.. SPDX-License-Identifier: GPL-2.0+ .. Copyright 2022, Heinrich Schuchardt sound command ============= Synopsis -------- :: sound init sound play [len [freq]] Description ----------- The *sound* command is used to play a beep sound. sound init initializes the sound driver. sound play plays a square wave sound. It does not depend on previously calling *sound init*. len duration of the sound in ms, defaults to 1000 ms freq frequency of the sound in Hz, defaults to 400 Hz Configuration ------------- The sound command is enabled by CONFIG_CMD_SOUND=y. Return value ------------ The return value $? is 0 (true) if the command succeeds, 1 (false) otherwise.