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Old 11th May 2005, 08:08 PM   #1
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Default 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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Old 11th May 2005, 08:31 PM   #2
sync40 is offline sync40  Mexico
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What is the sampling frequency that you plan to use? Maybe you could use another PIC (i.e. 16F877) dedicated to only the I2S.
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Old 11th May 2005, 08:46 PM   #3
gmarsh is online now gmarsh  Canada
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Looked at dsPIC microcontrollers? you can get them with codec interfaces that can handle I2S input directly...
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Old 12th May 2005, 07:52 PM   #4
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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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