Single variable in subroutine

[Boguslaw]

Hi
I want to use SUBroutine with single values, but compiler reports error, why ?

Error: GCASM: Symbol [SFR]SYSMULTSUBSINGLE has not been defined. Inspect ASM file to determine error at CALL SYSMULTSUBSINGLE Hexfile address(see lst file): 000148

[Anobium]

Hello,
Post your program so I see the error. Please attach to your post.

[Boguslaw]

Variables Kp ,Ku,Ki ,Kd ,Setpoint ,Integral , Previouserror,Pot1 are global

sub Autotune
dim petla as word
  '  Setpoint = 800                                          
  '  Integral = 0
  '  Previouserror = 0
  '  Ku = 0
  '  Tu = 0
    For petla = 1 To 100 Step 1
        Output1 = 0
       PWM1_Duty = Output1
        Pot1 = ReadAD10(AN0)                                    

        Wait 100 us
        Tu = Tu + 1
          Setpoint_tmp = Setpoint + 10
        If Pot1 > Setpoint_tmp Then Exit For
    Next
kp = petla
    Kp = 0.6 * Ku
    Ki = 2 * Kp / Tu
    Kd = Kp * Tu / 8
End Sub

[Anobium]

This not the complete program, so, I cannot try to compile.

But, Kp = 0.6 * Ku is probably the issue. You need to factorise to use integer calculations.

[Boguslaw]

Attached code. I have one problem yet, PWM don't work can you see why ?
I noticed that the problem is not in SUB, when I remove SUB the error is still there.
, problem is caused by this line: Output1 = Kp * Error + Ki * Integral + Kd * Derivative
I changed all variables to single and without effect.
How to perform mathematical operations with single variables?

[Anobium]

I would look at the demos for Q71.

C:\GCstudio\gcbasic\demos\Vendor_Boards\Great_Cow_Basic_Demo_Board\18f26q71_chiprange_demonstrations

There are many PWM demos. Work out which one you need to use - i would recommend PWM/CPP as this is the easy one. There more demos on 16bit demos in the demo folders.

---

Regarding singles ( we called the Floats) , see https://sourceforge.net/p/gcbasic/discussion/596084/thread/b867317011/
Use factorised integers. They work a lot lot faster and they work.

[Boguslaw]

if I use specific numbers, I understand, but when I multiply two single variables,
single1=single2*single3 s(ingles 2 and 3 calculated in another part of the program)
I don't know how to solve it.

[Anobium]

Read the https://sourceforge.net/p/gcbasic/discussion/596084/thread/b867317011/ post?

Remove the SINGLES from you program and use factorised integers.

Then, the maths will work.