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removed unused variables 

removed unused variables in fastMap1023toX function
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VitorBoss 2016-10-05 13:44:09 -03:00 committed by GitHub
parent cb4d0b9ab6
commit 3feefef1a7
1 changed files with 25 additions and 1 deletions
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26
math.h
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@ -10,11 +10,35 @@ int fastMap(unsigned long x, int in_min, int in_max, int out_min, int out_max)
//This is a dedicated function that specifically handles the case of mapping 0-1023 values into a 0 to X range
//This is a common case because it means converting from a standard 10-bit analog input to a byte or 10-bit analog into 0-511 (Eg the temperature readings)
int fastMap1023toX(unsigned long x, int in_min, int in_max, int out_min, int out_max)
//int fastMap1023toX(unsigned long x, int in_min, int in_max, int out_min, int out_max)
//removed unused variables, in_min and out_min is aways 0, in_max is aways 1023
int fastMap1023toX(unsigned long x, int out_max)
{
return (x * out_max) >> 10;
}
/*
//Unsigned int assembly multiply, result in 20 clocks
//Need speed test
unsigned long hwdu16(unsigned int x, unsigned int y){
unsigned long result;
asm("mul _y, _x"); //arg1l * arg2l - >
asm("movw _result+2, r0");
asm("movf _y+1,_x+1");//arg1h * arg2h - >
asm("movw _result, r0");
asm("mul _y, _x+1"); //arg1l * arg2h - >
asm("add _result+2,r0");//add cross
asm("adc _result+1,r1");//products
asm("clr r0");
asm("adc _result,r0");
asm("mul _y+1, _x"); //arg1h * arg2l - >
asm("add _result+2,r0");//add cross
asm("adc _result+1,r1");//products
asm("clr r0");
asm("adc _result,r0");
return(result);
}*/
/*
The following are all fast versions of specific divisions
Ref: http://www.hackersdelight.org/divcMore.pdf