Using I2S Codec TLV320AIC23B with mbed

Page last updated 05 Jan 2011, by xeye_ atsu. 0 replies AIC23B, I2S, TLV320AIC23B

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mbed (or LPC1768) has an I2S digital audio interface. So we can build the audio sytem using to enjoy high-quality sound via I2S Codec.

Mr.Simon Ford made audio system using his mbed and TLV320AIC23B (TI).

I also tried to make an audio system using AIC23B and my mbed and......... finally, I succeed;-) .

To control AIC23B... "Use the CMSIS, Luke! The CMSIS will be with you, always!"

NXP semiconductor shows us how to use peripherals on LPC17xx, for example LPC17xx CMSIS-Compliant Standard Peripheral Firmware Driver Library.For instance I used this examples about I2S.

When we use I2S DAC, 4pins are required as follows,

• TX_DIN

• TX_BCLK

• TX_WSCLK(LRCLK)

• TX_MCLK

Unfortunately LPC1768 has a TX_MCLK, but there's no TX_MCLK on mbed's DIP.

I decided to treat mbed as slave and AIC23B as master.AIC23B's MCLK connected external 12MHz-Xtal.

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