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Need a bit of help with ASM?
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How do i make my chip 'randomly' generate numbers given these set of instuctions ranging from 1-6? http://talking-electronics.netfirms.com/page-25.html.
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Re: Need a bit of help with ASM?
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by
on 2009-11-08 19:01:00 |
This is the standard C library rand() function, you could implement this in assembly:static unsigned long seed = 1;
int rand_r(unsigned long* seed)
{
unsigned long ulR1 = -*(long*)seed & 0x0000ffff;
unsigned long ulR2 = (-*(long*)seed >> 16) & 0x0000ffff;
ulR1 *= 642;
ulR2 *= 642;
ulR2 += ulR1 >> 16;
ulR1 = (ulR2 << 16) + (ulR1 & 0x0000ffff);
ulR2 >>= 16;
ulR2 -= ulR1;
*seed = ulR2 + 0x60608420;
*seed &= 0x7FFFFFFF;
return( *(int*)seed );
} 
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Re: Need a bit of help with ASM?
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Sad to say, but I am illiterate with C. Hence, I don't understand what '>>' or 'seed' means. Looks like a bit of research is required on my side. Thanks anyways.
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