float string to decimal

[Mobile]

Hello,

I am in internship and I have a problem with my system.

I send information between a PCB to my computer. I send in my frame, a float in string format and I would like to make the conversion in LabView to show the good value.

For example, there are something like that in my buffer : 3E94C2DC and I would like to convert that in decimal format.

Could you help me please.

Thanks in advanced.

Quentin

[Henrik_Volkers · Accepted solution]

Not clear to me:

Source:  '3E94C2DC' in what format? 2 words in Hex , or 8 bytes from serial coded in ASCII?

Output format:   single float?(0,290549)

[Mobile]

It is 8 bytes from serial coded in ASCII. And I would like to convert this 8 bytes of my float string to decimal number. Then I could show the real value in LabView.

My output that I would like to have is around 0.30

[Greg_AX]

Hi Quentine

Maybe you can use Hexadecimal String To Number Function (http://zone.ni.com/reference/en-XX/help/371361G-01/glang/hex_string_to_number). I attached an example.

Regards

Greg

[Henrik_Volkers]

Did you see the number in my question ??

What LV version do you have ?

Just save and paste the snippet from my previous post 🙂

However, here as a vi in LV2009

[Greg_AX]

Sorry Henrik,

When I started creating post, there was no answer yet. After I send my post I saw your post. Maybe next time I will be faster 😉

regards

Greg

[Mobile]

I am sure it is not clear taht I have.

I have a float number, I send the float number in my buffer with C code with printf instruction like that :

printf ("%x", numberthatIhave);

In labview I read my buffer, so it is a string format. And I would like to convert the message (hex value in string format) to a decimal number to show the number.

But I do not know how I can do that...

[Henrik_Volkers]

The snippet /vi should solve your problem.

The string is converted to a binary 32bit respensentation and then converted to a single float (also 32bit) 

To check the result it would have been usefull to post an exact input / output pair 😉 

Have fun 🙂

[Mobile]

When I make the test with you solution, I have 1.049. Whereas I would like to have 0.30

[Henrik_Volkers]

Do you see the minor but important difference ?

I used the typecast to convert U32 to SGL 😉

And you get 0,290549

(U32 displayed in Hex)