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Pulse width measurement using T3IN ONLY!

Rup Kirby

Hi,
I had a design counting pulses from pin T3IN on GPT1-T3. The design now requires a pulse width to be measured instead of pulses being counted. Our hardware has access ONLY to T3IN, not CAPIN etc.

Problem: How can I set up GPT1/2 to measure the pulse width with only T3IN pin ?

Still getting to grips with capture/reload and interrupts, but reckon someone's done this before...!

Thanks for any advice.
Rup.

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  • 0 in reply to Sauli Porttila

    Thanks Sauli,
    I ended up coding a solution through GPT5, T3 and CAPREL as the manual shows, although this gives an interrupt on both edges, (unless I've misunderstood it)which as I said I don't want. The benefit is measurement of the mark and space values for safety checking, so that'll do.

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  • 0 in reply to Sauli Porttila

    Thanks Sauli,
    I ended up coding a solution through GPT5, T3 and CAPREL as the manual shows, although this gives an interrupt on both edges, (unless I've misunderstood it)which as I said I don't want. The benefit is measurement of the mark and space values for safety checking, so that'll do.

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