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Diffstat (limited to 'testhal/KINETIS/MCHCK/PWM/README.md')
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1 files changed, 7 insertions, 0 deletions
diff --git a/testhal/KINETIS/MCHCK/PWM/README.md b/testhal/KINETIS/MCHCK/PWM/README.md new file mode 100644 index 0000000..6367722 --- /dev/null +++ b/testhal/KINETIS/MCHCK/PWM/README.md @@ -0,0 +1,7 @@ +# "Soft" PWM demo + +The PWM in this demo is "soft", meaning that it does use a hardware timer to run, but the output is not directly routed to a pin; a callback functions which turn a LED on and off are used instead. + +## Notes + +The brightness percentages it goes only up to 9900 (99%) instead of 10000 (100%); otherwise there is a noticeable blink in the top of the cycle. The reason is that the on/off callback functions take too long to execute for this kind of (relatively fast) timer. Likewise, '0' (0%) in the cycle actually means that the LED doesn't get turned off, because the channel notification function that turns the LED off doesn't get called. So in a setup like this one, '1' should be the minimum; although it does mean that the LED is never fully off. |