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How to declare 64 bit float in PIC16F877A?!?!?!?!?

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mugheesahmed

Joined: 12 Jun 2006
Posts: 9

How to declare 64 bit float in PIC16F877A?!?!?!?!?
Posted: Wed Mar 14, 2007 8:17 am

hello everybody!!! Is there anyway that i could declare a 64 bit floating point number in a PIC 16F877A ?!?!?!?!?!?!?!? 32 bit float is not enough to store the decimal places of 7 and above which i actually need....is there any library i could use or sumthing..??? need help urgently... Mughees

Humberto

Joined: 08 Sep 2003
Posts: 1215
Location: Buenos Aires, La Reina del Plata

Posted: Wed Mar 14, 2007 9:09 am

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Quote:

Is there anyway that i could declare a 64 bit floating point number in a PIC 16F877A

Double precision is not allowed in CCS.

Quote:

32 bit float is not enough to store the decimal places of 7 and above which i actually need....

Are you going to store such a big values in floats ?

Humberto

Guest

Posted: Wed Mar 14, 2007 9:49 am

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Quote:

32 bit float is not enough to store the decimal places of 7 and above which i actually need....

actually it is not a big value...
its something like this

'0.00000021341'

i need the digits after the sixth zero after the decimal...these digits are not stored in a 32 bit floating point number...so actually i needed more precision...
is there a way to solve this directly or indirectly???

Quote:

Are you going to store such a big values in floats ?

where else can i store it then?? :/

Humberto

Joined: 08 Sep 2003
Posts: 1215
Location: Buenos Aires, La Reina del Plata

Posted: Wed Mar 14, 2007 10:32 am

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Quote:

i need the digits after the sixth zero after the decimal...these digits are not stored in a 32 bit floating point number...so actually i needed more precision...

They should.
0.00000021341 = 0x686525B2

Could you point us the range of the values that you need to handle and store ?
Could you pls be more explicit about your procedure to store these values ?

Humberto

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