On 2024-12-19 11:13, Jonathan Cameron wrote:
On Tue, 17 Dec 2024 16:47:28 -0500
Trevor Gamblin <tgamblin@xxxxxxxxxxxx> wrote:
Add support for the ad4695's oversampling feature when SPI offload is
available. This allows the ad4695 to set oversampling ratios on a
per-channel basis, raising the effective-number-of-bits from 16
(OSR == 1) to 17 (4), 18 (16), or 19 (64) for a given sample (i.e. one
full cycle through the auto-sequencer). The logic for reading and
writing sampling frequency for a given channel is also adjusted based on
the current oversampling ratio.
The non-offload case isn't supported as there isn't a good way to
trigger the CNV pin in this mode. Support could be added in the future
if a use-case arises.
Signed-off-by: Trevor Gamblin <tgamblin@xxxxxxxxxxxx>
Hi Trevor,
The clamping fun of get_calibbias seems overkill. If this isn't going to ever
overflow an s64 maybe just use the high precision to do it the easy way.
I'm not sure you can't just fit it in an s32 for that matter. I've just
not done the maths to check.
Hi Jonathan,
Thanks for your feedback. I'll look it over again, do some testing, and
see if it can be simplified.
Trevor
