It is from the disk of a USB2.0 development board which I bought, it contains a total of five compressed files, more than 10 examples, I believe it is useful for us.

GPIF_fifo
.........\firmware
.........\........\dscr.a51
.........\........\dscr.LST
.........\........\dscr.OBJ
.........\........\fw.c
.........\........\fw.LST
.........\........\fw.OBJ
.........\........\GPIF.c
.........\........\GPIF.h
.........\........\GPIF.LST
.........\........\GPIF.OBJ
.........\........\Gpif_fifo
.........\........\Gpif_fifo.hex
.........\........\Gpif_fifo.lnp
.........\........\Gpif_fifo.M51
.........\........\Gpif_fifo.Opt
.........\........\Gpif_fifo.plg
.........\........\Gpif_fifo.Uv2
.........\........\Gpif_fifo_Opt.Bak
.........\........\Gpif_fifo_Uv2.Bak
.........\........\IO.c
.........\........\IO.h
.........\........\IO.LST
.........\........\IO.OBJ
.........\........\periph.c
.........\........\periph.LST
.........\........\periph.OBJ
.........\........\Serial.c
.........\........\Serial.h
.........\........\Serial.LST
.........\........\Serial.OBJ
.........\........\Serial.__i
.........\GPIF_FIFO读写.pdf
GPIF_Single
...........\firmware
...........\........\dscr.a51
...........\........\dscr.LST
...........\........\dscr.OBJ
...........\........\dscr.__i
...........\........\fw.c
...........\........\fw.LST
...........\........\fw.OBJ
...........\........\GPIF.c
...........\........\GPIF.h
...........\........\GPIF.LST
...........\........\GPIF.OBJ
...........\........\Gpif_Single
...........\........\Gpif_Single.hex
...........\........\Gpif_Single.lnp
...........\........\Gpif_Single.M51
...........\........\Gpif_Single.Opt
...........\........\Gpif_Single.plg
...........\........\Gpif_Single.Uv2
...........\........\Gpif_Single_Opt.Bak
...........\........\Gpif_Single_Uv2.Bak
...........\........\IO.c
...........\........\IO.h
...........\........\IO.LST
...........\........\IO.OBJ
...........\........\periph.c
...........\........\periph.LST
...........\........\periph.OBJ
...........\........\Serial.c
...........\........\Serial.h
...........\........\Serial.LST
...........\........\Serial.OBJ
...........\GPIF单字节读写.pdf

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