Siemens SIMATIC IOT - Converting Real to Float

Maintaining and repairing the device
6.6 Configure IOT2050 SM
SIMATIC IOT2050
84 Operating Instructions, 03/2024, A5E39456816-AF
printf("Test failed: dq0 != di0\r\n");
break;
}
printf("Test ok\r\n");
}
close(dq0);
close(di0);
return ret;
}
6.6.2.3 Converting real to float
If the raw value of the module contains real type, convert these values to a float data type.
The following examples show converting real to float with C and Python.
Example: converts real to float with C
/**
* @brief Convert IEEE754 floating point.
*/
double real_to_float(uint32_t real)
{
int sign = real >> 31;
int exponent = ((real >> 23) & 0xFF) - 127;
uint32_t mantissa = real & 0x7FFFFF;
int power_count = -1;
double mantissa_int = 0;
for (int i = 0; i < 23; i++) {
mantissa_int += ((mantissa >> (22 - i)) & 1) * pow(2,
power_count);