| .. SPDX-License-Identifier: GPL-2.0+ | |
| .. Copyright 2022, Heinrich Schuchardt <xypron.glpk@gmx.de> | |
| sound command | |
| ============= | |
| Synopsis | |
| -------- | |
| :: | |
| sound init | |
| sound play [[len freq] ...] [len [freq]] | |
| Description | |
| ----------- | |
| The *sound* command is used to play one or multiple beep sounds. | |
| 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 | |
| Examples | |
| -------- | |
| Beep at 400 Hz for 1000 ms:: | |
| sound play | |
| Beep at 400 Hz for 600 ms:: | |
| sound play 600 | |
| Beep at 500 Hz for 600 ms:: | |
| sound play 600 500 | |
| Play melody:: | |
| sound play 500 1047 500 880 500 0 500 1047 500 880 500 0 500 784 500 698 500 784 1000 698 | |
| 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. |