In the McASP user's guide it says the following:
3.6.2 Buffer Underrun Error – TransmitterA buffer underrun can only occur for serializers programmed to be transmitters. A buffer underrun occurs when the serializer is instructed by the transmit state machine to transfer data from XRBUF[n] to XRSR[n], but XRBUF[n] has not yet been written with new data since the last time the transfer occurred. When this occurs, the transmit state machine sets the XUNDRN flag.
An underrun is checked only once per time slot. The XUNDRN flag is set when an underrun condition occurs. Once set, the XUNDRN flag remains set until the DSP explicitly writes a 1 to the XUNDRN bit to clear the XUNDRN bit.
In DIT mode, a pair of BMC zeros is shifted out when an underrun occurs (four bit times at 128 נfs). By shifting out a pair of zeros, a clock may be recovered on the receiver. To recover, reset the McASP and start again with the proper initialization.
In TDM mode, during an underrun case, a long stream of zeros are shifted out causing the DACs to mute. To recover, reset the McASP and start again with the proper initialization.
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In what way does it mean to reset the McASP? Does this mean using SIO_flush or what?
I am trying to solve a problem where an error occurs and when receiving and until we can find the root cause I would like to "reset" the McASP if it occurs.
Thanks
Chris
