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ConvertLoop: movlw subwf btfss 12 Distance, w Distance + 1, 0 ; ; Is the Value > 12 Rolled Over to Second Byte
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btfsc goto goto btfss decf movwf incf goto HaveFeet:
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STATUS, C $ + 2 HaveFeet STATUS, C Distance + 1, f Distance Feet, f ConvertLoop
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Negative Value Remaining Distance is Less than 12 Shift Down
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Feet is Correct, Distance has Inches
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This code is a dividing a 2-byte variable by a single-byte constant (12 in this case). Elsewhere in this book I have presented you with other division-by-constant algorithms, but I used the repeated-subtraction one here because I knew that the maximum distance would be 35 ft. This results in a maximum number of cycles through the loop of 420 instruction cycles, or 420 s in this application. In this code, note that I save the result in w register before jumping to HaveFeet. If the result is greater than 0, then the new value is stored back into Distance. When HaveFeet is executed, the Feet variable has the number of feet found in the Distance, whereas the lower byte of Distance has the remainder in inches. These two values are then sent to the serial LCD interface. The NRZ serial output routine is a very standard bit banging output routine with the carry ag used to indicate the bit value after the data has been shifted. When using the Polaroid 6500 PIC12C509 distance-measuring circuit initially with the serial LCD interface, I found that there were a number of errors in the transmitted data. When I looked at the data being sent on an oscilloscope, I found that the bit periods were in error by about 1.7 percent. By programming another PIC12C509, I found that I could reduce the bit period error to about 0, at which point the data presented on the LCD display was perfect. After doing this, I realized that I probably should have tried to calibrate the built-in oscillator in the PIC16C505 built into the serial LCD interface. I suspect that the part I used in the serial LCD interface also has a reasonably high error that added to the error of the PIC12C509. By choosing a different device, I was able to decrease the combined error to the point where the data was accurate under all circumstances. Key: SWITCH MATRIX KEY MATRIX A switch matrix keyboard is a series of switches wired in rows and columns. The switches can be read by pulling up each row individually, then tying down a column to ground, and then seeing if a switch is pulling a row to ground through the column. This is shown in Fig. 21.11. The typical example shown for interfacing a microcontroller to a switch matrix keyboard is a 4 4 keypad. While this can be useful in some applications,
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Figure 21.11 The switch matrix keypad circuit was built on a vector prototyping board and provides a wiring interface between the PIC MCU and the switch matrix keypad.
often only a full QWERTY keyboard will do. For this project, I wanted to go through how a switch matrix keyboard could be attached to a PIC microcontroller. The pull-down transistors shown in Fig. 21.12 can be either discrete transistors or PIC I/O pins individually kept in input mode and changed to output mode with a 0 or lowvoltage output to simulate the switch column being pulled down to ground. From the gure it can be seen that when one of the switches is closed and the column it is connected to is pulled down to ground, the receiver will sense a low value. If the switch were open and the column were pulled down to ground, the pull-up would cause the PIC microcontroller to sense a high value. This method of switch sensing is analogous to having multiple open-collector outputs on a single pulled-up line. To scan the keyboard, each pull-down is enabled individually in series, and any time an input value is low, the key s switch at that row/column address is closed and the key pressed. With this scheme, there are a few issues to consider:
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