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Possum  
#1 Posted : Monday, March 21, 2016 7:06:31 AM(UTC)
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Hi All,

I am attempting to adapt the Cronus to reclock a multichannel USB streamer and desperately need to know MCLK out and BCLK WORDCLK and the 4 data input pins on Cronus and it woould also be handy to know for Hermess BBB.

Also, Miero kindly advised Hermes header of Cronus Pin 15 is the clock selection switch - "Pull it HIGH for 48k sampling rates".

Is 'high' 5V or 3.3V?

Thanks in advance!

Poss

Edited by user Monday, March 21, 2016 7:09:16 AM(UTC)  | Reason: Not specified

Possum  
#2 Posted : Saturday, April 2, 2016 11:02:30 PM(UTC)
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Obviously a self help forum :-) - I'll answer my own question (from http://bbb.ieero.com/):

Still don't know what V high is but am assuming 5V


BBB pin mapping


P9_25 - A14/0 - mcasp0_ahclkx (oscillator) - GPIO3_21
P9_31 - A13/0 - mcaps0_aclkx (bit clock) - SPI1_SCLK
P9_29 - B13/0 - mcasp0_fsx (lr clock) - SPI1_D0
P9_30 - D12/0 - mcasp0_axr0 (data0) - SPI1_D1
P9_41 - D13/0 - mcasp0_axr1 (data1) - GPIO3_20 shared pin with D14
P9_?? - ?12/2 - mcasp0_axr2 (data2) - configurable, see bellow
P9_27 - C13/2 - mcasp0_axr3 (data3) - GPIO3_19
P9_24 - D15/7 - uart1_txd (external masterclock switch) - GPIO0_15
P9_26 - D16/7 - uart1_rxd (I2S/DSD format switch)- GPIO0_14
P9_14 - U14/7 - gpmc_a2 (cape power switch) - EHRPWM1A

Default mode (kernel param snd_soc_botic.pinconfig=default or not set)
P9_42 - B12/2 - mcasp0_axr2 (data2) - GPIO3_18

Compat mode (kernel param snd_soc_botic.pinconfig=compat)
P9_28 - C12/2 - mcasp0_axr2 (data2) - SPI1_CS0 shared with HDMI audio output

GND is available on any of these pins P9_{01,02,43,44,45,46}.
Possum  
#3 Posted : Sunday, April 3, 2016 9:59:43 AM(UTC)
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Looks like P9_24 is the the serial UART output - so am now assuming 'HIGH' is 3.3V'

Some rudimentary doco (or link thereto) on what the connections/jumpers etc on the Cronus/BBB Hermes are would be greatly appreciated

Edited by user Sunday, April 3, 2016 10:00:39 AM(UTC)  | Reason: Not specified

Brian Donegan  
#4 Posted : Monday, April 4, 2016 2:15:55 PM(UTC)
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thanks 1 user thanked Brian Donegan for this useful post.
Possum on 4/12/2016(UTC)
Possum  
#5 Posted : Tuesday, April 12, 2016 11:25:35 AM(UTC)
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Excellent. Thanks!
Russ White  
#6 Posted : Monday, April 18, 2016 11:26:31 PM(UTC)
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All of the logic is 3.3V
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