ESP32-S3模组上跑通ES8388（10）

接前一篇文章：ESP32-S3模组上跑通ES8388（9）

二、利用ESP-ADF操作ES8388

2. 详细解析

上一回解析了es8388_init函数中的第3段代码（也是实际与ES8388寄存器打交道的第1段代码），本回继续往下解析。为了便于理解和回顾，再次贴出es8388_init函数源码，在components\audio_hal\driver\es8388\es8388.c中，如下：


/**
 * @return
 *     - (-1)  Error
 *     - (0)   Success
 */
esp_err_t es8388_init(audio_hal_codec_config_t *cfg)
{
    int res = 0;
#ifdef CONFIG_ESP_LYRAT_V4_3_BOARD
    headphone_detect_init(get_headphone_detect_gpio());
#endif
 
    res = i2c_init(); // ESP32 in master mode
 
    res |= es_write_reg(ES8388_ADDR, ES8388_DACCONTROL3, 0x04);  // 0x04 mute/0x00 unmute&ramp;DAC unmute and  disabled digital volume control soft ramp
    /* Chip Control and Power Management */
    res |= es_write_reg(ES8388_ADDR, ES8388_CONTROL2, 0x50);
    res |= es_write_reg(ES8388_ADDR, ES8388_CHIPPOWER, 0x00); //normal all and power up all
 
    // Disable the internal DLL to improve 8K sample rate
    res |= es_write_reg(ES8388_ADDR, 0x35, 0xA0);
    res |= es_write_reg(ES8388_ADDR, 0x37, 0xD0);
    res |= es_write_reg(ES8388_ADDR, 0x39, 0xD0);
 
    res |= es_write_reg(ES8388_ADDR, ES8388_MASTERMODE, cfg->i2s_iface.mode); //CODEC IN I2S SLAVE MODE
 
    /* dac */
    res |= es_write_reg(ES8388_ADDR, ES8388_DACPOWER, 0xC0);  //disable DAC and disable Lout/Rout/1/2
    res |= es_write_reg(ES8388_ADDR, ES8388_CONTROL1, 0x12);  //Enfr=0,Play&Record Mode,(0x17-both of mic&paly)
//    res |= es_write_reg(ES8388_ADDR, ES8388_CONTROL2, 0);  //LPVrefBuf=0,Pdn_ana=0
    res |= es_write_reg(ES8388_ADDR, ES8388_DACCONTROL1, 0x18);//1a 0x18:16bit iis , 0x00:24
    res |= es_write_reg(ES8388_ADDR, ES8388_DACCONTROL2, 0x02);  //DACFsMode,SINGLE SPEED; DACFsRatio,256
    res |= es_write_reg(ES8388_ADDR, ES8388_DACCONTROL16, 0x00); // 0x00 audio on LIN1&RIN1,  0x09 LIN2&RIN2
    res |= es_write_reg(ES8388_ADDR, ES8388_DACCONTROL17, 0x90); // only left DAC to left mixer enable 0db
    res |= es_write_reg(ES8388_ADDR, ES8388_DACCONTROL20, 0x90); // only right DAC to right mixer enable 0db
    res |= es_write_reg(ES8388_ADDR, ES8388_DACCONTROL21, 0x80); // set internal ADC and DAC use the same LRCK clock, ADC LRCK as internal LRCK
    res |= es_write_reg(ES8388_ADDR, ES8388_DACCONTROL23, 0x00); // vroi=0
 
    res |= es_write_reg(ES8388_ADDR, ES8388_DACCONTROL24, 0x1E); // Set L1 R1 L2 R2 volume. 0x00: -30dB, 0x1E: 0dB, 0x21: 3dB
    res |= es_write_reg(ES8388_ADDR, ES8388_DACCONTROL25, 0x1E);
    res |= es_write_reg(ES8388_ADDR, ES8388_DACCONTROL26, 0);
    res |= es_write_reg(ES8388_ADDR, ES8388_DACCONTROL27, 0);
    // res |= es8388_set_adc_dac_volume(ES_MODULE_DAC, 0, 0);       // 0db
    int tmp = 0;
    if (AUDIO_HAL_DAC_OUTPUT_LINE2 == cfg->dac_output) {
        tmp = DAC_OUTPUT_LOUT1 | DAC_OUTPUT_ROUT1;
    } else if (AUDIO_HAL_DAC_OUTPUT_LINE1 == cfg->dac_output) {
        tmp = DAC_OUTPUT_LOUT2 | DAC_OUTPUT_ROUT2;
    } else {
        tmp = DAC_OUTPUT_LOUT1 | DAC_OUTPUT_LOUT2 | DAC_OUTPUT_ROUT1 | DAC_OUTPUT_ROUT2;
    }
    res |= es_write_reg(ES8388_ADDR, ES8388_DACPOWER, tmp);  //0x3c Enable DAC and Enable Lout/Rout/1/2
    /* adc */
    res |= es_write_reg(ES8388_ADDR, ES8388_ADCPOWER, 0xFF);
    res |= es_write_reg(ES8388_ADDR, ES8388_ADCCONTROL1, 0xbb); // MIC Left and Right channel PGA gain
    tmp = 0;
    if (AUDIO_HAL_ADC_INPUT_LINE1 == cfg->adc_input) {
        tmp = ADC_INPUT_LINPUT1_RINPUT1;
    } else if (AUDIO_HAL_ADC_INPUT_LINE2 == cfg->adc_input) {
        tmp = ADC_INPUT_LINPUT2_RINPUT2;
    } else {
        tmp = ADC_INPUT_DIFFERENCE;
    }
    res |= es_write_reg(ES8388_ADDR, ES8388_ADCCONTROL2, tmp);  //0x00 LINSEL & RINSEL, LIN1/RIN1 as ADC Input; DSSEL,use one DS Reg11; DSR, LINPUT1-RINPUT1
    res |= es_write_reg(ES8388_ADDR, ES8388_ADCCONTROL3, 0x02);
    res |= es_write_reg(ES8388_ADDR, ES8388_ADCCONTROL4, 0x0c); // 16 Bits length and I2S serial audio data format
    res |= es_write_reg(ES8388_ADDR, ES8388_ADCCONTROL5, 0x02);  //ADCFsMode,singel SPEED,RATIO=256
    //ALC for Microphone
    res |= es8388_set_adc_dac_volume(ES_MODULE_ADC, 0, 0);      // 0db
    res |= es_write_reg(ES8388_ADDR, ES8388_ADCPOWER, 0x09);    // Power on ADC, enable LIN&RIN, power off MICBIAS, and set int1lp to low power mode
    
    /* es8388 PA gpio_config */
    gpio_config_t  io_conf;
    memset(&io_conf, 0, sizeof(io_conf));
    io_conf.mode = GPIO_MODE_OUTPUT;
    io_conf.pin_bit_mask = BIT64(get_pa_enable_gpio());
    io_conf.pull_down_en = 0;
    io_conf.pull_up_en = 0;
    gpio_config(&io_conf);
    /* enable es8388 PA */
    es8388_pa_power(true);
 
    codec_dac_volume_config_t vol_cfg = ES8388_DAC_VOL_CFG_DEFAULT();
    dac_vol_handle = audio_codec_volume_init(&vol_cfg);
    ESP_LOGI(ES_TAG, "init,out:%02x, in:%02x", cfg->dac_output, cfg->adc_input);
    return res;
}

接下来是第4段代码：

    /* Chip Control and Power Management */
    res |= es_write_reg(ES8388_ADDR, ES8388_CONTROL2, 0x50);
    res |= es_write_reg(ES8388_ADDR, ES8388_CHIPPOWER, 0x00); //normal all and power up all

1）ES8388_CONTROL2

ES8388_CONTROL2宏也在components\audio_hal\driver\es8388\es8388.h中定义，如下：