87f4a8033a
1) Do not overwrite Reserved Bits in GINTSTS (per ref manual)*
2) Acknowledge all pending int on entry to ISR that are Only rc_w1*
3) Do not disable RXFVL*
4) Loop until RXFVL is cleared*
5) Only clear the NAK on the endpoint on the OTGFS_GRXSTSD_PKTSTS_SETUPDONE to
not loose the first WORD of FIFO all the data (Bug Fix)
Changed marked *are just driver clean up and ensure ints are not lost.
The bug fix is #5
Test case open putty and observer the Set/Get LineCoding
Without this fix #5 the Get will not match the Set, and
infact the data might be skewed by 4 bytes, that are lost
from the FIFO if the OTGFS_DOEPCTL0_CNAK bit is set in the
OTGFS_GRXSTSD_PKTSTS_SETUPRECVD as opposed to the OTGFS_GRXSTSD_PKTSTS_SETUPDONE
Set Line Coding DATA1: 4B | 00 c2 01 00 00 00 08 | c8 1B
Get Line Coding DATA1: 4B | .. .. .. .. 00 00 08 c8 .. 00 00 07 | 7a 72
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