i2s to parallel conversion

jcsveth · 11th May 2005, 08:08 PM

I need to handle a S/PDIF decoded stream (i2s from a Crystal decoder) in a Microchip PIC or AVR microcontroller and so thought a shift register with a little support logic could transform the serial i2s data to two sets of parallel data (16 bit - one set for each channel)and would free up a lot of time for the microcontroller. Has anyone done this or advise against this?
Thanks, Jeff

sync40 · 11th May 2005, 08:31 PM

What is the sampling frequency that you plan to use? Maybe you could use another PIC (i.e. 16F877) dedicated to only the I2S.

gmarsh · 11th May 2005, 08:46 PM

Looked at dsPIC microcontrollers? you can get them with codec interfaces that can handle I2S input directly...

jcsveth · 12th May 2005, 07:52 PM

Thanks for the quick responses.

Sync40 - another PIC is what I have planned. The sampling rate will be 48KHz - 16Bit and so figured I would alot 4 addressable registers to hold these values and pass them parallel to the operating PIC.

gmarsh - I have not considered these - thanks. I am a bit leary of learning yet another system (software and hardware) but will if the application fits. Time to read the data sheets...

11th May 2005, 08:08 PM	#1
jcsveth diyAudio Member Join Date: Dec 2002 Location: Central Florida	i2s to parallel conversion I need to handle a S/PDIF decoded stream (i2s from a Crystal decoder) in a Microchip PIC or AVR microcontroller and so thought a shift register with a little support logic could transform the serial i2s data to two sets of parallel data (16 bit - one set for each channel)and would free up a lot of time for the microcontroller. Has anyone done this or advise against this? Thanks, Jeff

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11th May 2005, 08:31 PM	#2
sync40 diyAudio Member Join Date: Mar 2005 Location: Mexico	What is the sampling frequency that you plan to use? Maybe you could use another PIC (i.e. 16F877) dedicated to only the I2S.

11th May 2005, 08:46 PM	#3
gmarsh diyAudio Member Join Date: Apr 2004 Location: Halifax, NS, Canada	Looked at dsPIC microcontrollers? you can get them with codec interfaces that can handle I2S input directly...

12th May 2005, 07:52 PM	#4
jcsveth diyAudio Member Join Date: Dec 2002 Location: Central Florida	Thanks for the quick responses. Sync40 - another PIC is what I have planned. The sampling rate will be 48KHz - 16Bit and so figured I would alot 4 addressable registers to hold these values and pass them parallel to the operating PIC. gmarsh - I have not considered these - thanks. I am a bit leary of learning yet another system (software and hardware) but will if the application fits. Time to read the data sheets...

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