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read/write int32 on internal EEPROM

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Joan

Joined: 29 May 2004
Posts: 41
Location: Barcelona, Spain

read/write int32 on internal EEPROM

Posted: Wed Sep 23, 2009 9:39 am

Hi all,

i'm trying to store 32bit data on internal eeprom and after to recover it .

Functions I'm using.

Code:

CCS Compiler version: 4.023

For write:

Code:

void write_float_eeprom(int32 n, int32 data)
{
int i;

for (i = 0; i < 4; i++)
{
write_eeprom(i + n, *((int *)&data + i) ) ;
}
}

For read:

Code:

float read_float_eeprom(int32 int n)
{
int i;
int32 data;

for (i = 0; i < 4; i++)
{
*((int *)&data + i) = read_eeprom(i + n);
}
return(data);
}

Code:

Code:

void read_EEPROM_setup ()
{
write_float_eeprom (0x00000000, 0x1234567F);
printf ("\fData stored in EEPROM\r\n");
delay_ms (500);
printf ("Data EEPROM Read\r\n");
data_32bits = read_float_eeprom (0x00000000);
printf ("32bit data: 0x%8LX\r\n", data_32bits);
printf ("[0]: 0x%X\r\n", read_eeprom (0x00));
printf ("[1]: 0x%X\r\n", read_eeprom (0x01));;
printf ("[2]: 0x%X\r\n", read_eeprom (0x02));
printf ("[3]: 0x%X\r\n", read_eeprom (0x03));
delay_ms (5000);
}

Results:

Code:

Data stored in EEPROM
Data EEPROM Read
32bit data: 0x0000007F
[0]: 0x7F
[1]: 0x56
[2]: 0x34
[3]: 0x12

So this function:

Code:

data_32bits = read_float_eeprom (0x00000000);

seems to not work. Anybody has this problem ?. I'd tested previous post but with no luck.

Regards,

Joan

PCM programmer

Joined: 06 Sep 2003
Posts: 21708

Posted: Wed Sep 23, 2009 11:24 am

Quote:

I'm trying to store 32bit data on internal eeprom and after to recover it.

I assume this means you want to read and write an 'int32' to eeprom.

Read your code with a critical eye:

Quote:

float read_float_eeprom(int32 int n)
{
int i;
int32 data;

for (i = 0; i < 4; i++)
{
*((int *)&data + i) = read_eeprom(i + n);
}
return(data);
}

1. What is wrong with the function parameters ?
What is your intention, and what do actually have in the code above ?

2. What is wrong with the return value data type ?
What data type do you intend to return, and what type have you
told the function to return ?

3. Also, just as a cosmetic issue, you want to read and write an 'int32'
to the eeprom. What is wrong with the names you have given to the
functions ? What should the names of the functions be, if you want to
give them accurate names ?

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