ucs_ex3_XT1SourcesACLK.c

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//******************************************************************************
//******************************************************************************
 
#include "driverlib.h"
 
//*****************************************************************************
//
//Variable to store status of Oscillator fault flags
//
//*****************************************************************************
uint16_t status;
 
void main (void)
{
    //Stop watchdog timer
    WDT_A_hold(WDT_A_BASE);
 
    //Set P1.0 to output direction
    GPIO_setAsOutputPin(
        GPIO_PORT_P1,
        GPIO_PIN0
        );
 
    //Set P11.0 to output direction
    //P11.0 to output ACLK
    //Select XT1
    GPIO_setAsPeripheralModuleFunctionOutputPin(
        GPIO_PORT_P11,
        GPIO_PIN0
        );
 
    //Port select XT1
    GPIO_setAsPeripheralModuleFunctionInputPin(
        GPIO_PORT_P7,
        GPIO_PIN0 + GPIO_PIN1
        );
 
    //Initializes the XT1 crystal oscillator with no timeout
    //In case of failure, code hangs here.
    //For time-out instead of code hang use UCS_turnOnLFXT1WithTimeout()
    UCS_turnOnLFXT1(
        UCS_XT1_DRIVE_0,
        UCS_XCAP_3
        );
 
 
    // Enable global oscillator fault flag
    SFR_clearInterrupt(SFR_OSCILLATOR_FAULT_INTERRUPT);
    SFR_enableInterrupt(SFR_OSCILLATOR_FAULT_INTERRUPT);
 
    // Enable global interrupt
    __bis_SR_register(GIE);
 
    //Enter LPM3 w/ interrupts
    __bis_SR_register(LPM3_bits + GIE);
 
    //For debugger
    __no_operation();
}
 
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=UNMI_VECTOR
__interrupt
#elif defined(__GNUC__)
__attribute__((interrupt(UNMI_VECTOR)))
#endif
void NMI_ISR(void)
{
  do {
    // If it still can't clear the oscillator fault flags after the timeout,
    // trap and wait here.
    status = UCS_clearAllOscFlagsWithTimeout(1000);
  } while(status != 0);
}