83 lines
2.5 KiB
Java
83 lines
2.5 KiB
Java
package de.darkress.pic16f84sim.microcontroller;
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public class Timer
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{
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public static int getCyclesToTimerIncrease()
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{
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return cyclesToTimerIncrease;
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}
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public static void setCyclesToTimerIncrease(int cyclesToTimerIncrease)
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{
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Timer.cyclesToTimerIncrease = cyclesToTimerIncrease;
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}
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private static int cyclesToTimerIncrease = 1;
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private static boolean timerEnabled()
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{
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return (Memory.getOption() & 0x20) != 0x20;
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}
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public static void resetTimeToTimerIncrease()
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{
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cyclesToTimerIncrease = getPrescalerFactor();
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}
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public static boolean getPrescalerAssignment() {
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return (Memory.getOption() & 0x08) == 0x08;
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}
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private static int getPrescalerFactor() {
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final int MULTIPLIER = 2;
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int prescalerPower = Memory.getOption() & 0x07;
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int prescaler = (int)Math.pow(2, prescalerPower);
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if(!getPrescalerAssignment())
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{
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return prescaler * MULTIPLIER;
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}
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return prescaler;
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}
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private static void increaseTimerRegister()
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{
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int timerRegister = Memory.getRegister(0x01);
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timerRegister = (timerRegister + 1) % 256;
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if(timerRegister == 0)// && !((Memory.getRegister(0x0B) & 0x04) == 0x04)) //check for timer Overflow --> interrupt
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{
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System.out.println("Timer Overflow");
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Memory.setRegister(0x0B, Memory.getRegister(0x0B) | 0x04); //set T0IF
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if(Interrupt.checkTimerInterruptConditions())
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{
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Stack.push(ProgramCounter.getPc());
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ProgramCounter.setProgramCounter(0x04); // Interrupt Vector
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}
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}
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Memory.setTimer(timerRegister);
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}
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public static void decreasePrescaler()
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{
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if(getPrescalerAssignment()) { // Assigned to WatchdogTimer
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cyclesToTimerIncrease--;
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if(cyclesToTimerIncrease == 0) {
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resetTimeToTimerIncrease();
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Watchdog.decreaseWatchdogTimer();
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}
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} else {
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Watchdog.decreaseWatchdogTimer();
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}
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if(timerEnabled()) {
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if(!getPrescalerAssignment()) { // Assigned to timer0
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cyclesToTimerIncrease--;
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if(cyclesToTimerIncrease == 0) {
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resetTimeToTimerIncrease();
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Timer.increaseTimerRegister();
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}
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} else {
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Timer.increaseTimerRegister();
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}
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}
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}
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}
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