arduino32-bitieee-754single-precision

Arduino convert float to hex IEEE754 Single precision 32-bit

I would like to convert float values ​​to IEEE754 Single precision 32-bit Hex values ​​in the following site on Arduino. https://www.binaryconvert.com/result_float.html?decimal=051046049048

float f = 3.10;
byte hex[4] = {0};

byte FloatToHex(float f){
   .......
}

How can I create a function like this? It's okay if the format is different.

Solution

  • f is already stored in binary. reinterpret_cast is generally a code smell issue, but its valid use is to view the byte representation of variables.

    
void FloatToHex(float f, byte* hex){
  byte* f_byte = reinterpret_cast<byte*>(&f);
  memcpy(hex, f_byte, 4);
}

void setup() {
  float f = 3.10;
  byte hex[4] = {0};

  FloatToHex(f, hex);
  //... do stuff with hex now...
}

void loop() {
  
}