CCS :: View topic - read/write int32 on internal EEPROM

FAQ

Forum Help

Official CCS Support

Profile Log in to check your private messages Log in

CCS does not monitor this forum on a regular basis.

Please do not post bug reports on this forum. Send them to CCS Technical Support

read/write int32 on internal EEPROM

CCS Forum Index -> General CCS C Discussion

View previous topic :: View next topic

Author

Message

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 ?

Display posts from previous:

	CCS Forum Index -> General CCS C Discussion	All times are GMT - 6 Hours
Page 1 of 1

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum