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>
During r9 hardware development it was thought that the MAX2839 would use
a different GPIO pin for chip select, but it ended up being the same pin
as is used for MAX2837 on other hardware revisions.
This takes the MAX283x abstraction a bit further and fixes a bug with
hackrf_debug -m.
The bootloader is configured by pin straps on certain pins. We use some
of those for other purposes in r9 which causes the bootloader to
misbehave if the device is reset from software. By switching these pins
from outputs to inputs just before reset this problem is avoided.
