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fan: Clarify hardware_pwm and allow cycle_time to be set on software pwm

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Specify hardware pwm cycle times using the same method as software pwm
(in seconds, not clock ticks).  Allow the fan code to be configured
with an explicit cycle time even when using software pwm.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2018-01-29 12:54:06 -05:00
parent b7b216af7f
commit 21df21b7af
9 changed files with 46 additions and 51 deletions
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13
config/example.cfg
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@ -245,12 +245,13 @@ pin: ar9
# pin to be enabled for no more than half the time. This setting may
# be used to limit the total power output (over extended periods) to
# the fan. The default is 1.0.
#hard_pwm: 0
# Set this value to force hardware PWM instead of software PWM. Set
# to 1 to force a hardware PWM at the fastest rate; set to a higher
# number to force hardware PWM with the given cycle time in clock
# ticks. The default is 0 which enables software PWM with a cycle
# time of 10ms.
#cycle_time: 0.010
# The amount of time (in seconds) for each PWM power cycle to the
# fan. It is recommended this be 10 milliseconds or greater when
# using software based PWM. The default is 0.010 seconds.
#hardware_pwm: False
# Enable this to use hardware PWM instead of software PWM. The
# default is False.
#kick_start_time: 0.100
# Time (in seconds) to run the fan at full speed when first enabling
# it (helps get the fan spinning). The default is 0.100 seconds.