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internals.md: Add doc to explain pwm internally is all in us

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Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>
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Brendan Le Foll
2015-08-27 17:03:39 +01:00
parent 0256b680f1
commit e9a7415ee7
1 changed files with 5 additions and 0 deletions
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docs/internals.md
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@@ -114,6 +114,11 @@ set the pinmapper correctly for uart to work on some platforms.
### pwm ###
Internally everything with PWM in mraa is in microseconds because that's what
the linux kernel uses and is probably all the granularity we'll ever
need/achieve with the kind of hardware we're targetting. Board configuration
pwm max/min values are always set in microseconds.
### aio ###
AIO pins are numbered after GPIO pins. This means that on Arduino style boards