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pilar
Joined: 30 Jan 2008
Posts: 197
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| Preload the PIC18F452 EEPROM |
 Posted: Fri Oct 09, 2009 8:40 am |
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I want to use the #ROM preprocessor directive to preload the PIC18F452 EEPROM with values at the time of programming the chip but I have a doubt , what is the start address of the eeprom.
| Code: | #define putLong(value) {value,(value>>8),(value>>16),(value>>24)}
#rom 0x0??? = putLong(0x12345678)
#rom 0x0??? = putLong(0x9ABCDE)
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treitmey
Joined: 23 Jan 2004
Posts: 1094
Location: Appleton,WI USA
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| Posted: Fri Oct 09, 2009 8:56 am |
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Yes, its a little confusing.
First location of data eeprom of 18F452
if doing a #rom use 0xf00000
but latter if using a read eeprom use address 0.
In general you have to refer to spec sheet.
From the PIC18 Programming Specification, Chapter 5.6
Quote:
When embedding data EEPROM information in the HEX file, it should start at address F00000h.
http://www.ccsinfo.com/forum/viewtopic.php?t=32480&highlight=rom+data+eeprom+18f452
This won't compile. This just shows how I use it.
| Code: |
#include <18F452.h>
#fuses hs,wdt32,noprotect,nolvp,put
#use delay(clock=18432000,RESTART_WDT)
#use rs232(baud=19200,xmit=PIN_D7,invert,stream=DEBUG)
#case
#zero_ram
#build(reset=0x000:0x0007)
#define HARD_MAJOR (int8) 0
#define HARD_MINOR (int8) 0
#define FIRM_MAJOR (int8) 'K'
#define FIRM_MINOR (int8) 80
#define PROD_ID (int8) 3
#rom int8 0xf00000={HARD_MAJOR,HARD_MINOR,FIRM_MAJOR,FIRM_MINOR,PROD_ID}
//========================= Globals =================================//
struct def_kpd
{
int8 hard_major;
int8 hard_minor;
int8 firm_major;
int8 firm_minor;
int8 product_id;
}kpd_info;
//========================= Prototypes ==============================//
void init(void);
//========================= Main ====================================//
void main(void)
{
init();
while(1)
{
}
}
//========================= Functions ==============================//
//=== init ===// setup the initial settings
void init(void)
{
readParamsEEProm();
debug("H=%u.%02u ",kpd_info.hard_major,kpd_info.hard_minor);
debug("F=%C_%02u.c\n\r",kpd_info.firm_major,kpd_info.firm_minor);
}
//=== readParamsEEProm ===//
void readParamsEEProm(void)
{
//int8 addr;
int16 addr;
char *pntStruct;
pntStruct=&kpd_info;
for(addr=0;addr<sizeof(kpd_info);addr++,pntStruct++)
{
*pntStruct=read_eeprom(addr);
}
}
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