iio: imu: inv_icm42600: avoid frequent timestamp jitter

Browse source

We are currently synchronizing every time the data timestamp with
the IT timestamp, leading to system jitter jamming timestamps.
To fix that and keep it simple, let's just synchronize when the
delta is bigger than the acceptable jitter, and keep
synchronization at the jitter value.

The result is much stable timestamps reflecting better the real
physical value. Example @50Hz delta timestamp,
* before: 20.123ms, 19.721ms, 20.023ms, 20.353ms, 19.821ms, ...
* after: 20.173ms, 20.173ms, 20.173ms, 20.40ms, 20.173ms, ...

Refactorize code and delete the unnecessary handling of multiple
FIFO data.

Signed-off-by: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@tdk.com>
Link: https://lore.kernel.org/r/20230522093210.817212-1-inv.git-commit@tdk.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

...

This commit is contained in:

Jean-Baptiste Maneyrol 2023-05-22 09:32:10 +00:00 • committed by Jonathan Cameron

parent 6e42f3710d

commit f3ae82534a

1 changed files with 26 additions and 23 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

49

drivers/iio/imu/inv_icm42600/inv_icm42600_timestamp.c

View file