0261d7d96d
IDLEOUT presence in PWM means that there are 3 sources from which PWM pin can be driven: - GPIO setting when PWM peripheral is disabled. - IDLEOUT setting when PWM is enabled. - PWM Sequence when it is in use. IDLEOUT setting cannot be changed after enabling PWM so it is configured to the initial state of the pin. It means that if duty cycle is 100%, GPIO output is set to 1 but initial pin state was 0 (IDLEOUT setting) there will be a glitch between disabling a PWM sequence and disabling a PWM peripheral. By default, PWM driver tries to disable PWM peripheral if all channels are 0% or 100% duty cycle to safe power. When IDLEOUT feature is present there will be a short glitch on channels with 100% duty cycle. In order to avoid that CONFIG_PWM_NRFX_NO_GLITCH_DUTY_100 option is added (enabled by default). When option is enabled 100% duty cycle is achieved by PWM sequence and not by driving a GPIO pin. It will consume more power in cases where all channels are 0% or 100% with at least one channel set to 100% duty cycle. Signed-off-by: Krzysztof Chruściński <krzysztof.chruscinski@nordicsemi.no>
33 lines
1.2 KiB
Plaintext
33 lines
1.2 KiB
Plaintext
# Copyright (c) 2018, Cue Health Inc
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# SPDX-License-Identifier: Apache-2.0
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config PWM_NRFX
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bool "nRF PWM nrfx driver"
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default y
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depends on DT_HAS_NORDIC_NRF_PWM_ENABLED
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select NRFX_PWM0 if HAS_HW_NRF_PWM0
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select NRFX_PWM1 if HAS_HW_NRF_PWM1
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select NRFX_PWM2 if HAS_HW_NRF_PWM2
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select NRFX_PWM3 if HAS_HW_NRF_PWM3
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select NRFX_PWM20 if HAS_HW_NRF_PWM20
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select NRFX_PWM21 if HAS_HW_NRF_PWM21
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select NRFX_PWM22 if HAS_HW_NRF_PWM22
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select NRFX_PWM120 if HAS_HW_NRF_PWM120
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select NRFX_PWM130 if HAS_HW_NRF_PWM130
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select NRFX_PWM131 if HAS_HW_NRF_PWM131
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select NRFX_PWM132 if HAS_HW_NRF_PWM132
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select NRFX_PWM133 if HAS_HW_NRF_PWM133
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select PINCTRL
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help
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Enable support for nrfx Hardware PWM driver for nRF52 MCU series.
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config PWM_NRFX_NO_GLITCH_DUTY_100
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bool "No glitches when using 100% duty"
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depends on $(dt_compat_any_has_prop,$(DT_COMPAT_NORDIC_NRF_PWM),idleout-supported,True)
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default y
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help
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Due to how IDLEOUT feature in PWM works it is possible to see a glitch on a channel
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with 100% duty cycle when all other channels switches to 0% or 100%. Enabling this
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option ensures that there are no glitches but it also means that 100% duty cycle
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on any channels requires PWM peripheral to be active.
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