PIN Problems interfacing Audio Codec & BT Audio to BBB (MCASP)

[micro...@googlemail.com]

Hello,

i'm having some trouble building a new custom cape for BBB which has audio codec (TLV320AIC3104) and bluetooth audio (CC2564MODA) - maybe someone that is experienced in MCASP can help?

First of all, the only solution i see is to use MCASP0 for AUDIO and MCASP1 for BLUETOOTH AUDIO. I don't think you can connect both chips to MCASP0? 

When wiring up the ICs, i run into a serious PIN collision conflict:

TLV320AIC3104
Codec PIN	BBB PIN	BBB PIN Name	Signal
MCLK	P9_25	GPIO3_21	mcasp0_ahclkx
BCLK	P9_31	SPI1_SCLK	mcasp0_aclkx
WCLK	P9_29	SPI1_D0	mcasp0_fsx
DIN	P9_28	SPI1_CS0	mcasp0_axr2
DOUT	P9_30	SPI1_D1	mcasp0_axr0
CC2564MODA
Codec PIN	BBB PIN	BBB PIN Name	Signal
BCLK	P9_42B	GPIO3_18	mcasp1_aclkx
WCLK	P9_27	GPIO3_19	mcasp1_fsx
DIN	P9_41B	GPIO3_20	mcasp1_axr0
DOUT	P9_25	GPIO3_21	mcasp1_axr1

Unfortunately using another mcasp1_axr instead of axr1 is impossible (MII block most PINs), also muxing mcasp0_ahclkx to another PIN is impossible because of my design (LCD PINs block this way).

In some audio cape schematics, MCLK of TLV320AIC3104 is not even connected to BBB header but is connected directly to 12MHz Oscillator.

My question is, do i really have to connect MCLK <-> mcasp0_ahclkx to make TLV320 work on BBB or can i use 12MHz Oscillator <-> MCLK instead? Which way is better? What might have to be changed in software if using ext. Oscillator?

Thank you very much!!

Chris