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QR Code ISO/IEC18004 Decoder In None
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between the two languages. In PICBASIC, button polls the speci ed button, and if it is in the target state, it performs a debounce poll of the button for 10 ms before jumping to the destination. The Stamp button function is designed to poll the button in a loop around and increment a count each time the button is down (and clear it if it is up). For the application, I really wanted to implement a 1-ms loop in which each of the two buttons would be polled. To do this, I ended up going away from the PICBASIC button function and ended up writing my own Stamp button equivalent function:
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if PORTA.2 = 0 then Debounce Button2 Button1 = Button1 + 1 Count Number of Times Down else Button1 = 0 If Up, Reset endif if Button1 >= 15 then Destination
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In my code, each time the button is polled (which happens once every 1.5 ms nominally), if it is down (the bit equal to 0), I increment a counter. If it is high, then the counter is reset. When the counter reaches a preset value (15 for the preceding example code), the button is determined to be reset, and execution jumps to the Destination label. In this application, after one of the buttons is pressed, the application jumps to either an alphabet or a number display that uses the potentiometer to specify what portion of the string is to be displayed. The code I came up with for the Alphabet display is quite elegant and should be discussed:
Generating QR Code ISO/IEC18004 In VB.NET
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Alphabet: LoopCount = 0 Button2 = 0 Loop_2: ADCON0.2 = 1 pause 1 Start ADC Operation delay 1 msec Debounce Button2 Put in the Alphabet
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Alphabet is From Button1
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if PORTA.3 = 0 then Button2 = Button2 + 1 else Button2 = 0 endif if Button2 >= 15 then Numbers OutPos = ADRES OutPos = OutPos */ 21 for i = 0 to 5
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If Up, Reset
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Draw Data Matrix 2d Barcode In None
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Read the Results of the ADC Get the Scaled Value Update the Alphabet
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MID-RANGE DEVICES
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Code 128A Scanner In Visual Studio .NET
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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
Before starting the button polling loop (which executes once per second), I set the GO/_DONE bit of the ADCON0 register of the PIC16C711. This starts the analog-todigital conversion on the speci ed pin (RA0 in this case). After the 1-ms delay (the pause 1 statement), the other button is polled in my debounce routine, and execution jumps to the different display routine if more than 20 ms has passed with the switch not changing. Note that I do not check both switches, just the one for the other function. This was done to avoid the need to have to wait for the pressed button to be debounced high instead, it is assumed that only one button is pressed at any time. If the button has not been pressed requiring the jump to the other display routine, I read the potentiometer s position from the ADC and scale it for the display. The scaling statement
OutPos = OutPos */ 21
probably requires some explanation. When displaying the alphabet or numbers in this application, I wanted to make sure that all six displays were in use at all times. This means that the last ve positions of each string cannot be used as the starting position of the display. For the alphabet, instead of being able to start with 26 different letters, this application can start with only 21 with the last 5 being in the other displays. If you were to scale a value between 0 and 21 in real life, you would use a calculator and divide by the fraction of 21 over 256. The result s fractional value would be taken off the result, and you would be left with an integer between 0 and 20 (just what you want). Put mathematically, the formula would be
OutPos = int(OutPos * 21 / 256)
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