Timeline for Measuring 0 - 1MHz ( 0.25Hz resolution) Squarewave using an MCU
Current License: CC BY-SA 2.5
5 events
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| Jun 4, 2010 at 18:25 | comment | added | vicatcu | @timrorr, wow yes that is way smarter way of doing it :) I posted updated AVR-GCC code in a separate post. Care to take a look and see what you think? | |
| Jun 4, 2010 at 4:57 | comment | added | timrorr | Measuring a frequency using the period works quite well with slow waveforms (you're relying on the internal timer being much quicker than the external signal) but quickly hits a limit as the input signal frequency increases. Basically, as you've found, the time spent inside the timer capture interrupt becomes dominant; there is no time left for any other parts of the code to run. While I'm not that familiar with the ATTiny a quick look at the datasheet shows that timer/counter1 does support external event counting so let the hardware handle the counting. | |
| Jun 2, 2010 at 20:59 | history | edited | vicatcu | CC BY-SA 2.5 |
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| Jun 1, 2010 at 18:57 | history | edited | vicatcu | CC BY-SA 2.5 |
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| Jun 1, 2010 at 18:38 | history | answered | vicatcu | CC BY-SA 2.5 |