TMS320F28379D: Cast 32-bit to a Float

Zvi Traiger1

Part Number: TMS320F28379D

Hello,

I have a simple code that reads some data from UART and converts it to float, and I've encountered a problem:

uint32_t temp1;
float vel;

vel = (float) temp1;        // ERROR: the hexadecimal data in temp1 and vel is not the same !!

memcpy((void*)&vel, (void*)&temp1, 2);           // OK!

How come casting to float is not working as expected?

over 5 years ago

0 Lori Heustess over 5 years ago

TI__Guru* 91125 points

A floating point number is stored in IEEE 754 format, so the hex won't match a unsigned integer.

https://en.wikipedia.org/wiki/IEEE_754

Regards

Lori

C2000™︎ microcontrollers

C2000 microcontrollers forum

TMS320F28379D: Cast 32-bit to a Float