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