The sampling timer and the timestamping timer have the same period.
The sampling interval and the batch size are powers of two.
If the timestamping timer wraps at a power of two larger than the
batch period, it will wrap in sync with the batch period.
Even if it didn't the RPLL would handle that. But it requires that the
timer wraps at the u32/i32 boundary (or be shifted left to wrap there).
