_outputs = pin_e0,pin_e1,pin_e2,pin_e3,pin_e4,pin_e5,pin_e6,pin_e7)
//PORT F
#use fixed_io(f_outputs = pin_f1,pin_f2,pin_f3,pin_f4,pin_f5,pin_f6,pin_f7)
//PORT G
#use fixed_io(g_outputs = pin_g0,pin_g3,pin_g4)
//PORT H
#use fixed_io(h_outputs = pin_h0,pin_h1,pin_h2,pin_h3,pin_h4,pin_h5,pin_h6,pin_h7)
//PORT J
#use fixed_io(j_outputs = pin_j0,pin_j1,pin_j2,pin_j3,pin_j4,pin_j5,pin_j6,pin_j7)

#byte porta = 0x05
#byte portb = 0x06
#byte portc = 0x07
#byte portd = 0x08
#byte porte = 0x09
#byte portf = 0x10
#byte portg = 0x11
#byte porth = 0x12
#byte portj = 0x13
temtronic



Joined: 01 Jul 2010
Posts: 9101
Location: Greensville,Ontario

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PostPosted: Fri Sep 16, 2016 2:47 pm     Reply with quote
don't know about the eeprom but the I/O ports are not at 05h ...13h, ,according to the datasheet that are at 0f80h...0f85h according to table 6-2,page 101.

Jay
guy



Joined: 21 Oct 2005
Posts: 291

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PostPosted: Sat Sep 24, 2016 1:06 pm     Reply with quote
Quote:
My program always save the last data in all positions of eeprom

I doubt it. Most probably the read_eeprom is getting an old value from the register. Send us the .LST file or upgrade the compiler. Cool
Ttelmah



Joined: 11 Mar 2010
Posts: 19217

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PostPosted: Mon Sep 26, 2016 7:06 am     Reply with quote
There are lots of problems even with the code incomplete.

First the addresses for the registers have been copied from a PIC16, and are invalid for a PIC18. Duh.
Why these are being used at all (especially given all the fixed_io statements, which these will bypass), is questionable, but if they are needed, they need to be corrected. Temtronic has pointed this out.

Then the fuses are wrong. First, two oscillators being selected (INTRC, and HSH....), and some basic settings missing. It looks like the code has been 'cut and pasted' from something from a basic PIC16, with no attempt to handle the hardware differences of the PIC18, and with stuff set wrongly.....

Then we have the big one, that this is a very early compiler for this chip. The 87K22, was only released in 2010, and guess when 4.114 dates from....
The first CCS compiler with this chip was about 4.112, and generally many functions were often 'not right' for the first few releases when a chip came out in those days.
Compiled with 4.118, with some working fuses, the code runs fine.

Code:

#include <18F87K22.h>
#fuses NOPROTECT, INTRC_IO, SOSC_DIG, NOXINST, NOWDT, NOEXTADDRSFT, NOFCMEN
#fuses NOIESO
#use delay(clock=8m)
#use rs232(baud=9600, UART1, parity=N, stop=1)

void main()
{
   int8 leitura;
   printf("Start... \n\r");

   while(true)
   {
      write_eeprom (1, 29);
      write_eeprom (40, 104);

      leitura = 0;
      leitura = read_eeprom(1);
     
      printf ("%u\n", leitura);
     
      delay_ms(2000);
   }
}


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