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convert floating point number to fixed point number
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| #include <stdio.h> | |
| #include <math.h> | |
| #define FIXED_BIT 12 | |
| unsigned short int float2fix(float n) | |
| { | |
| unsigned short int int_part = 0, frac_part = 0; | |
| int i; | |
| float t; | |
| int_part = (int)floor(n) << FIXED_BIT; | |
| n -= (int)floor(n); | |
| t = 0.5; | |
| for (i = 0; i < FIXED_BIT; i++) { | |
| if ((n - t) >= 0) { | |
| n -= t; | |
| frac_part += (1 << (FIXED_BIT - 1 - i)); | |
| } | |
| t = t /2; | |
| } | |
| return int_part + frac_part; | |
| } | |
| int main() | |
| { | |
| float n; | |
| n = 2.5; // 0d10240 | |
| printf("%f => %d\n", n, float2fix(n)); | |
| n = 2.625; // 0d10752 | |
| printf("%f => %d\n", n, float2fix(n)); | |
| n = 0.375; // 0d1536 | |
| printf("%f => %d\n", n, float2fix(n)); | |
| return 0; | |
| } |
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