On 21/11/2015 19:13, Jonathan Cameron wrote:
On 18/11/15 14:38, Marc Titinger wrote:Basic support or direct IO raw read, with averaging attribute. Values are RAW, INT_PLUS_MICRO (Volt/Ampere/Watt). Output of iio_info: iio:device0: ina226 4 channels found: power3: (input) 1 channel-specific attributes found: attr 0: raw value: 1.150000 voltage0: (input) 1 channel-specific attributes found: attr 0: raw value: 0.000003 voltage1: (input) 1 channel-specific attributes found: attr 0: raw value: 4.277500 current2: (input) 1 channel-specific attributes found: attr 0: raw value: 0.268000 4 device-specific attributes found: attr 0: sampling_frequency_available value: 61 120 236... attr 1: in_averaging_steps value: 4 attr 2: in_calibscale value: 10000 attr 3: in_sampling_frequency value: 1506 Tested with ina226, on BeagleBoneBlack. Datasheet: http://www.ti.com/lit/gpn/ina226 Signed-off-by: Marc Titinger <mtitinger@xxxxxxxxxxxx>You have added some new ABI in here, but I'm not seeing any documentation for averaging_steps. Does this map onto the existing oversampling_ratio?
I am not sure normal averaging maps well with oversampling. Normal averaging will provide one value every N samples (this is what this chip does), while oversampling will interpolate N value between sample 'k' and 'k-1', and decimate to provide a less-noisy version of sample 'k', the resulting sampling frequency is not lower.
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