SX Microcontroller Basic Math Methods

Use the expression evaluator to translate a mathematical formula from infix to postfix and then into actual code

November 2003 MassMind newsletter - 32 Bit math routines

Add

Subtract

Increment / Decrement

• General Purpose from Dmitry Kiryashov
• Best 16 bit from Scott Dattalo
• 32 bit and detect zero from Dmitry Kiryashov, Rich Leggitt, Andrew Warren, and Scott Dattalo

Two's complement / Negate

• 32 bit (unknown author, please step forward)
• 8 bit from Andy Warren

Multiply

Divide

Reciprocal

• 32768 / x by Nikolai Golovchenko

Scale

• 8 bit to a percentage from Scott Dattalo with optional precision increase from Nikolai Golovchenko
• 8 bit to a percentage fast from Jason Harper
• 8 bit to a percentage accurate from Dmitry Kiryashov

Square

Square Root

see also:

• Scenix math pack (source, notes), sin&fft (source, notes)
• Vector Magnatude by Nikolai Golovchenko
• PIC Math Routines: (use the PIC MPASM source to SX SASM Source Converter by Nikolai Golovchenko)
  • http://www.markworld.com/microtools.html excellent math (Generate 8 or 16 bit PIC code to evaluate an infix expression. Analyze an IEEE floating point number) and servos
  • http://www.microchip.com Math Library Application Notes AN575 Floating Point and AN617 Fixed Point
  • http://ndsl226.dnvr.uswest.net/cgi-bin/tl.exe/AERC/Poscalc/math1h.asm 64-bit floating point library
  • http://ndsl226.dnvr.uswest.net/cgi-bin/tl.exe/AERC/Poscalc/ SIN, COS, SQRT, etc., routines
  • http://www.ken.webster.org/projects/poscalc/

Questions:

• http://www.silab.it/frox/stamp/bs2_math.htm BCD math for the BASIC stamp. Compile to SX code with SX/B?+

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