add success checks in packet handler config
enable pullups on gpios
add code to customize irq enabling
setup rx_start to go back to rx on rx timeout.
display more int status

lots of small misc changes
conditional storage of int status
custom irq setting
cut long lines and add {}
add bit definitions for int definition
upper half: manage read timeout

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

Reformat some code

reorganize debug comments
cleanup pending status at boot

implement get_chip_status and use it to detect command errors