[问答]

PCM3168A SAI音频输入/输出无法同时工作怎么解决？

问答对人有帮助，内容完整，我也想知道答案 0 我可以录制音频，但无法播放音频。我补充说”FSL，SAI-异步" to the sai0 node, but that didn't seem to allow both to work at the same time. If I probe the ADC lines, I never see a BCLK or LRCLK signals when the cpu is the master, but I do see signals when the 编解码器 is the master. What am I doing wrong? Here's my device tree below: 播放正常，捕获不工作： sound_card: sound-card { compatible = "simple-audio-card"; simple-audio-card,name = "PCM3168A"; simple-audio-card,aux-devs = <&>; simple-audio-card,widgets = "Speaker", "Channel1out", "Speaker", "Channel2out", "Speaker", "Channel3out", "Speaker", "Channel4out", "Speaker", "Channel5out", "Speaker", "Channel6out", "Speaker", "Channel7out", "Speaker", "Channel8out", "Microphone", "Channel1in", "Microphone", "Channel2in", "Line", "Channel3in", "Line", "Channel4in", "Microphone", "Channel5in", "Microphone", "Channel6in"; simple-audio-card,routing = "Channel1out", "AOUT1L", "Channel2out", "AOUT1R", "Channel3out", "AOUT2L", "Channel4out", "AOUT2R", "Channel5out", "AOUT3L", "Channel6out", "AOUT3R", "Channel7out", "AOUT4L", "Channel8out", "AOUT4R", "Channel1in", "AIN1L", "Channel2in", "AIN1R", "Channel3in", "AIN2L", "Channel4in", "AIN2R", "Channel5in", "AIN3L", "Channel6in", "AIN3R"; simple-audio-card,dai-link@0 { format = "left_j"; bitclock-master = <&snd_cpu>; frame-master = <&snd_cpu>; mclk-fs = <512>; snd_cpu: cpu { sound-dai = <&sai0>; clocks = <&mclkout0_lpcg 0>; dai-tdm-slot-num = <8>; dai-tdm-slot-width = <32>; }; pcm3168_dac: 编解码器 { sound-dai = <&pcm3168a 0>; dai-tdm-slot-num = <8>; dai-tdm-slot-width = <32>; }; }; simple-audio-card,dai-link@1 { format = "left_j"; bitclock-master = <&mic_cpu>; frame-master = <&mic_cpu>; mclk-fs = <512>; mic_cpu: cpu { sound-dai = <&sai0>; clocks = <&mclkout0_lpcg 0>; dai-tdm-slot-num = <8>; dai-tdm-slot-width = <32>; }; pcm3168_adc: 编解码器 { sound-dai = <&pcm3168a 1>; dai-tdm-slot-num = <8>; dai-tdm-slot-width = <32>; }; };}; Capture Working（捕获工作）和 Playback （播放不工作）： simple-audio-card,dai-link@0 { format = "left_j"; bitclock-master = <&snd_cpu>; frame-master = <&snd_cpu>; mclk-fs = <512>; snd_cpu: cpu { sound-dai = <&sai0>; clocks = <&mclkout0_lpcg 0>; dai-tdm-slot-num = <8>; dai-tdm-slot-width = <32>; }; pcm3168_dac: 编解码器 { sound-dai = <&pcm3168a 0>; dai-tdm-slot-num = <8>; dai-tdm-slot-width = <32>; };};simple-audio-card,dai-link@1 { format = "left_j"; bitclock-master = <&pcm3168_adc>; frame-master = <&pcm3168_adc>; mclk-fs = <512>; mic_cpu: cpu { sound-dai = <&sai0>; clocks = <&mclkout0_lpcg 0>; dai-tdm-slot-num = <8>; dai-tdm-slot-width = <32>; }; pcm3168_adc: 编解码器 { sound-dai = <&pcm3168a 1>; dai-tdm-slot-num = <8>; dai-tdm-slot-width = <32>; };}; SAI0 节点： &sai0 { #sound-dai-cells = <0>; assigned-clocks = <&clk IMX_SC_R_AUDIO_PLL_0 IMX_SC_PM_CLK_PLL>, <&clk IMX_SC_R_AUDIO_PLL_0 IMX_SC_PM_CLK_SLV_BUS>, <&clk IMX_SC_R_AUDIO_PLL_0 IMX_SC_PM_CLK_MST_BUS>, <&sai0_lpcg 0>; assigned-clock-rates = <786432000>, <49152000>, <12288000>, <49152000>; pinctrl-names = "default"; pinctrl-0 = <&pinctrl_sai0>; FSL，SAI-异步; status = "okay";};pinctrl_sai0: sai0grp { fsl,pins = < IMX8QM_SPI0_CS1_AUD_SAI0_TXC 0x0600004c // BCKDA IMX8QM_SPI2_CS1_AUD_SAI0_TXFS 0x0600004c // LRCKDA IMX8QM_SPI0_SDI_AUD_SAI0_RXD 0x0600004c // DOUT1 IMX8QM_SPI0_SDO_AUD_SAI0_TXD 0x0600006c // DIN1 IMX8QM_SPI0_SCK_AUD_SAI0_RXC 0x0600004c // BCKAD IMX8QM_SPI0_CS0_AUD_SAI0_RXFS 0x0600004c // LRCKAD >;}; I2C 节点： // Audio Codec (8-channel output, 6-channel input)pcm3168a: audio-编解码器@44 { compatible = "ti,pcm3168a"; reg = <0x44>; reset-gpios = <&lsio_gpio4 24 GPIO_ACTIVE_LOW>; clocks = <&mclkout0_lpcg 0>; clock-names = "scki"; clock-frequency = <24576000>; assigned-clocks = <&clk IMX_SC_R_AUDIO_PLL_0 IMX_SC_PM_CLK_PLL>, <&clk IMX_SC_R_AUDIO_PLL_0 IMX_SC_PM_CLK_SLV_BUS>, <&clk IMX_SC_R_AUDIO_PLL_0 IMX_SC_PM_CLK_MST_BUS>, <&mclkout0_lpcg 0>; assigned-clock-rates = <786432000>, <49152000>, <24576000>, <49152000>; #sound-dai-cells = <1>; VDD1-supply = <®_3v3>; VDD2-supply = <®_3v3>; VCCAD1-supply = <®_5v0>; VCCAD2-supply = <®_5v0>; VCCDA1-supply = <®_5v0>; VCCDA2-supply = <®_5v0>; pinctrl-names = "default"; pinctrl-0 = <&pinctrl_编解码器_clk &pinctrl_audio_reset>;}; 0 本主题由 Harmony技术专家于 2025-4-11 16:23 审核通过
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答案对人有帮助，有参考价值 0 针对PCM3168A SAI音频输入/输出无法同时工作的问题，以下是逐步解决方案： 1. 主从模式冲突排查问题核心：当CPU作为主设备（Master）时，编解码器（PCM3168A）的ADC无法检测到BCLK/LRCLK信号，但编解码器作为主设备时正常。这表明主从模式配置冲突。解决方案：统一主从模式：确保SAI接口在同一时间只有一个主设备。若编解码器作为主设备，则CPU需配置为从设备；反之同理。设备树调整：在`sound-card`节点中，明确指定`frame-master`和`bitclock-master`，确保收发方向的主从一致性。 2. 设备树配置修正修改设备树中的`simple-audio-card`配置，明确主从角色。例如： sound_card: sound-card { compatible = "simple-audio-card"; status = "okay"; // Playback配置：编解码器为主，CPU为从 simple-audio-card,link@0 { format = "i2s"; cpu { sound-dai = <&sai0>; dai-tdm-slot-num = <2>; // CPU作为从设备 dai-format = "i2s"; }; codec { sound-dai = <&pcm3168a 0>; // 编解码器作为主设备 frame-master = <&pcm3168a>; bitclock-master = <&pcm3168a>; }; }; // Capture配置：编解码器为主，CPU为从 simple-audio-card,link@1 { format = "i2s"; cpu { sound-dai = <&sai0>; dai-tdm-slot-num = <2>; // CPU作为从设备 dai-format = "i2s"; }; codec { sound-dai = <&pcm3168a 1>; // 编解码器作为主设备 frame-master = <&pcm3168a>; bitclock-master = <&pcm3168a>; }; }; }; 3. 异步模式与时钟配置启用异步时钟：在SAI节点中添加`fsl,sai-asynchronous`允许收发使用独立时钟，但需确保时钟源正确。检查时钟树：确认SAI的时钟父源（如音频PLL）和分频系数是否支持所需采样率。例如： `&sai0 { compatible = "fsl,imx-sai"; pinctrl-names = "default"; pinctrl-0 = <&pinctrl_sai0>; fsl,sai-asynchronous; // 启用异步模式 assigned-clocks = <&clk IMX8MM_CLK_SAI1>; assigned-clock-parents = <&clk IMX8MM_AUDIO_PLL1_OUT>; assigned-clock-rates = <24576000>; // 根据采样率调整 status = "okay"; };` 4. 编解码器寄存器配置验证硬件模式设置：确认PCM3168A的`MODE`引脚和寄存器配置，确保其主从模式与设备树一致。若编解码器为主设备，检查其是否输出BCLK/LRCLK到CPU。若编解码器为从设备，检查其是否接收来自CPU的时钟信号。 5. 信号检测与硬件排查示波器检测：当CPU为主设备时，检查SAI的BCLK/LRCLK引脚是否有信号输出。确认引脚复用（pinctrl）配置正确，时钟引脚未被其他功能占用。 DMA与中断：确保Playback和Capture的DMA通道独立且无冲突。 6. 其他潜在问题时隙对齐：检查`dai-tdm-slot-num`和`dai-tdm-slot-width`是否与编解码器配置匹配。电源管理：确认编解码器的供电和复位信号稳定，避免部分电路未正常工作。通过以上步骤调整后，重新编译设备树并加载测试。若问题依旧，建议结合内核日志（`dmesg`）和示波器信号分析进一步排查时钟与数据传输问题。

2025-4-16 18:01:33 评论举报李超