On the CCC 2015 rad1o badge, the Si5351C clock generator is powered
by the RF section supply (named VDD on the schematic).
So clock_gen_init() must be called after enable_rf_power().
Since the Si5351C is off when the RF power is off, there should be
no need for the shutdown/init calls at startup.
Portions of pin_setup() that establish a safe, low-power state are moved
into the new pin_shutdown(). Use pin_shutdown() to prepare for sleep or
reset or prior to calling pin_setup().
Reliable oscillator start-up requires several hundred milliseconds which
is longer than we are willing to wait at every boot. We could add an
on-demand test in the future instead of an automatic self-test.
Counter-intuitively, this actually saves us two cycles because we unroll
the first iteration of the loop that spins on the interrupt flag, saving
a branch in the case that the flag is clear the first time.
* Initial commit of hackrf_biast
* Cleaned up hackrf_biast
* Cleaned up usage info
* Include getopt.h for non-GNU systems
* Add support for overriding HackRF's default antenna power behavior in firmware. Add support for specifying antenna power behavior in libhackrf.
* Moved bias tee config routines into user_config.c, cleaned up operation of hackrf_biast
* hackrf_biast now calls usage() and exits when invoked with no arguments
* Fixed minor documentation error in usage()
* minor syntax cleanup
* Add some documentation to the host API call
* Add proper declaration magic in hackrf.h to hackrf_set_user_bias_t_opts() to appease Visual Studio
* Documentation changes suggested by @martinling
* Moved bias t setting above switch statement, removed line that explicit turned bias t off when entering OFF mode
* Change hackrf_set_user_bias_t_opts() to use a friendly struct() instead of a bitmask. User friendliness fixes to hackrf_biast options. More clang-format appeasement.
* Removed support for integer mode args from hackrf_biast
* clang-format error fixes
* Tweaked position of comment for clang-format v14
* Reformat files with clang-format v14 instead of 16
* Remove internal numeric modes for bias T settings
Co-authored-by: Martin Ling <martin-github@earth.li>
* Fix documentation error in hackrf_biast.c
---------
Co-authored-by: Martin Ling <martin-github@earth.li>
