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

PWM01.c module

ME 218B Project Hats Off

Team Firefox

March 7, 2010

This code initializes the PWM for Channel 0 and gives the public functions:

- initPWM0(unsigned char pol, unsigned char postScale) to initialize PWM

for Channel 0.

Polarity and PWM Clock Select are parameters

- SetPWM0Period(unsigned int period) to set the period

- SetPWM0DutyCycle(unsigned int dutyCycle) to set the duty cycle.

When used in main(), the user still needs to

- Set the Prescale value

(ex: PWMPRCLK = (PWMPRCLK &~ _S12_PCKA2) | _S12_PCKA1 | _S12_PCKA0;)

- Set the Postscale value (ex: PWMSCLA = 75;)

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

/*---------------------------- Include Files ------------------------------*/

#include "PWM01.h"

/*-------------------------- Module Code -----------------------------*/

//Initializes PWM for Channel 0 and takes in the parameters to determine PWM

//Output Polarity and PWM Clock Select (just prescale or prescale & postscale.)

void PWM0_Init(unsigned char pol, unsigned char postScale){

PWME = PWME | _S12_PWME0; //Enable PWM 0

MODRR = MODRR | _S12_MODRR0; //Map PWM0 to Port T

if (pol)

PWMPOL = PWMPOL | _S12_PPOL0; //Set polarity for PWM0(output initially hi)

else

PWMPOL = PWMPOL &~ _S12_PPOL0; // 0

if (postScale) //if postScale = 1 = preScale and postScale

PWMCLK = PWMCLK | _S12_PCLK0; //PWM0 use clock SA = 1

else

PWMCLK = PWMCLK &~ _S12_PCLK0; //PWM0 use clock SA = 0 = prescaled only

setPWM0DutyCycle(0);

}

//Set the number of clock counts in one period

void setPWM0Period(unsigned int period){

PWMPER0 = period;

}

//Set the number of clock counts for the active part of the duty cycle

void setPWM0DutyCycle(unsigned int dutyCycle){

PWMDTY0 = dutyCycle;

}

//Initializes PWM for Channel 1 and takes in the parameters to determine PWM

//Output Polarity and PWM Clock Select (just prescale or prescale & postscale.)

void PWM1_Init(unsigned char pol, unsigned char postScale){

PWME = PWME | _S12_PWME1; //Enable PWM 0

MODRR = MODRR | _S12_MODRR1; //Map PWM0 to Port T

if (pol)

PWMPOL = PWMPOL | _S12_PPOL1; //Set polarity for PWM1(output initially hi)

else

PWMPOL = PWMPOL &~ _S12_PPOL1; // 0

if (postScale) //if postScale = 1 = preScale and postScale

PWMCLK = PWMCLK | _S12_PCLK1; //PWM1 use clock SA = 1

else

PWMCLK = PWMCLK &~ _S12_PCLK1; //PWM1 use clock SA = 0 = prescaled only

setPWM1DutyCycle(0);

}

//Set the number of clock counts in one period

void setPWM1Period(unsigned int period){

PWMPER1 = period;

}

//Set the number of clock counts for the active part of the duty cycle

void setPWM1DutyCycle(unsigned int dutyCycle){

PWMDTY1 = dutyCycle;

}