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PIC MICROCONTROLLER APPLICATION BASICS
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Decrement the PWM Value Delay 4 msecs
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movlw 4 movwf Dlay movlw 0x020 addlw 0 - 1 btfsc STATUS, Z decfsz Dlay, f goto $ - 3 goto Loop
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The application source code for LedPWM using this method is called lpbetter and is located in the code\ledpwm folder. This method uses less than 40 percent of the code of the original method and half the le registers. It also took me about 2 minutes to make the changes to the original application to come up with lpbetter. I ve left the original application in place as a monument to stubbornness. To get the original LedPWM code working, I spent almost 2 hours trying different tricks before settling on the 16-bit counter, the shift down by 4, and the range check and update. Instead of doing all this work, I really should have been thinking of a better way to implement the code. The lesson I want to impart to you is that if you are having trouble with something; instead of plowing through and trying to get an application to work, take a few moments and re ect on what you are really trying to do and see if there is a better way of doing it. My problem was that I wanted to be clever and use the interrupt handler s 1-ms operation for the high and low of the PWM interrupt to provide me with a counter for changing the PWM signal control variable (PWMOn). The much more ef cient method of implementing the changing PWMOn value was simply to put in my own delay counter in the mainline and ignore what was happening in the interrupt handler. Experiences such as this are lessons; they are not mistakes. Don t get mad at yourself if you miss an obvious opportunity like what I have shown here; instead, remember it for the next time you get in a situation where you are struggling to get an application to work, and try to think up a better way of doing it. Chances are that you ll come up with something pretty spectacular.
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IntDeb: DEBOUNCING INPUTS WITH INTERRUPTS
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When using interrupts for debouncing applications, the decision has to be made on what is the interface to the mainline. In some applications, it may be appropriate to initiate the action of the button read, whereas in others, the interrupts built into the PIC microcontroller can be used to provide a debounced button function that runs in the background and can be checked as required. The IntDeb application uses the RB0/INT pin and TMR0 to provide a background debounced button input that can be polled by the mainline application as required.
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I/O WITH INTERRUPTS
Vcc 16F84
0.1 uF Tantalum Gnd
10 K RB0
Momentary On
10 K
4 16
_MCLR Osc 1 Osc 2 Vss
RA0 PORTB1-7
4 MHz
Figure 20.31 Circuit to demonstrate how to debounce inputs with an interrupt and TMR0.
The circuit for IntDeb is a bit unusual because for the 8-bit output by the PIC microcontroller, I have split them up between PORTA and PORTB. The reason for doing this is expediency because PORTB.0 is required for the button interrupt input. As will be seen in the application code, this does not cause a major problem for the application. The schematic for the IntDeb experiment is shown in Fig. 20.31, and the bill of materials is listed in Table 20.14. The need for the RB0/INT pin to be used as an input makes wiring this application somewhat different from the other applications with which you have worked. The least signi cant bit displayed has been moved from RB0 to RA0.
TABLE 20.14 PART
INTERRUPT DEBOUNCE BILL OF MATERIALS DESCRIPTION
PIC 0.1- F 10k 4-MHz 220 LED bargraph Momentary-on switch Misc.
PIC16F84 04/P 0.1- F tantalum 10 k , 1/4 W 4 MHz with built-in capacitors 220 , 1/4 W
10-LED bargraph Breadboard-mountable momentary-on switch Breadboard, wiring, +5-V power supply
PIC MICROCONTROLLER APPLICATION BASICS
The IntDeb.asm code, found in the code\IntDeb folder, is
title IntDeb - Register Contents Int Debounce. #de ne nDebug ; ; This is Program reads the value in a RAM Register and outputs it ; inverted onto PORTB (which has LEDs to Display the Value). All the ; RAM Registers are Read and Displayed. A button is used as the ; instigator of the next value read. The FSR is Copied into the LEDs ; to Display the current Register Being Displayed. ; ; This program is a modi cation of PROG18.ASM to use the Interrupt ; Handler to Debounce the Button Input. ; ; Hardware Notes: ; Reset is tied directly to Vcc and PWRT is Enabled. ; A 4.7K Pullup and Switch Pull-Down is attached to PORTB.0 ; A 220 Ohm Resistor and LED is attached to PORTB.7:1 ; A 220 Ohm Resistor and LED is attached to PORTA.0 ; ; Updated for the Second Edition: 99.12.28 ; ; Myke Predko ; 97.02.22 ; LIST R=DEC INCLUDE p16f84.inc ; Registers CBLOCK 0x020 Flags Reg ENDC #de ne ButUp Flags, 0 #de ne ButDown Flags, 1
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