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Saving a Floating point num to e2rom

 
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Got PIC



Joined: 21 Mar 2008
Posts: 10

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Saving a Floating point num to e2rom
PostPosted: Sat Mar 22, 2008 5:11 pm     Reply with quote

I tried the CCS examples for saving a floating point number.
I tried to write a 1.0001 to starting local e2rom address of 38. What get's displayed is 255.000

I'm not sure what I'm doing wrong.?.

Can anyone help?

void test_display_flaot()
{
int16 long_i = 0;
float float_i = 1.0001;
float float_i_b = 0;
int i=0;

write_float_eeprom(38,1.0001);
float_i_b = (float)read_float_eeprom(38);
fprintf(COMM_PORT2,"fVal:[%3.6f] \n\r"float_i_b); //DEBUG TEST
}


void write_float_eeprom(int16 e2_addr, float data) //e2_addr = Start of E2 rom address. Data = Floating point number to convert
{
int8 i;

for (i = 0; i < 4; i++)
{
write_eeprom(i + e2_addr, *(((int8*)&data + i) )) ;
}
}


float read_float_eeprom(int16 e2_addr)
{
int i;
float data;
for (i = 0; i < 4; i++)
{
*(((int8*)&data + i) = read_eeprom(i + e2_addr);
}
return(data);
}
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sat Mar 22, 2008 5:41 pm     Reply with quote

Quote:
float read_float_eeprom(int16 e2_addr)
{
int i;
float data;
for (i = 0; i < 4; i++)
{
*(((int8*)&data + i) = read_eeprom(i + e2_addr);
}
return(data);
}

You have an extra parenthesis on the left side of the (*int8).
It won't compile.

Quote:
fprintf(COMM_PORT2,"fVal:[%3.6f] \n\r"float_i_b);

You're missing the comma after the format string.
This won't compile either.

Quote:
void test_display_flaot()

"float" is spelled wrong.

Therefore, this is not the real code that you tested. It doesn't compile.
Also, you should specify the PIC that you're using and your compiler version.
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