g2gps opened a new pull request, #2152:
URL: https://github.com/apache/nuttx-apps/pull/2152
## Summary
The calibration test can take a long time on platforms with less processing
power. Allow the default value to be changed with kconfig.
## Impact
The calibration test completes in a more reasonable time.
## Testing
Before this change, with the default 100000 iterations:
```
nsh> calib_udelay
Calibrating timer for main calibration...
Performing main calibration for udelay. This will take approx. 220.677
seconds.
```
With this change, and
`CONFIG_EXAMPLES_CALIB_UDELAY_DELAY_TEST_ITERATIONS=5000`
```
nsh> calib_udelay
Calibrating timer for main calibration...
Performing main calibration for udelay.This will take approx. 12.739 seconds.
Calibration slope for udelay:
Y = m*X + b, where
X is loop iterations,
Y is time in nanoseconds,
b is base overhead,
m is nanoseconds per loop iteration.
m = 127.01355925 nsec/iter
b = 103458.24360897 nsec
Correlation coefficient, R² = 1.0000
Without overhead, 0.00787317 iterations per nanosecond and 7873.18
iterations per millisecond.
Recommended setting for CONFIG_BOARD_LOOPSPERMSEC:
CONFIG_BOARD_LOOPSPERMSEC=7874
```
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