barcode scanner c# code project Figure 5-3 Four State Resolution with Three Values in Visual C#.NET

Decoder QR Code 2d barcode in Visual C#.NET Figure 5-3 Four State Resolution with Three Values

Figure 5-3 Four State Resolution with Three Values
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Initial Value Driver Values
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Resultant Value
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Z0, Z1, ZX, R0, R1, RX, F0, F1, FX
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Five
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weakest-----------------------------strongest
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The system consists of three strengths and three logic values The three strengths represent the following: I Z High impedance strength, few hundred k of resistance I R Resistive, few k of resistance I F Forcing, few ohms of resistance The three logic levels are represented as follows: I 0 Logical 0 or false I 1 Logical 1 or true I X Logical unknown The nine states are described as follows: I Z0 High-impedance 0 I Z1 High-impedance 1 I ZX High-impedance unknown I R0 Resistive 0 I R1 Resistive 1 I RX Resistive unknown I F0 Forcing 0 I F1 Forcing 1 I FX Forcing unknown A few simple rules can be used to define how the resolution function should work: Strongest strength always wins If strengths are the same and values are different, return same strength but X value Following are the type declarations needed for the value system:
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PACKAGE ninepack IS TYPE strength IS (Z, R, F); TYPE nineval IS ( Z0, Z1, ZX, TYPE nineval IS ( R0, R1, RX, TYPE nineval IS ( F0, F1, FX ); TYPE ninevalvec IS ARRAY(natural RANGE <>) OF nineval;
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Subprograms and Packages
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TYPE ninevaltab IS ARRAY(nineval LOW TO nineval HIGH) OF nineval; TYPE strengthtab IS ARRAY(strength LOW TO strength HIGH) OF nineval; FUNCTION resolve9( s: ninevalvec) RETURN nineval; END ninepack;
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The package body contains the resolution function (package bodies are discussed near the end of this chapter)
PACKAGE BODY ninepack IS FUNCTION resolve9( s: ninevalvec) RETURN nineval IS VARIABLE result: nineval; CONSTANT get_strength : ninevaltab := (Z, --Z0 Z, --Z1 Z, --ZX R, --R0 R, --R1 R, --RX F, --F0 F, --F1 F); --FX CONSTANT x_tab : strengthtab := (ZX, --Z RX, --R FX); --F BEGIN IF s LENGTH = 0 THEN RETURN ZX; END IF; result := s(0); FOR i IN s RANGE LOOP IF get_strength(result) < get_strength(s(i)) THEN result := s(i); ELSIF get_strength(result) = get_strength(s(i)) THEN IF result /= s(i) THEN result := x_tab(get_strength(result)); END IF; END IF; END LOOP; RETURN result; END resolve9; END ninepack;
The package ninepack declares a number of types used in this example, including some array types to make the resolution function easier to
Five
implement The basic algorithm of the function is the same as the fourval resolution function; however, the operations with nine values are a little more complex Function resolve9 still does a pairwise comparison of the input values to determine the resultant value With a nine-value system, the comparison operation is more complicated, and therefore some constant arrays were declared to make the job easier The constant get_strength returns the driving strength of the driver value The constant x_tab returns the appropriate unknown nine-state value, given the strength of the input These constants could have been implemented as IF statements or CASE statements, but constant arrays are much more efficient In the nine-value system, there are three values at the lowest strength level, so the variable result has to be initialized more carefully to predict correct results If there are no drivers, the range attribute of argument s returns 0, and the default value (ZX) is returned Let s look at a few examples of driver-input arguments and see what the resolution function predicts An example of two drivers is shown in Figure 5-4 This example contains two driver values, Z1 and R0 Variable result is initialized to the first driver value, and the loop executes as many times as there are drivers The first time through the loop, result equals Z1 and the first driver equals Z1 Variable result remains at Z1 because the values are equal The next time through the loop, variable result contains Z1, and the second driver contains R0 The constant get_strength returns strength R The constant get_strength for variable result returns strength Z Strength R is lexically greater than strength Z This is because value R has a higher position number than Z, because R is listed after Z in the type declaration for type strength The fact that the new driver has
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