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Discussion Groups | Analog Devices DSPs | 2181 asm program for Logarithm & other lib functions
Technical discussions related to Analog Devices DSPs (including Blackfin, TigerSHARC, SHARC and ADSP-21xx DSPs).
2181 asm program for Logarithm & other lib functions - jsc_1978 - Oct 28 1:11:00 2003
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Hi, I am using the ADSP-2181 EZ-KIT Lite. Can anyone direct me to an asm program that calculates log base 10? Also, I heard that ADI offers asm code for all of their library functions. Is this true? I haven't had any luck calling C functions from assembly programs. Thanks, Jessica |
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Re: 2181 asm program for Logarithm & other lib functions - Mike Rosing - Oct 28 3:13:00 2003
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On Tue, 28 Oct 2003, jsc_1978 wrote: > I am using the ADSP-2181 EZ-KIT Lite. > > Can anyone direct me to an asm program that calculates log base 10? > Also, I heard that ADI offers asm code for all of their library > functions. Is this true? I haven't had any luck calling C > functions from assembly programs. It's easier to do log base 2 and then multiply by log base 10 of 2. Since you already store data in base 2, you just need to find log base 2 (fractional part) and add the exponent to get log base 2 of the number. Find "Computer Approximations" by Hart for lots of coefficients. You can get any level of accuracy you need. Patience, persistence, truth, Dr. mike |
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