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WM8805 Software & S/PDIF mode - 96kHz Problems
WM8805 Software & S/PDIF mode - 96kHz Problems
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Old 16th September 2013, 03:30 PM   #11
deusex3 is offline deusex3  Russian Federation
diyAudio Member
Join Date: Dec 2011
Hello! I have WM8805 in software + AK4393. But I can't get it to output Unlock status to GPO4 pin, it always "0", please check up my code:
It configured as master with 24.576 Xtal , RX3 input and i2s output 24bit, several GPO pins directly connected to ground on the board, that's why i setup wm8805 to output other GPO pins in "0" . I2S flow from wm8805 output properly.
 writeto8805(0x03,0x33);     //fraktal k0 
 writeto8805(0x04,0x33);     //k1
 writeto8805(0x05,0x2B);     //k2
 writeto8805(0x06,0b10111); //Prescale = 2

 writeto8805(0x08,0b01011);  //RX3 input 
 writeto8805(0x17,0xff);             // gpo0,1 to 0 level
 writeto8805(0x18,0xff);             // gpo2,3 to 0 level
 writeto8805(0x19,0b11110111);             // gpo4 to unlock
 writeto8805(0x1A,0xff);             // gpo5,6 to 0 level 

writeto8805(0x1C,0b01001010);     // Master mode / 24bits / i2s
writeto8805(0x1D,0b00100000);     // no 192 / GPO outputs

writeto8805(0x1E,0b000100);       // Start clock
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Old 16th February 2015, 07:32 AM   #12
Shinichiro is offline Shinichiro
diyAudio Member
Join Date: Feb 2015
Default WM8805&96kHz Cracking noise problem SOLVED!

Hi !

I'm using SPDIF optic receiver PLR135(Suggested replacement of Toshiba TORX).
By adding 33pF ceramic capacitor between PLR135 output and ground terminals, craking noise disappeared.

I read this thread and tried to see SPDIF wave form by connect the prove to the line. When the prove is connected, the noise disaperad. My prove had about 33pF capacitance and I confirmed 33pF capacitor had the same effect.

Thanks for this thread!

Also note that PLR135 ground should go to DGND, not to PGND of WM8805. And these ground should be apart from MCLK wire.
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Old 5th April 2016, 10:44 AM   #13
yimu163com is offline yimu163com  China
diyAudio Member
Join Date: Apr 2016
Location: Guanggong, China
Send a message via ICQ to yimu163com
Hi Slapbug!I am working on SPDIF to I2S convertion and having difficulty in getting Sampling Frequency from WM8805.Whatever Sampling Frequency of the input SPDIF is,values in REC_FREQ are correct,but FREQ & ORGSAMP remain unchanged,0x0 & 0xb.Have you figured this out?
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