Use Data EEprom In 18F452?

[kuosda]

I'm using version 3.084 PCH Compiler .
The code dosen't work in 18f452 with write_eeprom() .

Data EEprom Write:
AdLp = 0;
while(AdLp < 4)
{
write_eeprom(AdLp,AdLp);
delay_ms(5);
AdLp++;
}
Data EEprom Read:
AdLp = 0;
while(AdLp < 4)
{
eedata_c = read_eeprom(AdLp);
printf("\r\n\%2d",eedata_c);
delay_ms(5);
AdLp++;
}
___________________________
This message was ported from CCS's old forum
Original Post ID: 3812

[gelly]

the same problem here !
The code that PCH compiles in 18f452 with ;

-write_eeprom()
-read_eeprom()*
-write_program_eeprom()
-read_program_eeprom

does not work !

*sometimes reads sometimes not ?!? can't get a grip onn it.


spent time checking my programmer, but programmer
works fine.

filling data eeprom with pch works well
with command #rom 0x....... = {data,data,data....}

ps: this all with compiler v3.078 till 3.084

___________________________
This message was ported from CCS's old forum
Original Post ID: 3820

[Mark]

<font face="Courier New" size=-1>Check your listing file. You will notice that there is no code listed for the write or read. I would suggest that you write your own routines and use as little of the built in functions as possible. Here are some routines to help you out


#define EEADR 0xFA9
#define EEDATA 0xFA8
#define EECON1 0xFA6
#define RD 0
#define WR 1
#define WREN 2
#define WRERR 3
#define FREE 4
#define CFGS 6
#define EEPGD 7

#define EECON2 0xFA7
#define PIR2 0xFA1
#define EEIF 4

void writeeeprom(int address, int data)
{

bit_clear(*PIR2, EEIF); // Make sure that the int flag is cleared
(int)*EEADR = address; // Load our address
(int)*EEDATA = data; // Load our data
bit_clear(*EECON1, EEPGD); // Point to data memory
bit_set(*EECON1, WREN); // Enable writes


// Microchip recommends disabling ints here
disable_interrupts(GLOBAL);
(int)*EECON2 = 0x55; // Write 0x55
(int)*EECON2 = 0xAA; // Write 0xAA
bit_set(*EECON1, WR); // Set WR to begin write

// Ok to turn back on ints
enable_interrupts(GLOBAL);

// Wait for the write to complete
while (!bit_test(*PIR2, EEIF));
bit_clear(*EECON1, WREN); // disable writes

}

int readeeprom(int address)
{
(int)*EEADR = address; // Load our address
bit_clear(*EECON1, EEPGD); // Point to data memory
bit_set(*EECON1, RD); // EEPROM Read
return(*EEDATA); // Return with our value
}

Notice that the Global ints will be enabled after you call the writeeeprom routine. If this is a problem, then change the routine to check the status first (INTCON register, bit 7) and only set this bit if it was set before.

Mark

:=I'm using version 3.084 PCH Compiler .
:=The code dosen't work in 18f452 with write_eeprom() .
:=
:=Data EEprom Write:
:= AdLp = 0;
:= while(AdLp < 4)
:= {
:= write_eeprom(AdLp,AdLp);
:= delay_ms(5);
:= AdLp++;
:= }
:=Data EEprom Read:
:= AdLp = 0;
:= while(AdLp < 4)
:= {
:= eedata_c = read_eeprom(AdLp);
:= printf("\r\n\%2d",eedata_c);
:= delay_ms(5);
:= AdLp++;
:= } ___________________________
This message was ported from CCS's old forum
Original Post ID: 3839

[Mark]

:=I'm using version 3.084 PCH Compiler .
:=The code dosen't work in 18f452 with write_eeprom() .
:=
:=Data EEprom Write:
:= AdLp = 0;
:= while(AdLp < 4)
:= {
:= write_eeprom(AdLp,AdLp);
:= delay_ms(5);
:= AdLp++;
:= }
:=Data EEprom Read:
:= AdLp = 0;
:= while(AdLp < 4)
:= {
:= eedata_c = read_eeprom(AdLp);
:= printf("\r\n\%2d",eedata_c);
:= delay_ms(5);
:= AdLp++;
:= }
___________________________
This message was ported from CCS's old forum
Original Post ID: 3856