cs_ex3_XT1Fault.c

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 * Copyright (c) 2017, Texas Instruments Incorporated
 * All rights reserved.
 *
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 *    notice, this list of conditions and the following disclaimer.
 *
 * *  Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
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 *    its contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * --/COPYRIGHT--*/
#include "driverlib.h"
 
//******************************************************************************
//******************************************************************************
 
//*****************************************************************************
//
//Variable to store status of Oscillator fault flags and obtain clock frequency
//
//
//*****************************************************************************
uint16_t status;
uint32_t clockValue;
 
void main(void)
{
    //Stop WDT
    WDT_A_hold(WDT_A_BASE);
 
    // LED setup
    //Set P1.0 as an output pin.
    /*
 
     * Select Port 1
     * Set Pin 0 as output
     */
    GPIO_setAsOutputPin(
            GPIO_PORT_P1,
            GPIO_PIN0
    );
 
    //Set P3.5 as Output Low.
    /*
 
    * Select Port 3
    * Set Pin 5 to output Low.
    */
    GPIO_setAsOutputPin(
        GPIO_PORT_P3,
        GPIO_PIN5
    );
 
    // XT1 Setup
    //Set PJ.4 and PJ.5 as Primary Module Function Input.
    /*
 
    * Select Port J
    * Set Pin 4, 5 to input Primary Module Function, XT1.
    */
    GPIO_setAsPeripheralModuleFunctionInputPin(
        GPIO_PORT_PJ,
        GPIO_PIN4 + GPIO_PIN5,
        GPIO_PRIMARY_MODULE_FUNCTION
    );
 
  //Set DCO Frequency
  CS_setDCOFreq(CS_DCORSEL_0,CS_DCOFSEL_3);
  //Initialize ACLK=XT1 and no CLK DIVIDER set to 1
  CS_initClockSignal(CS_ACLK,CS_XT1CLK_SELECT,CS_CLOCK_DIVIDER_1);
  //Initialize SMCLK=DCOCLK and no CLK DIVIDER set to 2
  CS_initClockSignal(CS_SMCLK,CS_DCOCLK_SELECT,CS_CLOCK_DIVIDER_2);
  //Initialize MCLK=DCOCLK and no CLK DIVIDER set to 2
  CS_initClockSignal(CS_MCLK,CS_DCOCLK_SELECT,CS_CLOCK_DIVIDER_2);
  //Set XT1 frequency
  CS_setExternalClockSource(32768,0);
  //Start XT1 external crystal
  CS_turnOnXT1(CS_XT1_DRIVE_0);
 
 
  SFR_clearInterrupt(SFR_OSCILLATOR_FAULT_INTERRUPT);
  // Now that XT1OSC is running, enable fault interrupt
  SFR_enableInterrupt(SFR_OSCILLATOR_FAULT_INTERRUPT);
 
  //Set P2.0 as Output Low.
  /*
 
   * Select Port 2
   * Set Pin 0 to output Low.
   */
  GPIO_setOutputLowOnPin(
            GPIO_PORT_P2,
            GPIO_PIN0
    );
 
  //Set P2.0 as Ternary Module Function Output.
  /*
 
   * Select Port 2
   * Set Pin 0 to output Ternary Module Function, ACLK.
   */
  GPIO_setAsPeripheralModuleFunctionOutputPin(
            GPIO_PORT_P2,
            GPIO_PIN0,
            GPIO_TERNARY_MODULE_FUNCTION
    );
 
 
  CS_turnOffXT2();
 
    clockValue = CS_getSMCLK();
    clockValue = CS_getMCLK();
    clockValue = CS_getACLK();
 
  __bis_SR_register(LPM3_bits+GIE);
 
}
 
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=UNMI_VECTOR
__interrupt
#elif defined(__GNUC__)
__attribute__((interrupt(UNMI_VECTOR)))
#endif
void UNMI_ISR(void)
{
    do
  {
    // set a breakpoint on the line below to observe XT1 operating from VLO
    // when the breakpoint is hit during a crystal fault
 
    //Set P1.0 and P3.5 LED on
    /*
 
    * Select Port 1
    * Set Pin 0 to output high.
    */
    GPIO_setOutputHighOnPin(
        GPIO_PORT_P1,
        GPIO_PIN0
    );
 
    /*
 
    * Select Port 3
    * Set Pin 5 to output high.
    */
    GPIO_setOutputHighOnPin(
        GPIO_PORT_P3,
        GPIO_PIN5
        );
 
    status=CS_clearAllOscFlagsWithTimeout(1000);
 
  } while (status);
 
    //Clear P1.0 LED off
    /*
 
    * Select Port 1
    * Set Pin 0 to output Low.
    */
    GPIO_setOutputLowOnPin(
        GPIO_PORT_P1,
        GPIO_PIN0
        );
 
    //Clear P3.5 LED off
    /*
 
    * Select Port 3
    * Set Pin 5 to output Low.
    */
    GPIO_setOutputLowOnPin(
        GPIO_PORT_P3,
        GPIO_PIN5
    );
 
}