properly set the data rate
preliminary tx power setting, uncalibrated
TX_NCO_MODE definitions
support for CW modulation (module behave as a signal generator)

implement get_chip_status and use it to detect command errors

add fifo read and write commands
add comments, add a function to set a single byte property
add bits for global config property and fast response register options

also fix upper half ioctl

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4109 42af7a65-404d-4744-a932-0658087f49c3