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AD7124: update code to match newer linux drivers #39

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AD7124: update code to match newer linux drivers #39

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38a8c25
AD7124/Base: fix sampling_frequency setting
commodo Nov 1, 2024
76240ce
AD7124-{4,8}: adjust channel names for both parts
commodo Nov 1, 2024
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12 changes: 10 additions & 2 deletions +adi/+AD7124/Base.m
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Original file line number Diff line number Diff line change
Expand Up @@ -66,7 +66,11 @@ function delete(obj)
% Set device sampling rate
obj.SampleRate = value;
if obj.ConnectedToDevice
obj.setDeviceAttributeRAW('sampling_frequency', value);
for i=1:length(obj.channel_names)
if (ismember(i, obj.EnabledChannels))
obj.setAttributeRAW(obj.channel_names{i}, 'sampling_frequency', value, false);
end
end
end
end
end
Expand All @@ -79,7 +83,11 @@ function setupInit(obj)
% Do writes directly to hardware without using set methods.
% This is required since Simulink support doesn't support
% modification to nontunable variables at SetupImpl
obj.setDeviceAttributeRAW('sampling_frequency',num2str(obj.SampleRate));
for i=1:length(obj.channel_names)
if (ismember(i, obj.EnabledChannels))
obj.setAttributeRAW(obj.channel_names{i}, 'sampling_frequency', num2str(obj.SampleRate), false);
end
end
end
end

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4 changes: 2 additions & 2 deletions +adi/+AD7124_4/Rx.m
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Expand Up @@ -12,8 +12,8 @@
% `AD7124-4 Datasheet <https://www.analog.com/media/en/technical-documentation/data-sheets/ad7124-4.pdf>`_

properties (Nontunable, Hidden)
channel_names = {'voltage0','voltage1','voltage2'...
'voltage3','voltage4','voltage5','voltage6','voltage7'};
channel_names = {'voltage0-voltage1','voltage2-voltage3',...
'voltage4-voltage5','voltage6-voltage7'};
end

methods
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8 changes: 4 additions & 4 deletions +adi/+AD7124_8/Rx.m
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Expand Up @@ -13,9 +13,9 @@


properties (Nontunable, Hidden)
channel_names = {'voltage0','voltage1','voltage2','voltage3',...
'voltage4','voltage5','voltage6','voltage7','voltage8','voltage9',...
'voltage10','voltage11','voltage12','voltage13','voltage14','voltage15'};
channel_names = {'voltage0-voltage1','voltage2-voltage3',...
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Out of curiosity- why do the channel names look different here? the Shouldn't the differential configuration be considered in the fW?

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well, it's how the implementation of the AD7124 driver is, in the Linux IIO framework;
since the inputs on the AD7124 are differential, the IIO framework decided to represented this as 2 channel-pairs (i.e. voltage0-voltage1 and so on); this is how they show up, when a channel is defined as differential;

what puzzles me, is why this was represented as voltage0','voltage1, etc in the first place

the AD7124 driver has been implemented in Linux (as differential) for a number of years;
so, the channels should have looked more like 'voltage0-voltage1','voltage2-voltage3',

unless, the no-OS implementation was used to test this initially;

'voltage4-voltage5','voltage6-voltage7','voltage8-voltage9',...
'voltage10-voltage11','voltage12-voltage13','voltage14-voltage15'};
end

methods
Expand All @@ -25,4 +25,4 @@
end
end

end
end