timer_d_ex3_upDownMode.c

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//******************************************************************************
//  MSP430F51x2 Demo - TimerD0, Toggle P2.3/TD0.0, Up/Down Mode, 32kHz ACLK
//
//  Description: Toggle P1.6 using hardware TD0.0 output. TimerD0 is configured
//  for up/down mode with CCR0 defining period, TD0.0 also output on P1.6. In
//  this example, CCR0 is loaded with 5 and TD0.0 will toggle P2.3 at TDCLK/2*5.
//  Thus the output frequency on P1.6 will be the TDCLK/20. No CPU or software
//  resources required. Normal operating mode is LPM3.
//  As coded with TDCLK = ACLK, P2.3 output frequency = 32768/20 = 1.6384kHz
//  ACLK = TDCLK = LFXT1 = 32kHz, MCLK = default DCO ~1.045MHz
//
//               MSP430F51x2
//            -------------------
//        /|\ |              XIN|-
//         |  |                 | 32kHz
//         ---|RST          XOUT|-
//           |                   |
//           |         P1.6/TD0.0|-->ACLK/20
//
//******************************************************************************
#include "driverlib.h"
 
void main(void)
{
    //Stop WDT
    WDT_A_hold(WDT_A_BASE);
 
    // Configure ports
    GPIO_setAsPeripheralModuleFunctionOutputPin(
          GPIO_PORT_P1,
          GPIO_PIN6
          );
 
    // XT1 configure
    GPIO_setAsPeripheralModuleFunctionInputPin(
          GPIO_PORT_PJ,
           GPIO_PIN4 + GPIO_PIN5
          );
 
    UCS_initClockSignal(UCS_FLLREF,
              UCS_XT1CLK_SELECT,
              UCS_CLOCK_DIVIDER_1
              );
 
    UCS_turnOnLFXT1 (UCS_XT1_DRIVE_3,
          UCS_XCAP_3
      );
 
    UCS_initClockSignal(UCS_ACLK,
              UCS_XT1CLK_SELECT,
              UCS_CLOCK_DIVIDER_1
              );
 
    Timer_D_initCompareModeParam initCompParam = {0};
    initCompParam.compareRegister = TIMER_D_CAPTURECOMPARE_REGISTER_0;
    initCompParam.compareInterruptEnable = TIMER_D_CAPTURECOMPARE_INTERRUPT_DISABLE;
    initCompParam.compareOutputMode = TIMER_D_OUTPUTMODE_TOGGLE;
    initCompParam.compareValue = 5;
    Timer_D_initCompareMode(TIMER_D0_BASE, &initCompParam);
 
    Timer_D_initUpDownModeParam initUpDownParam = {0};
    initUpDownParam.clockSource = TIMER_D_CLOCKSOURCE_ACLK;
    initUpDownParam.clockSourceDivider = TIMER_D_CLOCKSOURCE_DIVIDER_1;
    initUpDownParam.clockingMode = TIMER_D_CLOCKINGMODE_EXTERNAL_CLOCK;
    initUpDownParam.timerPeriod = 5;
    initUpDownParam.timerInterruptEnable_TDIE = TIMER_D_TDIE_INTERRUPT_DISABLE;
    initUpDownParam.captureCompareInterruptEnable_CCR0_CCIE =
        TIMER_D_CAPTURECOMPARE_INTERRUPT_DISABLE;
    initUpDownParam.timerClear = TIMER_D_DO_CLEAR;
    Timer_D_initUpDownMode(TIMER_D0_BASE, &initUpDownParam);
 
    Timer_D_startCounter(
              TIMER_D0_BASE,
              TIMER_D_UPDOWN_MODE
              );
 
    __bis_SR_register(LPM3_bits);             // Enter LPM3
    __no_operation();                         // For debugger
}