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Write EEPROM

 
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art



Joined: 21 May 2015
Posts: 181

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Write EEPROM
PostPosted: Sun May 28, 2017 11:40 pm     Reply with quote
Hi

I would like to write an eeprom starting from address 00 to 0B, but
I found out, only address 00 until 03 were written into the eeprom.
How to make it write all this 12 addresses ?

Here is my code.
Code:

#include <18F4550.h>
#DEVICE ADC=10
#fuses HSPLL,NOWDT,PROTECT,NOLVP,NODEBUG,USBDIV,PLL5,CPUDIV1,VREGEN       
#use delay(clock=48000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7,ERRORS)

#include <string.h>
#include <input.c>
#include <stdio.h>
#include <stdlib.h>
#include <usb_cdc.h>
#include "24256.c"


void read_string_eeprom(char *buffer, int16 start_addr, int8 no_chars)
{
   int8 count;
   for (count=0;count<no_chars;count++)
      {
        buffer[count]=read_ext_eeprom(start_addr++);
      }
      buffer[count]='\0';
} 


 
void main()
   {
      char c;
      int8 i  ;         
      unsigned char d;     
      unsigned char key;       
      int8 buffer[100];
      char m="A";     
      char n="Z";
      char o="S";
      char p="K";   
   
                                         

   usb_init_cs();
   


   while (TRUE)
         {
         usb_task();


            if (usb_cdc_kbhit())
               {
                 c=usb_cdc_getc();
                 if (c=='\n') {putc('\r'); putc('\n');}
                 if (c=='\r') {putc('\r'); putc('\n');}

                                       

                 while(true)
                 
                     {
                  ART:

                  d = usb_cdc_getc();


                         if(d=='W')   // push A
                             {
                                while (key!=32) // push SPACE BAR to stop
                                   {

                                 if(usb_cdc_kbhit())
                                   {key=usb_cdc_getc();}

                                       
                                       {
                                         
                                             init_ext_eeprom();
                                                                                   
                                              printf(usb_cdc_putc, "\n");
                                             
                                             for(i = 0; i<3; i=i+4)
                                                {
                                                write_ext_eeprom(i, m);
                                                write_ext_eeprom(i+1, n);
                                                write_ext_eeprom(i+2, o);
                                                write_ext_eeprom(i+3,p);           
                                                }
                                                                                                                                                       
                                               
                                             for(i = 0; i < 12; i=i+4 )   
                                               {
                                                read_string_eeprom(buffer, i, 4);
                                                printf(usb_cdc_putc,buffer);
                                                printf(usb_cdc_putc,"\r");   
                                               }                                       
                                     
                                       }         

                                   } key=0; // to initialize 'key' not as SPACE BAR
                             }

                     }
               }       
         }             
}                     

alan



Joined: 12 Nov 2012
Posts: 357
Location: South Africa

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PostPosted: Mon May 29, 2017 12:21 am     Reply with quote
When do you think this will exit the for loop:
Code:
for(i = 0; i<3; i=i+4)

Try
Code:
for(i = 0; i<12; i=i+4)


Regards
art



Joined: 21 May 2015
Posts: 181

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PostPosted: Mon May 29, 2017 12:52 am     Reply with quote
Hi alan,
Thanks it work!

Last edited by art on Mon May 29, 2017 1:00 am; edited 1 time in total
alan



Joined: 12 Nov 2012
Posts: 357
Location: South Africa

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PostPosted: Mon May 29, 2017 12:55 am     Reply with quote
You really think so?

for starts with i=0;
next round i=0+4 thus i= 4. Is this less than 3 or not?
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