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Forum: DSP MATLAB SHARC BTC failure


von Markus (Guest)


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hi guys,

i am working on a student bachelor thesis where i should implement a BTC 
from matlab to the SHARC ADSP-21369 EZ-Kit to edit parameters for a 
simple 3-band-EQ during the board's runtime.

i have now a class in matlab including the methods for accessing, 
writing and reading the BTC and i have initialized the channels in 
VisualDSP++ like shown in the getting started example.

now i have the following problem:

i will transmit filter coefficients für a biquad filter, so the 
numerator-coefficients are 3x1 cell array, the denominator-coeffs 2x1 
cell array

if i try to send these values through the BTC, the BTC memory window 
shows me, that only one single coefficient of the array is edited, the 
others get 0. a very interesting point is, that in the 3x1 cell array 
the 2nd coefficient is edited, the first and the third get zero.

has anyone an idea how to fix this? i would need quite a quick solution, 
because i have to presentate my project on monday.

here is the code ob my accessBTC.m
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classdef accessBTC < handle
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properties
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    numChannels = [];
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    isInitialized = 0; %Logical 0 or 1 to indicate if the class is instantiated to connect to the VisualDSP session
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end
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properties(SetAccess = private)
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    channelList = {}; % Array of channel objects
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end
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methods
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    function initialize(obj)
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        a = actxserver('VisualDSP.ADspApplication');
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        btcPlugin      = a.PluginList.invoke('Item','BtcManager');
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        btcManager     = btcPlugin.Open;
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        btcChannelList = btcManager.ChannelList(int16(0));       % Get the channel list in processor #0 (always INT16)
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        obj.numChannels = btcChannelList.Count;
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        disp(['Total Number of Channels: ', num2str(obj.numChannels)]);
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        % Create the BTC Channel interfaces
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        for i = 1: obj.numChannels
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            obj.channelList{i} = btcChannelList.invoke('Item',int32(i-1));
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        end
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        obj.isInitialized = 1;
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       % S=saveobj(obj);
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   end % End of Method: INITIALIZE
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    function outVal = read(obj,channelNum,width)
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        % Default width is 32; other possible values: 16, 8
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        % Channel num starts frm 0
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        if nargin ==2
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            width = 32;
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        end
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        widthStr = ['btcWidth',num2str(width)];
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        btcChan = obj.channelList{channelNum};
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        out_val = btcChan.Read(widthStr);
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        outVal = cell2mat(out_val);
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    end % End of Method: READ
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    function write(obj, channelNum, val)
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        % input val needs to be a scalar or a vector of int32 or in16 or
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        % int8 values
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        % Channel num starts frm 0
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        if nargin ~=3
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            error('WRITE method for accessBTC object needs 2 inputs.')
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        end
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        btcChan = obj.channelList{channelNum+1};
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        btcChan.Write('btcWidth32',num2cell(val));
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    end %End of Method: WRITE
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    function reset(obj)
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        obj.numChannels = [];
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        obj.isInitialized = 0;
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        obj.channelList = [];
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    end %End of Method: RESET
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end

so if i sending for example these single arrays
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    num_1 = [1.324; -1.45; 0.83]
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    den_1 = [-1.45; 0.74]

i am getting in my BTC memory window as floating point
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    num_1 = [0.0000000; -1.45; 0.0000000]
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    den_1 = [-1.45; 0.0000000]

has anybody an idea how to fix this?

thanks a lot and best regards,

markus

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