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Sid2286
Joined: 12 Aug 2010
Posts: 119
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| How to store float value in EEPROM |
 Posted: Tue Aug 16, 2011 12:32 am |
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Hi,
I'm in a problem don't understand how to do it!
1. I have a variable type float where I cannot use '%' sign as an operator.
2. using write_eeprom(adress,value) value is int type so I guess cannot pass float.
how do i do it?
My code is something like this:
| Code: |
printf(lcd_putc," \fEnter\nCalibration value.");
delay_ms(1000);
cali = read_button(); // cali = float
delay_ms(1000);
printf(lcd_putc," \f Present\n Value");
delay_ms(1000);
f=read_button(); // f= float
delay_ms(1000);
cali=cali/f;
printf(lcd_putc,"\f Cal.\nSaved");
delay_ms(1000);
break;
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And for storing the value i'm using something like:
| Code: |
temEE=cali/256;
write_eeprom(10,temEE);
temEE=cali%256; // Error cannot use % for float
write_eeprom(11,temEE);
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Please help, I thought of using an int pointer and doing it, but thats way too lengthy way to do it, if any one has a better way please help!
thanks,
Sid |
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asmallri
Joined: 12 Aug 2004
Posts: 1635
Location: Perth, Australia
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| Re: How to store float value in EEPROM |
| Posted: Tue Aug 16, 2011 3:17 am |
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| Sid2286 wrote: | Hi,
I'm in a problem don't understand how to do it!
1. I have a variable type float where I cannot use '%' sign as an operator.
2. using write_eeprom(adress,value) value is int type so I guess cannot pass float.
how do i do it?
My code is something like this:
| Code: |
printf(lcd_putc," \fEnter\nCalibration value.");
delay_ms(1000);
cali = read_button(); // cali = float
delay_ms(1000);
printf(lcd_putc," \f Present\n Value");
delay_ms(1000);
f=read_button(); // f= float
delay_ms(1000);
cali=cali/f;
printf(lcd_putc,"\f Cal.\nSaved");
delay_ms(1000);
break;
|
And for storing the value i'm using something like:
| Code: |
temEE=cali/256;
write_eeprom(10,temEE);
temEE=cali%256; // Error cannot use % for float
write_eeprom(11,temEE);
|
Please help, I thought of using an int pointer and doing it, but thats way too lengthy way to do it, if any one has a better way please help!
thanks,
Sid |
| Code: |
BYTE i, offset, *ptr;
offset = 10; // or whatever the offset is meant to be
ptr = (BYTE*)&cali;
for (i=0, i < sizeof(cali),i++)
write_eeprom(offset++,*ptr++);
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_________________
Regards, Andrew
http://www.brushelectronics.com/software
Home of Ethernet, SD card and Encrypted Serial Bootloaders for PICs!! |
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SherpaDoug
Joined: 07 Sep 2003
Posts: 1640
Location: Cape Cod Mass USA
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| Posted: Tue Aug 16, 2011 5:45 am |
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Look at the make8() and make32() functions. You store data to EEPROM as bytes. Break larger structures (like floats) into to bytes and put the bytes into EEPROM.
_________________
The search for better is endless. Instead simply find very good and get the job done. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue Aug 16, 2011 12:59 pm |
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CCS has a driver file with routines to store floats and ints in eeprom:
| Quote: |
c:\program files\picc\drivers\internal_eeprom.c
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Just #include it in your program and call the appropriate routines.
There is also another file with routines for external eeprom. |
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