timer_d_ex7_combineRegsPWM.c

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//******************************************************************************
//  MSP430F51x2 Demo - Timer0_D3, Combining two CCRx register to control one
//                     PWM channel; Normal Timer mode
//
//  Description: This code example shows how to combine two CCRx registers to
//  control both the rising and falling edges of one PWM channel (TD0.2, TD1.2).
//  In up-mode, TDxCCR1 controls the rising edge and TDxCCR2 controls the
//  falling edge. In this example, since CCR1 registers of TD0/1 have the same
//  count, the rising edges at TD0.2 and TD1.2 happen almost at the same
//  time instance. With TD0CCR2=40 and TD1CCR2=96, the dutycycles of the TD0.2
//  and TD1.2 are 30% and 43.75%.
//
//  ACLK = REF0; SMCLK = MCLK = default DCO ~1.045MHz.
//
//                 MSP430F51x2
//             -----------------
//         /|\|              XIN|-
//          | |                 |
//          --|RST          XOUT|-
//            |                 |
//            |       P2.0/TD0.2|--> CCR2 - 30% duty cycle;
//            |                 |    ON period=(TD0CCR2-TD0CCR1)/32767 ~ 1.22ms
//            |       P2.3/TD1.2|--> CCR2 - 43.75% duty cycle;
//            |                 |    ON period=(TD1CCR2-TD1CCR1)/32767 ~ 1.7ms
//
//******************************************************************************
#include "driverlib.h"
 
void main(void)
{
    WDT_A_hold(WDT_A_BASE);
 
    // Set port pins
    GPIO_setAsPeripheralModuleFunctionOutputPin(
                  GPIO_PORT_P2,
                  GPIO_PIN0 + GPIO_PIN3
                  );
 
 
    // Configure TimerD0 to combine CCR0/1 block to control TD0CCR2 PWM output
    Timer_D_combineTDCCRToOutputPWMParam pwm1Param = {0};
    pwm1Param.clockSource = TIMER_D_CLOCKSOURCE_SMCLK;
    pwm1Param.clockSourceDivider = TIMER_D_CLOCKSOURCE_DIVIDER_1;
    pwm1Param.clockingMode = TIMER_D_CLOCKINGMODE_EXTERNAL_CLOCK;
    pwm1Param.timerPeriod = 128;
    pwm1Param.combineCCRRegistersCombination = TIMER_D_COMBINE_CCR1_CCR2;
    pwm1Param.compareOutputMode = TIMER_D_OUTPUTMODE_RESET_SET;
    pwm1Param.dutyCycle1 = 40;
    pwm1Param.dutyCycle2 = 80;
    Timer_D_combineTDCCRToOutputPWM(TIMER_D0_BASE, &pwm1Param);
 
    // Configure TimerD1 to combine CCR0/1 block to control TD1CCR2 PWM output
    Timer_D_combineTDCCRToOutputPWMParam pwm2Param = {0};
    pwm2Param.clockSource = TIMER_D_CLOCKSOURCE_SMCLK;
    pwm2Param.clockSourceDivider = TIMER_D_CLOCKSOURCE_DIVIDER_1;
    pwm2Param.clockingMode = TIMER_D_CLOCKINGMODE_EXTERNAL_CLOCK;
    pwm2Param.timerPeriod = 128;
    pwm2Param.combineCCRRegistersCombination = TIMER_D_COMBINE_CCR1_CCR2;
    pwm2Param.compareOutputMode = TIMER_D_OUTPUTMODE_RESET_SET;
    pwm2Param.dutyCycle1 = 40;
    pwm2Param.dutyCycle2 = 96;
    Timer_D_combineTDCCRToOutputPWM(TIMER_D1_BASE, &pwm2Param);
 
    Timer_D_initUpModeParam initUp1Param = {0};
    initUp1Param.clockSource = TIMER_D_CLOCKSOURCE_ACLK;
    initUp1Param.clockSourceDivider = TIMER_D_CLOCKSOURCE_DIVIDER_1;
    initUp1Param.clockingMode = TIMER_D_CLOCKINGMODE_EXTERNAL_CLOCK;
    initUp1Param.timerPeriod = 128-1;
    initUp1Param.timerInterruptEnable_TDIE = TIMER_D_TDIE_INTERRUPT_DISABLE;
    initUp1Param.captureCompareInterruptEnable_CCR0_CCIE =
        TIMER_D_CAPTURECOMPARE_INTERRUPT_DISABLE;
    initUp1Param.timerClear = TIMER_D_DO_CLEAR;
    Timer_D_initUpMode(TIMER_D0_BASE, &initUp1Param);
 
    Timer_D_initUpModeParam initUp2Param = {0};
    initUp2Param.clockSource = TIMER_D_CLOCKSOURCE_ACLK;
    initUp2Param.clockSourceDivider = TIMER_D_CLOCKSOURCE_DIVIDER_1;
    initUp2Param.clockingMode = TIMER_D_CLOCKINGMODE_EXTERNAL_CLOCK;
    initUp2Param.timerPeriod = 128-1;
    initUp2Param.timerInterruptEnable_TDIE = TIMER_D_TDIE_INTERRUPT_DISABLE;
    initUp2Param.captureCompareInterruptEnable_CCR0_CCIE =
        TIMER_D_CAPTURECOMPARE_INTERRUPT_DISABLE;
    initUp2Param.timerClear = TIMER_D_DO_CLEAR;
    Timer_D_initUpMode(TIMER_D1_BASE, &initUp2Param);
 
    Timer_D_startCounter(TIMER_D0_BASE,
          TIMER_D_UP_MODE
          );
    Timer_D_startCounter(TIMER_D1_BASE,
          TIMER_D_UP_MODE
              );
 
    __bis_SR_register(LPM0_bits);             // Enter LPM0
    __no_operation();                         // For debugger
 
}