RPi 3B Aduio 3.5mm output

/********************************************************************** * RPi 3B Aduio 3.5mm output * 說明： * 看到樹莓派上一個3.5mm耳機口，歷來沒用過，折騰一下。 * * 2018-7-13 深圳 寶安西鄉 曾劍鋒 *********************************************************************/ 1、參考文檔： 1. 樹莓派如何選擇3.5mm耳機孔輸出聲音 https://jingyan.baidu.com/article/64d05a02220053de55f73bbc.html
 2、具體操做： 1. sudo raspi-config 2. 選擇流程： Raspberry Pi 3 Model B Rev 1.2 ┌─────────┤ Raspberry Pi Software Configuration Tool (raspi-config) ├──────────┐ │ │ │ 1 Change User Password           Change password for the current u │ │ 2 Network Options Configure network settings │ │ 3 Boot Options                   Configure options for start-up │ │ 4 Localisation Options Set up language and regional sett │ │ 5 Interfacing Options Configure connections to peripher │ │ 6 Overclock                      Configure overclocking for your P │ │ 7 Advanced Options               Configure advanced settings          <---│ │ 8 Update                         Update this tool to the latest ve │ │ 9 About raspi-config             Information about this configurat │ │ │ │ │ │ │ │ <Select>                     <Finish> │ │ │ └──────────────────────────────────────────────────────────────────────────────┘ ┌─────────┤ Raspberry Pi Software Configuration Tool (raspi-config) ├──────────┐ │ │ │ A1 Expand Filesystem Ensures that all of the SD card s │ │ A2 Overscan You may need to configure oversca │ │ A3 Memory Split Change the amount of memory made │ │ A4 Audio Force audio out through HDMI or 3    <---│ │ A5 Resolution Set a specific screen resolution │ │ A6 Pixel Doubling Enable/Disable 2x2 pixel mapping │ │ A7 GL Driver Enable/Disable experimental deskt │ │ │ │ │ │ │ │ │ │ │ │ <Select>                     <Back> │ │ │ └──────────────────────────────────────────────────────────────────────────────┘ ┌──────────────────────────────────────────────────────────┐ │ Choose the audio output │ │ │ │ 0 Auto │ │ 1 Force 3.5mm ('headphone') jack     <--- │ │ 2 Force HDMI │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ <Ok>                  <Cancel> │ │ │ └──────────────────────────────────────────────────────────┘ 3. speaker-test -t sine