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
1 | classdef accessBTC < handle
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2 |
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3 |
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4 |
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5 | properties
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6 |
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7 | numChannels = [];
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8 |
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9 | isInitialized = 0; %Logical 0 or 1 to indicate if the class is instantiated to connect to the VisualDSP session
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10 |
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11 | end
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12 |
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13 |
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14 |
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15 | properties(SetAccess = private)
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16 |
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17 | channelList = {}; % Array of channel objects
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18 |
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19 | end
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20 |
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21 |
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22 |
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23 | methods
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24 |
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25 |
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26 |
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27 | function initialize(obj)
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28 |
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29 | a = actxserver('VisualDSP.ADspApplication');
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30 |
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31 | btcPlugin = a.PluginList.invoke('Item','BtcManager');
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32 |
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33 | btcManager = btcPlugin.Open;
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34 |
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35 | btcChannelList = btcManager.ChannelList(int16(0)); % Get the channel list in processor #0 (always INT16)
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36 |
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37 | obj.numChannels = btcChannelList.Count;
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38 |
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39 | disp(['Total Number of Channels: ', num2str(obj.numChannels)]);
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40 |
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41 | % Create the BTC Channel interfaces
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42 |
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43 | for i = 1: obj.numChannels
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44 |
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45 | obj.channelList{i} = btcChannelList.invoke('Item',int32(i-1));
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46 |
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47 | end
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48 |
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49 | obj.isInitialized = 1;
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50 |
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51 | % S=saveobj(obj);
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52 |
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53 | end % End of Method: INITIALIZE
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54 |
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55 |
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56 |
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57 | function outVal = read(obj,channelNum,width)
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58 |
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59 | % Default width is 32; other possible values: 16, 8
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60 |
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61 | % Channel num starts frm 0
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62 |
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63 | if nargin ==2
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64 |
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65 | width = 32;
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66 |
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67 | end
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68 |
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69 | widthStr = ['btcWidth',num2str(width)];
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70 |
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71 | btcChan = obj.channelList{channelNum};
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72 |
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73 | out_val = btcChan.Read(widthStr);
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74 |
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75 | outVal = cell2mat(out_val);
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76 |
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77 | end % End of Method: READ
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78 |
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79 |
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80 |
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81 | function write(obj, channelNum, val)
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82 |
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83 | % input val needs to be a scalar or a vector of int32 or in16 or
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84 |
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85 | % int8 values
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86 |
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87 | % Channel num starts frm 0
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88 |
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89 | if nargin ~=3
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90 |
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91 | error('WRITE method for accessBTC object needs 2 inputs.')
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92 |
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93 | end
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94 |
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95 |
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96 |
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97 | btcChan = obj.channelList{channelNum+1};
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98 |
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99 | btcChan.Write('btcWidth32',num2cell(val));
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100 |
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101 | end %End of Method: WRITE
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102 |
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103 |
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104 |
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105 | function reset(obj)
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106 |
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107 | obj.numChannels = [];
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108 |
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109 | obj.isInitialized = 0;
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110 |
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111 | obj.channelList = [];
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112 |
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113 | end %End of Method: RESET
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114 |
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115 |
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116 |
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117 | end
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so if i sending for example these single arrays
1 | num_1 = [1.324; -1.45; 0.83]
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2 | den_1 = [-1.45; 0.74]
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i am getting in my BTC memory window as floating point
1 | num_1 = [0.0000000; -1.45; 0.0000000]
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2 | den_1 = [-1.45; 0.0000000]
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has anybody an idea how to fix this?
thanks a lot and best regards,
markus
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