TLV320AIC3254EVM-K: TLV320AIC3254EVM-K: How to route mic with headphone

AJAY HARIHARAN

Hi,

I recently started working with the TLV320AIC3254EVM-K and have verified all the switch connections and jumpers as per user guide. I have successfully tested the audio file playback with the control software through J9 headphone output, and external mic testing through J5 jack. I wish to route the two such that the mic input can be heard through the headphone output. Also, is it possible to record the input data

Thanks in advance

over 4 years ago

0 Diljith over 4 years ago

TI__Expert 6440 points

Hi Ajay,

Digitized microphone signal can be routed to headphone by enabling ADC to DAC loop back. Loop back enable bit is in Page 0, Register 29, Bit D4 (stereo ADC output is routed to stereo DAC input). Recording will continue to work as before. Since you already have the ADC path from microphone to I2S and DAC from I2S to headphone configured, enabling the loop back is all that is required to route microphone data to headphone.

Best Regards.

0 AJAY HARIHARAN over 4 years ago in reply to Diljith

Prodigy 50 points

Hi Diljith,

Thank you for your response. I assume you mean enabling the Digital loopback in the audio interface. I have already tried it after referring a thread in the forum. All I get is a static noise through the headphone output (J9). Is there anything else that I might be missing in the hardware section or on the analog settings in the cs? These are some of the configurations in the cs.