cs_ex2_DCO16MHz.c

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//******************************************************************************
//   MSP430FR59xx Demo - Configure MCLK for 16MHz operation
//
//   Description: Configure SMCLK = MCLK = 16MHz
//   IMPORTANT NOTE: While the FRxxx is capable of operation w/ MCLK = 16MHz
//   the throughput of the device is dependent on accesses to FRAM.
//   The maximum speed for accessing FRAM is limited to 8MHz*.
//   Wait states are inserted when the FRAM is accessed at
//   speeds higher than 8MHz to prevent timing violations.
//   Refer to the FRCTL chapter of the User's Guide.
//   * Refer device D/s for typical numbers
//
//           MSP430FR5969
//         ---------------
//     /|\|               |
//      | |               |
//      --|RST            |
//        |               |
//        |               |
//        |          P3.4 |---> SMCLK = MCLK = 16MHz
//
//******************************************************************************
#include "driverlib.h"
 
uint32_t clockValue;
 
void main(void)
{
    //Stop WDT
    WDT_A_hold(WDT_A_BASE);
    //Set DCO frequency to 16MHz
    CS_setDCOFreq(CS_DCORSEL_1, CS_DCOFSEL_4);
 
    CS_initClockSignal(CS_SMCLK,CS_DCOCLK_SELECT,CS_CLOCK_DIVIDER_1);
    CS_initClockSignal(CS_MCLK,CS_DCOCLK_SELECT,CS_CLOCK_DIVIDER_1);
 
    //Set wait state to 1
    FRAMCtl_configureWaitStateControl(FRAMCTL_ACCESS_TIME_CYCLES_1); 
 
    //Set P2.0 as Output Low (for setup as ACLK).
    /*
 
    * Select Port 2
    * Set Pin 0 to output Low.
    */
    GPIO_setOutputLowOnPin(
        GPIO_PORT_P3,
        GPIO_PIN4
    );
 
    //Set P2.0 as Ternary Module Function Output.
    /*
 
    * Select Port 2
    * Set Pin 0 to output Ternary Module Function, (ACLK).
    */
    GPIO_setAsPeripheralModuleFunctionOutputPin(
        GPIO_PORT_P3,
        GPIO_PIN4,
        GPIO_TERNARY_MODULE_FUNCTION
    );
 
    /*
     * Disable the GPIO power-on default high-impedance mode to activate
     * previously configured port settings
     */
    PMM_unlockLPM5();
 
    while(1);
 
}