FPGA time

[WatFin]

Hi,

I am using FPGA. I have while loop and inside the while loop I have case-structure with three cases. Everytime I choose some case I want the real time starting from 0. I need this time in case. Any idea how I can do it?

BR

[GerdW]

Hi WatFin,

Everytime I choose some case I want the real time starting from 0. I need this time in case. Any idea how I can do it?

Please explain "realtime"…

How is this problem related to FPGA?

3 simple steps:

1. Store the "time" in a shift register.

2. Wire through your case structure.

3. Set the value to zero when you think it is needed to do so…

[RavensFan]

What exactly do you mean by the "real time"?

You can set a separate timed while loop based off the 40 MHz clock and increments an indicator by 1 every iteration.  Read the indicator with a local variable and you'll have how many clock ticks have passed.

[WatFin]

Ok, what is real time? I hvae crio with 40 MHz and my loop sould work 2,48 kHz. The real-time I meant is the time we use to look at.

Could you show me basic example please?

[GerdW]

Hi WatFin,

put a (RealTime) wait in your loop set to 16129 ticks (of your default 40MHz clock) to have it iterate at ~2.48kHz…

The real-time I meant is the time we use to look at.

What are you "looking at"? ("Real-time")

[ikaiser]

---

@WatFin wrote:

real time

---

Just to clarify this thread: You so-to-say want to program a stop-watch that starts counting from 00:00:00 again every time you "press" the reset case. Is this the "real time" you mean?

[WatFin]

Yep that I want to do. The real-time is the clock time 0 1 2 3.. etc

[GerdW]

Hi WatFin,

you still can count clock cycles/ticks/iterations of your loop in the FPGA: just scale that number later on to your desired timebase of seconds (or ms)…

[Miryam16]

I am communicating with FPGA and RT. Code for Pulse generation (for 100KHz freq i.e. 10usec - 400 ticks)  is written in FPGA. But in RT using this FPGA code I'm not getting the same frequency. I am getting only 70 ticks instead of 400 ticks. Help me in solving this..

Thank You 

[Miryam16]

I am communicating with FPGA and RT. Code for Pulse generation (for 100KHz freq i.e. 10usec - 400 ticks)  is written in FPGA. But in RT using this FPGA code I'm not getting the same frequency. I am getting only 70 ticks instead of 400 ticks. Help me in solving this..

Thank You