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Posted to commits@nuttx.apache.org by "g2gps (via GitHub)" <gi...@apache.org> on 2023/10/24 00:21:27 UTC

[PR] examples/calib_udelay: Allow the number of delay loop iterations to be specified by kconfig. [nuttx-apps]

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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Re: [PR] examples/calib_udelay: Allow the number of delay loop iterations to be specified by kconfig. [nuttx-apps]

Posted by "xiaoxiang781216 (via GitHub)" <gi...@apache.org>.

xiaoxiang781216 merged PR #2152:
URL: https://github.com/apache/nuttx-apps/pull/2152


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