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conversion of hex data to float inverse

harish yadav
Intellectual 490 points
Other Parts Discussed in Thread: MSP430G2553

I am trying to communicate a electric meter using rs485 and msp430g2553 microcontroller. The meter sends hex data, now i want to convert hex data into inverse float value. Is there any library function or function command to do that.

For eg : Hex data is {0x43,0xCF,0x80,0x00}   // inverse float value is 415.0

How to convert it into  float value.

  • 0
    Guru 317480 points

    "Hex" and "binary" are two different concepts.

    This looks like a big-endian float; just reverse the order of the bytes, and treat the memory as a float. And what do you mean with "inverse"?

  • 0 in reply to Clemens Ladisch
    Intellectual 490 points
    Hello
    sorry it was only float as u said it is big endian so i wrote it down as inverse.
  • 0
    Guru 74080 points

    Hi Harish!

    You could, for example, use a function like this:

    float hex_to_float( uint8_t * hex_array );

uint8_t float_in_hex[4] = { 0x43, 0xCf, 0x80, 0x00 };
float   float_from_hex;

...

void main( void )
{
  ...

  float_from_hex = hex_to_float( float_in_hex );

  ...
}

float hex_to_float( uint8_t * hex_array )
{
  float     result;
  uint8_t   counter;
  uint8_t * pointer;

  pointer = (uint8_t *) &result;

  for( counter = 0; counter < sizeof( float ); counter++ )
  {
    *(pointer + counter) = *(hex_array + sizeof( float ) - 1 - counter);
  }

  return result;
}

    Dennis

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