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drivers: pwm: clarify behavior

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As written the specification when both period and pulse are zero is
inconsistent: allowed behavior would be to drive the pin at constant
active or constant inactive, depending on which condition was checked
first.

Clarify that driving constant active level requres a non-zero pulse
equal to period.

Signed-off-by: Peter Bigot <peter.bigot@nordicsemi.no>
This commit is contained in:
Peter Bigot 2020-05-25 08:39:59 -05:00 • committed by Carles Cufí
commit a4337bde28
1 changed files with 3 additions and 3 deletions
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6
include/drivers/pwm.h
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@ -60,10 +60,10 @@ __subsystem struct pwm_driver_api {
/** /**
* @brief Set the period and pulse width for a single PWM output. * @brief Set the period and pulse width for a single PWM output.
* *
* Passing 0 to the @p pulse will cause the pin to be driven to a constant * Passing 0 as @p pulse will cause the pin to be driven to a constant
* inactive level. * inactive level.
* Passing a @p pulse equal @p period will cause the pin to be driven * Passing a non-zero @p pulse equal to @p period will cause the pin
* to a constant active level. * to be driven to a constant active level.
* *
* @param dev Pointer to the device structure for the driver instance. * @param dev Pointer to the device structure for the driver instance.
* @param pwm PWM pin. * @param pwm PWM pin.