rk3399声卡调试可以通过查看 cat /proc/asound/cards 找到已经在dts中配置好的声卡
一、声卡配置项
正常情况下，如果声卡是通过 i2c 配置参数的，需要在设备树里配置 i2c 例如：
&i2c1 {
status = "okay";
i2c-scl-rising-
time-ns = <140>;
i2c-scl-falling-time-ns = <30>;
es8316: es8316@11 { //声卡
#sound-dai-cells = <0>;
compatible = "everest,es8316";
reg = <0x11>;
clocks = <&cru SCLK_I2S_8CH_OUT>;
clock-names = "mclk";
pinctrl-names = "default";
pinctrl-0 = <&i2s_8ch_mclk>;
spk-con-gpio = <&gpio0 RK_PB3 GPIO_ACTIVE_HIGH>;
};
};
但是fm1288我们是通过串口配置参数的，所以这步可以不要，通过apk读写串口直接配置参数就可以。
除此之外，主要是配置设备树，以及驱动代码修改。
二、配置步骤
1.i2s配置
因为声卡要接 i2s ，所以先要打开 i2s
&i2s0 {
status = "okay";
rockchip,i2s-broken-burst-len;
rockchip,playback-channels = <8>;
rockchip,capture-channels = <8>;
#sound-dai-cells = <0>;
};
2.声卡配置
因为是用串口配置参数，所以使用虚拟声卡
dummy_codec: dummy-codec {
status = "okay";
compatible = "rockchip,dummy-codec";
#sound-dai-cells = <0>;
clocks = <&cru SCLK_I2S_8CH_OUT>;
clock-names = "mclk";
pinctrl-names = "default";
pinctrl-0 = <&i2s_8ch_mclk>;
};
fm1288_sound: fm1288-sound {
status = "okay";
compatible = "simple-audio-card"; //声卡通用驱动匹配
simple-audio-card,name = "rockchip,fm1288-sound"; //注册的声卡名
simple-audio-card,format = "i2s";
simple-audio-card,mclk-fs = <256>;
//这两段是麦克风喇叭配置，因为麦克风喇叭直接接在了fm1288上所以不需要配置，若是接在rk3399上，则需要
/* simple-audio-card,widgets =
"Microphone", "Mic Jack",
"Headphone", "Headphone Jack";
simple-audio-card,routing =
"Mic Jack", "MICBIAS1",
"IN1P", "Mic Jack",
"Headphone Jack", "HPOL",
"Headphone Jack", "HPOR"; */
simple-audio-card,cpu { //cpu段audio主控
sound-dai = <&i2s0>;
};
simple-audio-card,codec { //codec段，用于跟cpu绑定
sound-dai = <&dummy_codec>;
};
};
注册后的声卡可以看到
2.麦克风，喇叭配置
上述讲过麦克风喇叭因为没有接在rk3399平台上，所以此时在android层放录音是没有声音的，需要配置 fm1288声卡数据直接输出到 rk3399平台。
hardware/rockchip/audio/tinyalsa_hal/audio_hw.c 修改在麦克风，喇叭处添加fm1288声卡：
static bool is_speaker_out_sound_card(char* buf)
{
/*add sound card name of speaker here*/
const char* NAME [] =
{
"rockchiprk",
"realtekrt5651co",
"rockchipes8316c",
"rockchiprk809co",
+ "rockchipfm1288s",
};
static bool is_mic_in_sound_card(char* buf)
{
/*add sound card name of mic here*/
static char* NAME [] =
{
"rockchiprk",
"realtekrt5651co",
"rockchipes8316c",
"rockchiprk809co",
+ "rockchipfm1288s",
};
原作者：紫叶dk
