spi
...\spi.c
...\spi.h
...\SPI_Master
...\..........\Makefile
...\..........\spi_master.c
...\..........\SPI_MASTER.pnproj
...\SPI_Slave
...\.........\Makefile
...\.........\spi_slave.c
...\.........\SPI_SLAVE.pnproj