how to implement this C code line: for ( int i = 0; i < G_ReadLen; i = i + 2 )

[nick7]

I want to implement the following C++ code in labview but i cannot make or loop to increase by two

int j = 0; for ( int i = 0; i < G_ReadLen; i = i + 2 )

{

BYTE AD_H = ByteArray.GetAt(i);

BYTE AD_L = ByteArray.GetAt(i + 1);

ValueArray[j] = AD_H << 8;

ValueArray[j] = ValueArray[j] + AD_L;

unsigned long Temp = ValueArray[j] >> 12;

Volts[j] = ((float)ValueArray[j]) * 0.0048875;Message.Format(

"%X , %X - %X, -- %d, +%.3f Volts", AD_H, AD_L, ValueArray[j], ValueArray[j], Volts[j]);

m_output_ep1i.InsertString(0,Message);

j = j + 1;

}

Thanks

[MikeS81]

Hi nick7,

you can use a for loop and connect the duration number to n, calcualte the i value you need inside the loop.

Mike

[sankah2k]

Hi nick7,

You could also use a while loop with the loop termination condition as i < G_Readlen and within the loop increment i by 2 and j by 1. You would need to pass the values of i and j to shift registers.

Hope this helps!

Cheers!

Sanka

[nick7 · Accepted solution]

Thanks a lot sanka problem solved I atached the solution

[TCPlomp]

Your code will not work.

You are replacing elements of an empty array. A no-op in LabVIEW.

Besides there is a lot easier way to do this:

I just hope this is not a homework assignment.

And for completeness sake here is Mikes solution (seen below):

 

Ton

Message Edited by TonP on 11-14-2008 12:55 PM

Message Edited by TonP on 11-14-2008 01:03 PM

[MikeS81]

Hi nick7,

in your case the attached code should also work. 

Mike

[craigc]

I love the way LabVIEW has tidied up all that C code (which took me a couple of minutes to get my head round). I then opened Mikes post (Which took up about 20% of the real estate) and recognised what was happening in about 0.5 secs! gotta love it! 🙂

[nick7]

Top my code is workig fine.

Here a few words on what I am doing:

PIC18F4550 micro board --> USB bulk in enpoind read delivers an array of 704 bytes (every two bytes contain a 10 bit voltage value)-->procces data to end up with 352 word (16bits) data.

HI byte XXXX XXDD  DDDD DDDD low byte (X :dont care bit)

[TCPlomp]

Most likely you do a 'String to U8' node conversion.

If you replace that with the Typecast I used you can directly convert from string to U16 array.

The fact that your code works is propably becuase you have a hidden constant to the Array shift register.

Good luck,

Ton