76平台中, 在工模下进行耳机测试,只有左耳机发声
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76上是dual mic设计，左右通道各接一个ADC，并分别接到耳机的左右声道。loopback测试时只开了一个ADC，工场
模式下耳机自动测试走loopback，因此耳机只有一只有声音，这样就可以验证耳机通道的相关元器件是否焊接好，已经
够用。若是需要两个耳机都有声，需开启另一个通道的ADC和amplifier,修改代码如下:
文件路径：
\hal\audio\src\v2中的afe2.c做如下修改
1.
void AFE_TurnOnLoopback( void )
{
afe.loopback = KAL_TRUE;
L1Audio_SetEvent(afe.aud_id, NULL); //add this line
ASSERT(!kal_if_hisr());
kal_trace(TRACE_STATE, AFE_SWITCH_LOOPBACK, '+');
}
2.在函数UpdateVAPDN里面修改如下：
static void UpdateVAPDN(kal_uint8 device, kal_uint16 vapdn_dc_couple_control)
{
if( afe.mic_mute||afe.mic_flag==0 ||afe.mute ) {
//*VOICE_CON3 = ((afe.accessory_flag)? ACCESSORY_USAGE : 0);
*AUDIO_CON21 &= ~0x1000;
*AUDIO_CON22 &= ~0x1000;
*AUDIO_CON23 &= ~0x8800;
#if defined(MT6573_S00) // On MT6573E1, keep VMIC on for AP side TV out detection
afe.accessory_flag = KAL_TRUE;
#endif
if( afe.accessory_flag )
*VMIC_CON0 |= 0x0001;
else
*VMIC_CON0 &= ~0x0001;
return;
}
*VMIC_CON0 |= 0x0001;
#if !(defined(MT6573) || defined(MT6575))
#if defined(__DUAL_MIC_SUPPORT__)
if(afe.mic_src == L1SP_LNA_DIGITAL){
L1Audio_PutMessage( MSG_L1AUDIO2FAS_SPEECH_SET_UL_DEVICE, eAUD_INDEV_DUAL_DIGITAL_MIC, NULL );
*AUDIO_CON24 |= MICSEL;
//*VOICE_CON3 = 0x10 | ((afe.accessory_flag)? ACCESSORY_USAGE : 0);
*AUDIO_CON31 |= 0x8000;
}else if(afe.mic_src >= 0){
L1Audio_PutMessage( MSG_L1AUDIO2FAS_SPEECH_SET_UL_DEVICE, eAUD_INDEV_DUAL_MIC, NULL );
*AUDIO_CON24 &= ~MICSEL;
*AUDIO_CON21 |= 0x1000;
*AUDIO_CON22 |= 0x1000;
*AUDIO_CON23 |= 0x8800;
*AUDIO_CON31 |= 0x8000;
}else{
//*VOICE_CON3 = ((afe.accessory_flag)? ACCESSORY_USAGE : 0);
*AUDIO_CON21 &= ~0x1000;
*AUDIO_CON22 &= ~0x1000;
*AUDIO_CON23 &= ~0x8800;
}
#else
if(afe.mic_src == L1SP_LNA_DIGITAL){
L1Audio_PutMessage( MSG_L1AUDIO2FAS_SPEECH_SET_UL_DEVICE, eAUD_INDEV_SINGLE_DIGITAL_MIC, NULL );
*AUDIO_CON24 |= MICSEL;
*AUDIO_CON31 |= 0x8000;
//*VOICE_CON3 = 0x10 | ((afe.accessory_flag)? ACCESSORY_USAGE : 0);
}else if(afe.mic_src >= 0){
L1Audio_PutMessage( MSG_L1AUDIO2FAS_SPEECH_SET_UL_DEVICE, eAUD_INDEV_SINGLE_MIC, NULL );
*AUDIO_CON24 &= ~MICSEL;
*AUDIO_CON21 |= 0x1000;
/*add begin*/
if(afe.loopback)
*AUDIO_CON22 |= 0x1000;
/*add end*/
#if defined(MT6573) || defined(MT6575)
*AUDIO_CON22 |= 0x1000;
#endif
*AUDIO_CON23 |= 0x8000;
/*add begin*/
if(afe.loopback)
*AUDIO_CON23 |= 0x0800;
/*add end*/
*AUDIO_CON31 |= 0x8000;
}else{
//*VOICE_CON3 = ((afe.accessory_flag)? ACCESSORY_USAGE : 0);
*AUDIO_CON21 &= ~0x1000;
*AUDIO_CON22 &= ~0x1000;
*AUDIO_CON23 &= ~0x8800;
}
#endif
。。。。。。。。