Conversion from hex to IEEE-754 float
I want to convert hexidecimal bytes from a serial device protocol to floating point
for example: 0x40 0xb0 0x00 0x00 represents 5.5
char msg[4];
float *f;
msg[0]=0x40;
msg[1]=0xB0;
msg[2]=0x00;
msg[3]=0x00;
f=(float*)msg doesn't seem to work
does anyone know how to do this?
The reason it doesn't simply work good that way, is because floats are not stored in memory the same way that regular variables are. They have a skewed storage method. If they didn't, you could simply do:
You can try it, but I doubt you'll get the results you want.Code:union u { unsigned char c[4]; float f; };
Quzah.
Hope is the first step on the road to disappointment.
>msg[0]=0x40;
>msg[1]=0xB0;
>msg[2]=0x00;
>msg[3]=0x00;
For a windows machine, should be:
msg[3]=0x40;
msg[2]=0xB0;
msg[1]=0x00;
msg[0]=0x00;
****Originally posted by quzah
The reason it doesn't simply work good that way, is because floats are not stored in memory the same way that regular variables are. They have a skewed storage method. If they didn't, you could simply do:
You can try it, but I doubt you'll get the results you want.Code:union u { unsigned char c[4]; float f; };
Quzah.
Quzah, with the bytes in reverse order your solution works!!
Thank you!.
