Signed-off-by: Emil Kronborg emil.kronborg@protonmail.com --- Changes in v4: - Changed license from GPL-2.0+ to GPL-2.0-or-later. Also, removed trailing colon. - Simplified the descriptions in the Synopsis section by removing the text following the '-'. - Reformulated the description of the invert subcommand to be more precise and correct. - %s/duty cycle/duty period to be consistent with pwm.h and to ensure correctness, as duty cycle is dimensionless and <duty_ns> is given in nanoseconds. - Moved the common parameters, pwm_dev_num and channel, to the bottom of the Description section, and added the remaining parameters. - Added a comma in the Examples section and used 'µs' instead of 'us'. - Rebased on top of master.

doc/usage/cmd/pwm.rst | 91 +++++++++++++++++++++++++++++++++++++++++++ doc/usage/index.rst | 1 + 2 files changed, 92 insertions(+) create mode 100644 doc/usage/cmd/pwm.rst

diff --git a/doc/usage/cmd/pwm.rst b/doc/usage/cmd/pwm.rst new file mode 100644 index 000000000000..522acb5afa33 --- /dev/null +++ b/doc/usage/cmd/pwm.rst @@ -0,0 +1,91 @@ +.. SPDX-License-Identifier: GPL-2.0-or-later + +.. index:: + single: pwm (command) + +pwm command +=========== + +Synopsis +-------- + +:: + + pwm invert <pwm_dev_num> <channel> <polarity> + pwm config <pwm_dev_num> <channel> <period_ns> <duty_ns> + pwm enable <pwm_dev_num> <channel> + pwm disable <pwm_dev_num> <channel> + + +Description +----------- + +The ``pwm`` command is used to access and configure PWM (Pulse Width Modulation) +signals. + +pwm invert +---------- + +* If the value of ``polarity`` is 0, the default polarity is used. +* If the value of ``polarity`` is 1, the polarity is inverted. + +pwm config +---------- + +Configure the period and duty period in nanoseconds. + +pwm enable +---------- + +Enable output on the configured device and channel. + +pwm disable +----------- + +Disable output on the configured device and channel. + +pwm_dev_num + Device number of the pulse width modulation device + +channel + Output channel of the PWM device + +polarity + * 0 - Use normal polarity + * 1 - Use inverted polarity + +duty_ns + Duty period in ns + +period_ns + Period time in ns + +Examples +-------- + +Configure device 0, channel 0 to 20 µs period and 14 µs (that is, 70%) duty period:: + + => pwm config 0 0 20000 14000 + +Enable output on the configured device and channel:: + + => pwm enable 0 0 + +Disable output on the configured device and channel:: + + => pwm disable 0 0 + +Invert the signal on the configured device and channel:: + + => pwm invert 0 0 1 + +Configuration +------------- + +The ``pwm`` command is only available if CONFIG_CMD_PWM=y. + +Return value +------------ + +If the command succeeds, the return value ``$?`` is set to 0. If an error occurs, the +return value ``$?`` is set to 1. diff --git a/doc/usage/index.rst b/doc/usage/index.rst index 1f6518b77c4b..6a218c46b4e4 100644 --- a/doc/usage/index.rst +++ b/doc/usage/index.rst @@ -93,6 +93,7 @@ Shell commands cmd/pinmux cmd/printenv cmd/pstore + cmd/pwm cmd/qfw cmd/read cmd/reset

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