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docs(cubie/a5e): add audio interface clarification note#1777

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docs(cubie/a5e): add audio interface clarification note#1777
tangzz-radxa wants to merge 1 commit into
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tangzz-radxa:support/cubie-a5e-audio-note

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GitHub Discussion #1776 - 用户在音频使用页面提问:Cubie A5E 没有标注耳机接口,询问是否可以通过 40 Pin GPIO 接模拟音频。

改动说明

共享音频模板列出「蓝牙音频 > 耳机 > HDMI 音频」作为默认优先级,但 Cubie A5E 主板没有物理 3.5mm 耳机接口。此次添加说明注释:

  • 板载无耳机插孔
  • alsamixer 中「耳机」选项仅在检测到 USB 音频设备时出现
  • 40 Pin GPIO 提供 I2S2 数字音频接口(需外接 DAC 芯片转模拟)

中英文版本同步更新。

关联 Discussion

#1776

Source: GitHub Discussion radxa-docs#1776 - user question about analog audio via 40-pin GPIO on Cubie A5E.

The shared audio template lists 'Bluetooth Audio > Headphones > HDMI Audio' as the default priority, but the Cubie A5E board has no physical 3.5mm headphone jack. This note clarifies:
- No onboard headphone jack exists
- 'Headphones' entry in alsamixer only appears when USB audio device is connected
- I2S2 via 40-pin GPIO is available for digital audio output (requires external DAC)

Both Chinese (docs/) and English (i18n/en/) versions updated.
@tangzz-radxa tangzz-radxa requested a review from a team as a code owner May 26, 2026 11:41
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