T527-----音频调试

一、audiocodec

audiocodec是具有数模转换功能的内置模块，可将音频数字信号转换成模拟信号发送出去，通常接耳机、扬声器等

1、音频流通路

播放流：

Playback ──> DACL ──> LINEOUTL ──> SPKPlayback ──> DACR ──> LINEOUTR ──> SPK

录音流：

MIC1 ──> ADC1 ──> CaptureMIC2 ──> ADC2 ──> CaptureMIC3 ──> ADC3 ──> Capture

AudioCodec 模块由 3 个设备树节点构建

（1）ASoC 层 codec: codec

（2）ASoC 层 platform: codec_plat

（3）ASoC 层 machine: codec_mach

2、设备树

/* audio dirver module -> audio codec */
&codec {tx-hub-en;rx-sync-en;dac-vol		= <63>;		/* default value:63 range:0->63 */dacl-vol	= <160>;	/* default value:160 range:0->255 */dacr-vol	= <160>;	/* default value:160 range:0->255 */adc1-vol	= <160>;	/* default value:160 range:0->255 */adc2-vol	= <160>;	/* default value:160 range:0->255 */adc3-vol	= <160>;	/* default value:160 range:0->255 */lineout-gain	= <31>;		/* default value:31 range:0->31 */hpout-gain	= <7>;		/* default value:7 range:0->7 */adc1-gain	= <31>;		/* default value:31 range:0->31 */adc2-gain	= <31>;		/* default value:31 range:0->31 */adc3-gain	= <31>;		/* default value:31 range:0->31 *//* to do: avcc-1.8 vdd33-3.3 cpvin-1.8 */avcc-external;avcc-supply	= <&reg_aldo4>;avcc-vol	= <1800000>;vdd-external;vdd-supply	= <&reg_cldo3>;vdd-vol		= <3300000>;cpvin-external;cpvin-supply	= <&reg_bldo3>;cpvin-vol	= <1800000>;pa-pin-max	= <1>;pa-pin-0	= <&r_pio PL 7 GPIO_ACTIVE_HIGH>;pa-pin-level-0	= <1>;pa-pin-msleep-0	= <0>;jack-det-level		= <0>;jack-det-threshold	= <8>;jack-det-debouce-time	= <250>;/* extcon                  = <&usb_power_supply>;* jack-swpin-mic-sel      = <&pio PH 8 GPIO_ACTIVE_HIGH>;* jack-swpin-hp-en        = <&pio PH 15 GPIO_ACTIVE_HIGH>;* jack-swpin-hp-sel       = <&pio PH 11 GPIO_ACTIVE_HIGH>;* jack-swmode-hp-off      = <0x00>;* jack-swmode-hp-usb      = <0x11>;* jack-swmode-hp-audio    = <0x10>;* jack-det-level          = <1>;* jack-det-threshold      = <8>;* jack-det-debouce-time   = <250>;*/status = "okay";
};&codec_plat {status = "okay";
};&codec_mach {soundcard-mach,jack-support = <1>;status = "okay";soundcard-mach,cpu {sound-dai = <&codec_plat>;};soundcard-mach,codec {sound-dai = <&codec>;};
};

3、驱动

bsp/drivers/sound/platform/snd_sunxi_aaudio.c:21:

#define DRV_NAME "sunxi-snd-plat-aaudio"

bsp/drivers/sound/platform/snd_sunxi_mach.c:78:static int asoc_simple_hw_params

mach 的时钟设置

static int asoc_simple_hw_params(struct snd_pcm_substream *substream,struct snd_pcm_hw_params *params)
{switch (params_rate(params)) {case 8000:case 12000:case 16000:case 24000:case 32000:case 48000:case 64000:case 96000:case 192000:freq_point = 24576000;

bsp/drivers/sound/platform/snd_sun55iw3_codec.c:695: SOC_ENUM_EXT("ADC HPF0 Mode", sunxi_adchpf0_sta_enum, sunxi_codec_get_dap_status,

时钟设置 sunxi_codec_dai_set_pll

static int snd_sunxi_clk_rate(struct sunxi_codec_clk *clk, int stream,unsigned int freq_in, unsigned int freq_out)
{SND_LOG_DEBUG("\n");if (stream  == SNDRV_PCM_STREAM_PLAYBACK) {if (freq_in % 24576000 == 0) {/* If you want to use clk_pll_audio0_4x, must set it 1083801600Hz */if (clk_set_parent(clk->clk_audio_dac, clk->clk_pll_audio0_4x)) {SND_LOG_ERR("set dac parent clk failed\n");return -EINVAL;}if (clk_set_rate(clk->clk_pll_audio0_4x, 1083801600)) {SND_LOG_ERR("set clk_pll_audio0_4x rate failed\n");return -EINVAL;}} else {if (clk_set_parent(clk->clk_audio_dac, clk->clk_pll_audio1_div5)) {SND_LOG_ERR("set dac parent clk failed\n");return -EINVAL;}}if (clk_set_rate(clk->clk_audio_dac, freq_out)) {SND_LOG_ERR("set clk_audio_dac rate failed, rate: %u\n", freq_out);return -EINVAL;}}}static int sunxi_codec_dai_hw_params(struct snd_pcm_substream *substream,struct snd_pcm_hw_params *params,struct snd_soc_dai *dai)
{/* Set rate */for (i = 0; i < ARRAY_SIZE(sunxi_sample_rate_conv); i++) {if (sunxi_sample_rate_conv[i].samplerate == params_rate(params)) {if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {regmap_update_bits(regmap, SUNXI_DAC_FIFO_CTL, 0x7 << DAC_FS,sunxi_sample_rate_conv[i].rate_bit << DAC_FS);} else {if (sunxi_sample_rate_conv[i].samplerate > 48000)return -EINVAL;regmap_update_bits(regmap, SUNXI_ADC_FIFO_CTL, 0x7 << ADC_FS,sunxi_sample_rate_conv[i].rate_bit << ADC_FS);}}}}static const struct snd_soc_dai_ops sunxi_codec_dai_ops = {.startup	= sunxi_codec_dai_startup,.hw_params	= sunxi_codec_dai_hw_params,.set_pll	= sunxi_codec_dai_set_pll,.prepare	= sunxi_codec_dai_prepare,.trigger	= sunxi_codec_dai_trigger,.shutdown	= sunxi_codec_dai_shutdown,
};

二、AUDIO 音频测试

音频流通路：

播放流：

Playback ──> DACL ──> LINEOUTL ──> SPKPlayback ──> DACR ──> LINEOUTR ──> SPK

录音流：

MIC1 ──> ADC1 ──> CaptureMIC2 ──> ADC2 ──> CaptureMIC3 ──> ADC3 ──> Capture

音频设备：

tinymix查看信息

如何使用 tinymix 更改设置

要更改某个控制项的值，可以使用以下命令格式：

tinymix [control id] [value to set]

例如，如果你想把 MIC1 Switch 打开，可以执行：

tinymix 23 1

同理，如果你想调整音量或增益，可以使用类似的方法：

tinymix 12 100 # 设置 DAC Volume 为 100tinymix 18 40 # 设置 LINEOUT Gain 为 40

1.播放音乐

1.1 aplay 播放wav格式音乐

#打开SPK switch

tinymix 29 1

#默认声卡播放

aplay /usr/share/alsa/syfs-chenhuilin.wav

1.2 ffplay 播放MP3格式音乐

ffplay -nodisp /usr/share/alsa/wuyeutian-xingkong.mp3

1.3 music 音量控制

#amixer 控制music音量，范围0~255， 255声音最大

amixer set 'PCM music volume' 90

1.4 FM 音量控制

#x为音量值，范围 0~100

#ep：设置音量为50

tinymix -D 4 'DSP2_FM_FaderLR02 Volume' 50

#查看当前音量值

tinymix -D 4 'DSP2_FM_FaderLR02 Volume'

2 、录音

#alsa指定声卡录音， dsnoop 录音，可多路同时录音，录制为wav格式

2.1 打开 MIC 输入

tinymix -D 0 23 1tinymix -D 0 24 1tinymix -D 0 25 1

#ADC HPF0 Mode

tinymix -D 0 5 1

#ADC1 Volume

tinymix -D 0 15 150arecord -r 44100 -f S16_LE -c2 /mnt/UDISK/record.wavarecord -r 44100 -f S16_LE -c2 /mnt/UDISK/record.wav

2.2 播放录音

aplay /media/record.wav

注意录音时双声道，播放时接左右声道的喇叭应该会同时出声！！否则可能是mic或功放工作异常。

MIC录音无声音，录音时测量MBIAS电压为1.8V左右，正常

查看原理图，MIC经过了FM1388模块，要先调试FM1388。如果是直连到CPU，录音功能测试正常。FM1388模块调试内容后续更新。