Timer 2 Tutorial

[Steve001]

Morning All

Is there a tutorial for setting and using timer 2 ?

have found a few posts on here and excel sheet etc but these not making sense

wanting to set on Eico modules

Steve

[medelec35]

Hi Steve,
Lest assume your are after a 1000Hz interrupt frequency.
1) Run flowchart and add the timer interrupt, select timer 2, then select properties.
2) Download the great timer app from here.
3) After extracting and running app Select More check box, just in case the exact frequency is not possible.
4) Enter the Oscillator speed, in the case 48000000
5) On flowchart interrupt properties select the Prescaler rate drop-down and see if maximum is 1:16 or 1:64 then select the maximum correct prescaler on the timer app.
In the case of ECIO 1:16.
6) Enter the target frequency of 1000 on the time app then select Do it!

7)The settings you should set timer 2 (I have highlighted) to are then displayed in the app Results window:

Timer2 tutoral..png

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Enter then within flowchart timer 2 properties:

Timer2 Int settings.png

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Hope this helps.

Martin

[Steve001]

cheers martin will have a go and see how i get on

Steve

[medelec35]

Your welcome Steve.
Out of curiosity, do you have an interrupt frequency in mind?

[Steve001]

not got a clue to be honest was going to try 1000Hz like you said and see if it works correctly - maybe not the correct way to go
wanting to generate an internal event at 20msec's

Steve

[medelec35]

wanting to generate an internal event at 20msec's

That would be one way to go.
All you do is place count variable that increments by one within the interrupt macro.
E.e

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Count = Count +1

then have a decision branch

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If Count  = 20 then count = 0 : Do whatever as another 20ms has elapsed since last here e.g. toggle an output.

How I derived 20 was 1000/50 = 20

The 1000 = interrupt frequency.
50 = 1/required time period = 1/20E-3

Martin

[Steve001]

Thanks martin

bit more clear now thank you for explaining

trying to finish some ongoing projects after erm cough months

Steve

[Steve001]

attached test file not behaving as expected runs at warp factor 10

not sure what is wrong was hoping A0 to be 50Hz and A5 to be 1Hz, have 506 and 102 admittedly not checked on a scope found my lead to be iffy
used Hz on my fluke

Steve

[medelec35]

One way is attached.
Hopefully only thrusters are engaged this time.

Martin

[Steve001]

cheers martin

simulation looking better will try on hardware tomorrow

what does this do ?

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(int_count1Hz = 0) || (int_count1Hz = 100)

Steve

[medelec35]

Hi Steve,
Mentioned

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||

in this post

Martin

[Steve001]

working thank you martin

Steve

[medelec35]

Hi Steve,
Glad its working for you.
Thanks for the update

Martin