Re: [avr-gcc-list] double precision bit representation
On Thursday 07 Jul 2005 5:00 am IST, Parthasaradhi Nayani wrote: Hello Nayani, When you say avr-gcc supports only float and not double do you mean that when a variable in declared as double, it is equivalent of declaring it as float? Thanks for giving me the decimal equivalent of the byte pattern. I would like to know how you do it. I tried googling around to get info but failed. May be i was not searching right! -- Cheers! Kitts PN Hello, PN PN Currently avr-gcc supports only float and not double. PN The byte pattern given in your query results in a PN float value of -1.135254 PN PN Nayani P PN PN PN --- Kitts [EMAIL PROTECTED] wrote: PN PN Hi all, PN PN I would like to know how a variable declared as PN double is represented with PN avr-libc. What is the maximum and minimum values PN that it can represent and PN with what resolution? I am performing floating point PN math which fails in PN certain occasion where i think it shouldn't. Hence PN my query... PN PN For an example i have a double variable called PN TempDouble which is placed PN at the following address in SRAM with each of the PN byte having the given PN value. How do i interpret this value in decimal? PN PN Ram Address: $0B6F $0B70 $0B71 $0B72 PN Value:00 50 91 3F PN PN Thanks in Advance. PN -- PN Cheers! PN Kitts PN PN PN PN ___ PN AVR-GCC-list mailing list PN AVR-GCC-list@nongnu.org PN PN http://lists.nongnu.org/mailman/listinfo/avr-gcc-list PN PN PN PN __ PN Do You Yahoo!? PN Tired of spam? Yahoo! Mail has the best spam protection around PN http://mail.yahoo.com PN PN PN ___ PN AVR-GCC-list mailing list PN AVR-GCC-list@nongnu.org PN http://lists.nongnu.org/mailman/listinfo/avr-gcc-list PN ___ AVR-GCC-list mailing list AVR-GCC-list@nongnu.org http://lists.nongnu.org/mailman/listinfo/avr-gcc-list
Re: [avr-gcc-list] double precision bit representation
Ram Address:$0B6F $0B70 $0B71 $0B72 Value: 00 50 91 3F I think this page is help full: http://www.psc.edu/general/software/packages/ieee/ieee.html I get it to 1.13525390625 -Bjarne Laursen, RoseTechnology A/S ___ AVR-GCC-list mailing list AVR-GCC-list@nongnu.org http://lists.nongnu.org/mailman/listinfo/avr-gcc-list
AW: [avr-gcc-list] double precision bit representation
Title: AW: [avr-gcc-list] double precision bit representation see http://babbage.cs.qc.edu/courses/cs341/IEEE-754hex32.html :-Ursprüngliche Nachricht- :Von: [EMAIL PROTECTED] :[mailto:[EMAIL PROTECTED] :nu.org]Im :Auftrag von Bjarne Laursen :Gesendet: Donnerstag, 7. Juli 2005 10:52 :Cc: avr-gcc-list@nongnu.org :Betreff: Re: [avr-gcc-list] double precision bit representation : : : :Ram Address: $0B6F $0B70 $0B71 $0B72 :Value: 00 50 91 : 3F : : :I think this page is help full: :http://www.psc.edu/general/software/packages/ieee/ieee.html : :I get it to 1.13525390625 : :-Bjarne Laursen, RoseTechnology A/S : : :___ :AVR-GCC-list mailing list :AVR-GCC-list@nongnu.org :http://lists.nongnu.org/mailman/listinfo/avr-gcc-list : ___ AVR-GCC-list mailing list AVR-GCC-list@nongnu.org http://lists.nongnu.org/mailman/listinfo/avr-gcc-list
Re: AW: [avr-gcc-list] double precision bit representation
Thanks Stumpf and Bjarne. Both of those pages are very helpful. It has made me more cautious about endianess! Within my projects, i was going to implement a binary mode serial communication between dissimilar platforms. I will need to be careful with which byte i put/get out of the port first. I'll ensure a Most Significant Bit/Byte first. :-) Thanks again. -- Cheers! Kitts On Thursday 07 Jul 2005 8:09 pm IST, Stumpf Michael wrote: SM see http://babbage.cs.qc.edu/courses/cs341/IEEE-754hex32.html SM SM :-Ursprüngliche Nachricht- SM :Von: [EMAIL PROTECTED] SM :[mailto:[EMAIL PROTECTED] SM :nu.org]Im SM :Auftrag von Bjarne Laursen SM :Gesendet: Donnerstag, 7. Juli 2005 10:52 SM :Cc: avr-gcc-list@nongnu.org SM :Betreff: Re: [avr-gcc-list] double precision bit representation SM : SM : SM : SM :Ram Address: $0B6F $0B70 $0B71 $0B72 SM :Value:00 50 91 SM : 3F SM : SM : SM :I think this page is help full: SM :http://www.psc.edu/general/software/packages/ieee/ieee.html SM : SM :I get it to 1.13525390625 SM : SM :-Bjarne Laursen, RoseTechnology A/S SM : SM : SM :___ SM :AVR-GCC-list mailing list SM :AVR-GCC-list@nongnu.org SM :http://lists.nongnu.org/mailman/listinfo/avr-gcc-list SM : SM ___ AVR-GCC-list mailing list AVR-GCC-list@nongnu.org http://lists.nongnu.org/mailman/listinfo/avr-gcc-list
[avr-gcc-list] double precision bit representation
Hi all, I would like to know how a variable declared as double is represented with avr-libc. What is the maximum and minimum values that it can represent and with what resolution? I am performing floating point math which fails in certain occasion where i think it shouldn't. Hence my query... For an example i have a double variable called TempDouble which is placed at the following address in SRAM with each of the byte having the given value. How do i interpret this value in decimal? Ram Address:$0B6F $0B70 $0B71 $0B72 Value: 00 50 91 3F Thanks in Advance. -- Cheers! Kitts ___ AVR-GCC-list mailing list AVR-GCC-list@nongnu.org http://lists.nongnu.org/mailman/listinfo/avr-gcc-list
Re: [avr-gcc-list] double precision bit representation
Hello, Currently avr-gcc supports only float and not double. The byte pattern given in your query results in a float value of -1.135254 Nayani P --- Kitts [EMAIL PROTECTED] wrote: Hi all, I would like to know how a variable declared as double is represented with avr-libc. What is the maximum and minimum values that it can represent and with what resolution? I am performing floating point math which fails in certain occasion where i think it shouldn't. Hence my query... For an example i have a double variable called TempDouble which is placed at the following address in SRAM with each of the byte having the given value. How do i interpret this value in decimal? Ram Address: $0B6F $0B70 $0B71 $0B72 Value:00 50 91 3F Thanks in Advance. -- Cheers! Kitts ___ AVR-GCC-list mailing list AVR-GCC-list@nongnu.org http://lists.nongnu.org/mailman/listinfo/avr-gcc-list __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ___ AVR-GCC-list mailing list AVR-GCC-list@nongnu.org http://lists.nongnu.org/mailman/listinfo/avr-gcc-list
