Q15 Library
mikroC PRO for ARM includes a library for operating and working with Q15 fractional number format.
Library Routines
- Q15_Abs
- Q15_Add
- Q15_Sub
- Q15_Itof
- Q15_Ftoi
- Q15_Itoa
- Q15_Atoi
- Q15_Sin
- Q15_Cos
- Q15_Tan
- Q15_Asin
- Q15_Acos
- Q15_Atan
- Q15_Log
Q15_Abs
Prototype |
unsigned int Q15_Abs (int in); |
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Description |
Function calculates absolute value of the Q15 fractional format number. |
Parameters |
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Returns |
Function returns Q15 output number. |
Q15_Add
Prototype |
char Q15_Add(int x, int y, int *z); |
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Description |
Function sums two Q15 format numbers. If the result exceeds [-32768, 32767] limits, result will be maximal(minimal) number in Q15 format. |
Parameters |
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Returns |
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Q15_Sub
Prototype |
char Q15_Sub(int x, int y, int *out); |
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Description |
Function subtracts two Q15 format numbers. If the result exceeds [-32768, 32767] limits, result will be maximal(minimal) number in Q15 format. |
Parameters |
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Returns |
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Q15_Itof
Prototype |
float Q15_Itof(int x); |
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Description |
Function converts number from the Q15 fractional number format to floating point number format. |
Parameters |
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Returns |
Function returns resulting floating point number. |
Q15_Ftoi
Prototype |
int Q15_Ftoi(float f); |
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Description |
Function converts number from the floating point number format to Q15 fractional number format. Input number scope should be in the range of [-1.00000, 0.99996]. If the floating point number is not in this range, the resulting number will be 0x7FFF (0x8000). |
Parameters |
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Returns |
Function returns resulting Q15 fractional format number. |
Q15_Itoa
Prototype |
void Q15_Itoa(int x, char *s); |
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Description |
Function converts number from the Q15 fractional format to ASCII string. Output ASCII string is in the following format : sn.ddddddddddddddd
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Parameters |
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Returns |
Nothing. |
Q15_Atoi
Prototype |
unsigned int Q15_Atoi(char *s, int *out); |
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Description |
Function converts the input ASCII string s into a number in Q15 fractional point format. Input ASCII string should be in the following format: sn.ddddddddddddddd
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Parameters |
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Returns |
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Q15_Cos
Prototype |
int Q15_Cos(int x); |
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Description |
Function returns the cosine of |
Parameters |
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Returns |
Function returns value in the Q15 format, ranging from 17748 to 32767. |
Q15_Sin
Prototype |
int Q15_Sin(int x); |
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Description |
Function returns the sine of |
Parameters |
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Returns |
Function returns value in the Q15 format, ranging from -27580 to 27578. |
Q15_Tan
Prototype |
int Q15_Tan(int x); |
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Description |
Function returns the tangent of |
Parameters |
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Returns |
Function returns value in the Q15 format, ranging from -32768 to 32767. |
Q15_Asin
Prototype |
int Q15_Asin(int x); |
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Description |
Function returns the arc sine of |
Parameters |
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Returns |
Function returns value in the Q15 format, ranging from -32768 to 32767. |
Q15_Atan
Prototype |
int Q15_Atan(int x); |
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Description |
Function returns the arc tangent of |
Parameters |
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Returns |
Function returns value in the Q15 format, ranging from -25532 to 25509. |
Q15_Acos
Prototype |
int Q15_Acos(int x); |
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Description |
Function returns the arc cosine of |
Parameters |
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Returns |
Function returns value in the Q15 format, ranging from 2887 to 32767. |
Q15_Log
Prototype |
int Q15_Log(int x); |
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Description |
Function returns the logarithm of |
Parameters |
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Returns |
Function returns value in the Q15 format, ranging from -32748 to 0. |
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