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convert fixed point number to float point number
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| #include <stdio.h> | |
| #include <math.h> | |
| #define FIXED_BIT 12 | |
| float fix2float(unsigned short int n) | |
| { | |
| float ret = 0.0; | |
| int integer_part; | |
| int i; | |
| integer_part = (n >> 12); | |
| ret += integer_part; | |
| for (i = 0; i < FIXED_BIT; i++) { | |
| ret += ((n >> (FIXED_BIT - i - 1)) & (0x01)) * (1.0 / pow(2, i+1)); | |
| } | |
| return ret; | |
| } | |
| int main() | |
| { | |
| unsigned short int n; | |
| n = 10240; // 2.5 | |
| printf("%d => %f\n", n, fix2float(n)); | |
| n = 10752; // 2.625 | |
| printf("%d => %f\n", n, fix2float(n)); | |
| return 0; | |
| } |
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