Enclose preprocessor define of SPI_SPEED and SPI_DEV_PATH in #ifndef
so that these values can optinally be passed by compiler / makefile
defines at build time for a specific platform or architecture.
Allow CFLAGS to be passed in to Makefile (e.g. to allow preprocessor
defines to be set)
Enclose preprocessor define of SPI_SPEED and SPI_DEV_PATH in #ifndef so that these values can optinally be passed by compiler / makefile defines at build time for a specific platform or architecture.
Allow CFLAGS to be passed in to Makefile (e.g. to allow preprocessor defines to be set)