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OMAP3530 McBSP Not Receiving

Joe Bauman
Prodigy 160 points

Hi Folks -

I'm trying to connect an ADC to McBSP1 on a BeagleBoard and I appear to be missing something crucial to enable the receiver.  The McBSP is correctly generating clock and frame signals on the CLKR and FSR pins and I can see a clean serial signal coming from the ADC to the DR pin.  I believe I have (most of) the receiver configured correctly.  A couple observations:

- When I enable the receiver (set the SPCR1 RRST bit), the RRDY bit is never set indicating the receiver is ready to be read from.  If I enable the transmitter (set the SPCR2 XRST bit), the XRDY bit is immediately set indicating the transmitter is ready to go.  (Viewed through CCS)

- Since the receiver is apparently not running yet, the DRR register contains just a constant value.

- The only IRQSTATUS bit that is set to indicate an error is the RUNDFLSTAT bit indicating that I am trying to read from an empty receive buffer.

Any suggestions as to what would keep the receiver disabled like this?

Thanks much,

Joe.

  • 0
    Prodigy 160 points

    Problem solved.

    There is a note at the end of the pad multiplexing section of the TRM that states that the CLK pins for the McBSP (and other) modules need to be configured as Input Enabled - even if the clock is configured as an output.

    Hope this helps someone!

    Joe.