// Convert Q4.12 back to float float q4_12_to_float(q4_12_t x) return (float)x / (1 << 12);
Since this is not a standard term in mainstream programming (C++, Java, Python, etc.), I have interpreted it through the lens of and Embedded Systems —where "4Q" and "FP/PF" are commonly used notation.
#include <stdio.h> #include <stdint.h> // Define a Q4.12 fixed-point type (16 bits total) typedef int16_t q4_12_t; 4q fp pf data type
printf("Original: %f\n", original); printf("Q4.12 fixed-point integer: %d\n", fixed); printf("Restored: %f\n", restored);
But in the world of and FPGA programming , this cryptic string actually tells you everything about how a number is stored—without using a single floating-point unit. // Convert Q4
// Packing example uint32_t packed = pack_q4_12_pair(fixed, fixed); printf("Packed PF (32-bit): 0x%08X\n", packed);
int main() float original = 3.14159f; q4_12_t fixed = float_to_q4_12(original); float restored = q4_12_to_float(fixed); printf("Q4.12 fixed-point integer: %d\n"
// Pack two Q4.12 values into one 32-bit "PF" type uint32_t pack_q4_12_pair(q4_12_t a, q4_12_t b) (uint32_t)(b & 0xFFFF);