/**************************************************************************

myTimer.c

ME 218B Project Hats Off

Team Firefox

March 7, 2010

***************************************************************************/

#include "myTimer.h"

/*-------------------------- Module Functions -----------------------------*/

/*-------------------------- Module Variables -----------------------------*/

static unsigned int curTime = 0;

static char hasTimerStarted = FALSE;

void MyTimer_Init(void) {

if (hasTimerStarted == FALSE) {

hasTimerStarted = TRUE;

TIM0_TSCR1 = _S12_TEN; //Turn timer system on

TIM0_TSCR2 = TIM0_TSCR2 | _S12_PR1 | _S12_PR0; //Set pre-scale to /8 = 3.0MHz

TIM0_TIOS = _S12_IOS4; //Set cap/comp 4 to output compare

TIM0_TC4 = (unsigned int) (TIM0_TCNT + 3000); //Schedule first event for 4

TIM0_TFLG1 = _S12_C4F; //Clear OC4 flag

TIM0_TIE |= _S12_C4I; //Enable OC4 interrupts

EnableInterrupts;

}

}

unsigned int MyTimer_GetTime(void) {

return curTime;

}

//Implements blocking code for a given number of ms

//Used primarily for debugging and development

void wait(unsigned int ms) {

unsigned int myTime = 0;

myTime = MyTimer_GetTime();

//wait until the current time minus the start time is greater than the wait time

while ((MyTimer_GetTime() - myTime) < ms) {};

}

//Increment curTime variable every time 1ms occurs during OC interrupt

void interrupt _Vec_tim0ch4 myTimerIntRoutin(void){

curTime++;

TIM0_TC4 = (unsigned int) (TIM0_TCNT + 3000); //Schedule first event for 4

TIM0_TFLG1 = _S12_C4F; //clear OC4 flag

}