forked from haraldwolff/avr-fw-modules
44 lines
807 B
C
Executable File
44 lines
807 B
C
Executable File
#include "hwo/fixpoint.h"
|
|
|
|
#if ((RAMEND - RAMSTART) >= 102400) // Only with more than 100kB SRAM for now...
|
|
|
|
/* Lookup auf sinus tabelle... */
|
|
extern uint32_t __sin090[90<<8];
|
|
|
|
fixpoint_t fp_sin_lookup(fixpoint_t arc090)
|
|
{
|
|
int32_t index = (arc090 >> 8); // Lookup Table has index format fixpoint 24.8
|
|
if (index < 0)
|
|
return 0;
|
|
if (index > (90<<8))
|
|
return 0;
|
|
return __sin090[ index ];
|
|
};
|
|
|
|
/* Reverse Lookup auf SINUS Tabelle */
|
|
fixpoint_t fp_sin_lookup_reverse(fixpoint_t sin)
|
|
{
|
|
int32_t hi = 0,
|
|
index = 0;
|
|
|
|
for (hi = 0; __sin090[ hi<<8 ] <= sin ; hi++);
|
|
index = hi << 8;
|
|
while (__sin090[ index-- ] <= sin);
|
|
|
|
return (index << 8);
|
|
};
|
|
|
|
#else
|
|
|
|
fixpoint_t fp_sin_lookup(fixpoint_t arc090)
|
|
{
|
|
return fp_make(0);
|
|
};
|
|
|
|
fixpoint_t fp_sin_lookup_reverse(fixpoint_t sin)
|
|
{
|
|
return fp_make(0);
|
|
};
|
|
|
|
#endif
|