barcode reader asp.net web application For example, a value of 142 from the ADC would become in Software

Creation Quick Response Code in Software For example, a value of 142 from the ADC would become

For example, a value of 142 from the ADC would become
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OutPos = = = = = int(OutPos * 21 / 256) int(142 * 21 / 256) int(2,982 / 256) int(11.648) 11
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The result is correct, but the process taken to get there requires real numbers, which the PIC microcontroller simply does not work with very well. This operation could be done in PICBASIC, but it would be terribly expensive in terms of the number of instructions to complete the task.
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What is required, as I ve shown in other parts of this book, is a better way to calculate fractions. The best way that I have found is by multiplying by the maximum value of the new range and discarding the lower 8 bits of the product. Put mathematically, this is
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OutPos = (OutPos * 21) >> 8
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and can be demonstrated using the previous example as
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OutPos = = = = = = (OutPos * 21) >> 8 (142 * 21) >> 8 2,982 >> 8 0xBA6 >> 8 0xB 11
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Multiplication by a constant is very easy in the PIC microcontroller, and shifting a value to the right by 8 bits is accomplished simply by discarding the lower 8 bits. Elsewhere in this book I show how this formula can be implemented very easily in PIC microcontroller assembler. PicBasic has an operator that makes this operation even simpler than the preceding formula, and that is the */ operator, which multiplies two numbers together and lops off the least signi cant byte (8 bits) exactly in the manner in which we require for this scaling operation. The reason why I am showing you this is to get you used to the idea of looking for tricks to make your applications more ef cient and avoid trying to implement applications using the same techniques as you would have used for your high school math homework. Going through the calculator process above will take away any chances for PICBASIC to produce code that is just as ef cient as assembler and will end up being a lot more work for you. If you are going to use a high level language such as PICBASIC, make sure that you understand it reasonably thoroughly and that you can take advantage of special instructions such as the one above. The other point in using PICBASIC (and the Alphabet code above) is to limit the number of lookup and lookdown statements in your application. This is not to say that lookup and lookdown are not implemented ef ciently they are actually quite ef ciently implemented with table operations in PICBASIC. It is just that they are so useful when programming that you will want to use a lot of them. A lot of them will use a lot of space in the PIC microcontroller where there isn t a lot to begin with. In the Alphabet code above, you might have thought it would be better to do something like
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Alphabet: Put in the Alphabet
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for i = 0 to 5 Update the Alphabet lookup i, [ ABCDEFGHIJKLMNOPQRSTUVWXYZ ], j
MID-RANGE DEVICES
Disp[i] = j next i LoopCount = 0 Button2 = 0 Loop_2: ADCON0.2 = 1 pause 1
01234567890123456789012345 Get the Next Character
Alphabet is From Button1
Start ADC Operation delay 1 msec Debounce Button2
if PORTA.3 = 0 then Button2 = Button2 + 1 else Button2 = 0 endif if Button2 >= 15 then Numbers OutPos = ADRES OutPos = OutPos */ 21
If Up, Reset
Read the Results of the ADC Get the Scaled Value
for i = 0 to 5 Update the Alphabet lookup OutPos, [ ABCDEFGHIJKLMNOPQRSTUVWXYZ ], j 01234567890123456789012345 Disp[i] = j Get the Next Character OutPos = OutPos + 1 Increment to the Next Character next i goto Loop_2
where the display is given an initial alphabet value before the ADC is read. The problem with this code is that it doubles the amount of space required for the lookup table. While in itself one lookup is not a lot (about 35 instructions), and it makes implementing a table very easy, two lookups take up more space: 70 instructions, or 7 percent of the total available in the PIC microcontroller. Along with using up more space than is necessary in the PIC microcontroller s program memory, the rst lookup is probably not desired because the correct location for the alphabet display is not known, and the display will ash with the arbitrary string that is sent to the 15-segment LED displays. Even though the ash is only for 1 ms, it probably will be picked up by a user and will not be that attractive the code used will set the correct starting point for the display immediately following the press of the button from the previous display. In case you are wondering, the comment line that follows the lookup table, that is, 01234567890123456789012345, is just my way of keeping track of all the offsets
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