Read the problem section directly unless you need more info.
Background:
I need to control the speed and direction of 24 stepper motors simultaneously.The values of Speed and direction (how long it rotates in the same dir) should be randomized within a given limit.
Hardware:
LABview > PCI7813R (FPGA) > SCB68 > Steper drive P70530 > stepper motor.
(I simulate the FPGA card as of now)
Application:
Active turbulance generator (ATG)
Every input needs to be randomized between a given value.
For this application Random => better.
Other info:
I need to send two digital pulses to each motor viz. - Step and Dir.
Each motor has to rotate at different speed and direction chosen randomly.
The FPGA vi needs 48 inputs. The input is the value of the frequency of a wave generator. (full control possible with only that)
The main Vi gets its randomized input from a subVI. this value is stored in a shared variable and used inside while loops.
Problem:
I need to choose one of the methods below to control all the stepper motors.
Which one of the two algorithm is better?
1. I have 24 while loops for each signal(dir and step) to FPGA VI. Each connects to one input of the FPGA vi. inside the while loop i have a time delay connected to a random number generator.
So after a random time the value from the sub vi at that instant will be used as the signal to be sent to the fpga vi. so I send data to each i/p by a random time delay.
2. I have 2 loop that polls 24 inputs each and updates the value from the sub VI in a systematic way.
*polling = updating the inputs one by one in a seqential manner;
Other questions:
With the first method the computer processor usage went to full. so I felt it needs more processing power. I am wondering if a change in algorithm is necessary. Is there a possibility that 100% CPU usage is due to the use of simulation n not the real card?
Attachments:
1. Comp_Main.vi - the vi in wihich i need to implement this algorthim
I have done only for dir. I am yet to do the same for step.
