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The N320 code include some constants that were either unused or
incorrect. This clarifies the lowband frequency.
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Throughout UHD, we often do floating-point comparisons for frequency
ranges that require resilience to floating point rounding errors. Most
of the time the checks look like this:
```cpp
if (fp_compare_epsilon<double>(freq) > boundary) {
// ...
}
```
The exception is the N320 daughterboard control, which uses a custom
epsilon:
```cpp
if (fp_compare_epsilon<double>(freq,
RHODIUM_FREQ_COMPARE_EPSILON) > boundary) {
// ...
}
```
This was, for the most part, not by design, but because authors simply
didn't think about which epsilon value was appropriate for the frequency
comparison. This was complicated by the fact that fp_compare_epsilon
previously had some issues.
This patch introduces FREQ_COMPARE_EPSILON, which is a sensible default
value for fp_compare_epsilon when doing frequency comparisons (note that
fp_compare_delta already had such a value).
Also, it introduces freq_compare_epsilon(x), which is a shorthand for
fp_compare_epsilon<double>(x, FREQ_COMPARE_EPSILON).
We then replace all occurrences of fp_compare_epsilon<double> which are
specific to frequency checks with freq_compare_epsilon.
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Note: template_lvbitx.{cpp,hpp} need to be excluded from the list of
files that clang-format gets applied against.
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Co-Authored-By: Alex Williams <alex.williams@ni.com>
Co-Authored-By: Sugandha Gupta <sugandha.gupta@ettus.com>
Co-Authored-By: Brent Stapleton <brent.stapleton@ettus.com>
Co-Authored-By: Ciro Nishiguchi <ciro.nishiguchi@ni.com>
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- Moves the cutover frequency for the 900 MHz LO filter from 900 to 975 MHz.
This fixes an image issue in TX when transmitting near 325 MHz or 900 MHz.
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- When highband_spur_reduction is enabled, the lowband LO will be disabled
during highband operation. This improves spur performance, but also renders
timed tune commands unusable due to the MPM call.
- A warning is logged if the user uses a timed tune command that would change
the state of the lowband LO, as the MPM call will occur immediately instead
of at the given command time.
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- This is a combination of 5 commits.
- rh: add lo distribution board gpio expander
- rh: add lo distribution mpm functions
- rh: add code to conditionally initialize lo distribution
- rh: change empty i2c device from exception to assertion
- rh: add lo distribution board control
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Co-authored-by: Humberto Jimenez <humberto.jimenez@ni.com>
Co-authored-by: Alex Williams <alex.williams@ni.com>
Co-authored-by: Derek Kozel <derek.kozel@ni.com>
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