Using the SPI protocol, the use of ARM control the digital display tube 1 shown 1 to F, from F display tubes 2 to 1 countdown, digital display tubes are always displayed 0. This connection method uses a different chip select to activate the SPI slave (HC595).

SPI通信\Startup.s
.......\spi.plg
.......\spi_Target 1.dep
.......\spi.c
.......\spi_uvproj.bak
.......\Startup.lst
.......\Startup.o
.......\spi.d
.......\spi_uvopt.bak
.......\uart0.c
.......\uart0.h
.......\spi.crf
.......\spi.o
.......\uart0.d
.......\uart0.crf
.......\uart0.o
.......\spi.tra
.......\spi.sct
.......\spi.lnp
.......\spi.map
.......\spi.htm
.......\spi.hex
.......\spi.uvproj
.......\spi.PWI
.......\spi.axf
.......\Last Loaded spi.DBK
.......\spi.DSN
.......\spi.uvopt
SPI通信

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