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How to write to EEPROM?

 
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PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Thu Nov 15, 2007 4:53 pm     Reply with quote
Here is a demo program that shows how to save floats in internal eeprom.
The code is based on this CCS FAQ article:
http://www.ccsinfo.com/faq.php?page=write_eeprom_not_byte
Code:

#include <16F690.h>
#fuses INTRC_IO, NOWDT, BROWNOUT, PUT, MCLR
#use delay(clock=8000000)
#use rs232(baud=9600, xmit=PIN_B7, rcv=PIN_B5, ERRORS)

void write_float_to_eeprom(int8 addr, float data)
{
 int8 i;

 for(i = 0; i < 4; i++)
     write_eeprom(addr + i, *((int8*)&data + i) ) ;
}

//--------------------------------------
float read_float_from_eeprom(int8 addr)
{
int8 i;
float data;

for(i = 0; i < 4; i++)
   *((int8*)&data + i) = read_eeprom(addr + i);

return(data);
}


//==========================
main()
{
float value1, value2, value3, result;

value1 = 1.234;
value2 = -4.567;
value3 = 567.89;

// Write the float values to internal eeprom.
// Floats take 4 bytes, so the eeprom addresses must
// be spaced 4 bytes apart, as shown below.
write_float_to_eeprom(0, value1);
write_float_to_eeprom(4, value2);
write_float_to_eeprom(8, value3);

// Read the floats from eeprom and display them.
result = read_float_from_eeprom(0);
printf("Addr 0:  result = %7.3f \n\r", result);
result = read_float_from_eeprom(4);
printf("Addr 4:  result = %7.3f \n\r", result);
result = read_float_from_eeprom(8);
printf("Addr 8:  result = %7.3f \n\r", result);

while(1);
}
 
ThomasC



Joined: 09 Oct 2007
Posts: 62

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PostPosted: Fri Nov 16, 2007 9:35 am     Reply with quote
Thank you man. It works! Laughing
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