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11da3403e9
For nearly all commands in U-Boot the '?' variable is handled the same way with 0 meaning success, 1 meaning any failure. Explain this in the general rules section of the cmdline documentation (with a link to a counter example) and then remove the redundant wording from most commands. We retain a section about the return value in a number of places where we are doing something such as always returning a specific value or we have useful additional information to go along with the normal return codes. Signed-off-by: Tom Rini <trini@konsulko.com> Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
59 lines
964 B
ReStructuredText
59 lines
964 B
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0+
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.. Copyright 2022, Heinrich Schuchardt <xypron.glpk@gmx.de>
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.. index::
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single: sound (command)
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sound command
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=============
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Synopsis
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--------
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::
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sound init
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sound play [[len freq] ...] [len [freq]]
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Description
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-----------
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The *sound* command is used to play one or multiple beep sounds.
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sound init
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initializes the sound driver.
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sound play
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plays a square wave sound. It does not depend on previously calling
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*sound init*.
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len
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duration of the sound in ms, defaults to 1000 ms
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freq
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frequency of the sound in Hz, defaults to 400 Hz
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Examples
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--------
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Beep at 400 Hz for 1000 ms::
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sound play
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Beep at 400 Hz for 600 ms::
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sound play 600
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Beep at 500 Hz for 600 ms::
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sound play 600 500
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Play melody::
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sound play 500 1047 500 880 500 0 500 1047 500 880 500 0 500 784 500 698 500 784 1000 698
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Configuration
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-------------
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The sound command is enabled by CONFIG_CMD_SOUND=y.
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