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Does anyone know a way to generate psuedo random numbers in assembly for the hc11 / hc12 / hcs12? Thank you for the help. --Eric |
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Random Number Generation
Started by ●July 11, 2003
Reply by ●July 11, 20032003-07-11
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This is how its done in the Borland runtime library.....
#include <stdlib.h> #define MULTIPLIER 0x015a4e35L #define INCREMENT 1 static long Seed = 1; /*---------------------------------* Name srand - initializes random number generator Usage void srand(unsigned seed); Prototype in stdlib.h Description see rand below Return value Nothing *---------------------------------*/ void srand(unsigned seed) { Seed = seed; } /*---------------------------------* Name rand - random number generator Usage int rand(void); Related functions usage void srand(unsigned seed); Prototype in stdlib.h Description rand uses a multiplicative congruential random number generator with period 2^32 to return successive pseudo- random numbers in the range from 0 to 2^15 - 1. The generator is reinitialized by calling srand with an argument value of 1. It can be set to a new starting point by calling srand with a given seed number. *---------------------------------*/ int rand(void) { Seed = MULTIPLIER * Seed + INCREMENT; return((int)(Seed >> 16) & 0x7fff); } |
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Reply by ●July 11, 20032003-07-11
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Yes, well Numerical Recipes in C has a whole chapter on the topic
(chapter 7 to be exact). It starts off with a critique of exactly this technique. Here are all the gory details: http://www.ma.utexas.edu/documentation/nr/bookcpdf/c7-1.pdf Gary Olmstead Toucan Technology Ventura CA At 11:07 AM 7/11/03 -0400, you wrote: >This is how its done in the Borland runtime library..... > |
Reply by ●July 12, 20032003-07-12
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Hi, The old Apple II (6502) did an increment in RAM in the main program loop. I would try the same by incrementing a 16 bit address, so every time you read that address, the random number is between o and 65535. Regards Paul ericshufro wrote: >Does anyone know a way to generate psuedo random numbers in assembly >for the hc11 / hc12 / hcs12? > >Thank you for the help. > >--Eric > >-------------------- > >">http://docs.yahoo.com/info/terms/ |
