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float to byte and byte to float

 
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young



Joined: 24 Jun 2004
Posts: 285

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float to byte and byte to float
PostPosted: Fri Jul 09, 2004 12:09 pm     Reply with quote
I have float data
float Total;

and I used following method to change them into BYTE, here datanum is the address
Code:

    write_ext_eeprom(datanum, shift_right(&Total,24,0) & 0xFF);
     datanum=datanum+1;
     write_ext_eeprom(datanum, shift_right(&Total,16,0) & 0xFF);
     datanum=datanum+1;
     write_ext_eeprom(datanum, shift_right(&Total,8,0) & 0xFF);
     datanum=datanum+1;
     write_ext_eeprom(datanum, shift_right(&Total,0,0) & 0xFF);
     datanum=datanum+1;


to save them into a external memory
AM I right

Right now I need to read them from external memory to chip ram and transfer from BYTE to float

here
BYTE temp;
I need do something like these,put t\four byte reading into a float memory and display them, the following code is wrong, what is the correct one?
Code:


     temp=read_ext_eeprom(datanum);
     datanum=datanum+1;
     Total=shift_left(temp,24,0);
     temp=read_ext_eeprom(datanum);
     datanum=datanum+1;
     Total=Total |(temp<<16);
     read_ext_eeprom(datanum, temp);
     datanum=datanum+1;
     Total=Total |(temp<<8);
     temp=read_ext_eeprom(datanum);
     datanum=datanum+1;
     Total=Total |temp;


however, from byte to float error message[/quote]
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Fri Jul 09, 2004 12:50 pm     Reply with quote
See the CCS FAQ topic which shows how to write and read a float
variable to EEPROM: http://www.ccsinfo.com/faq/?24


Here is the main CCS FAQ page:
http://www.ccsinfo.com/faq/
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