MSP432的PWM问题

火辣西米秀

MSP432的PWM问题 [复制链接]

搞了一下PWM。
PWM腿为P2.4

代码：
#include <ti/devices/msp432p4xx/driverlib/driverlib.h>

uint8_t TXData = 1;
uint8_t RXData = 0;

//![Simple Timer_A Config]
/* Timer_A PWM Configuration Parameter */
Timer_A_PWMConfig pwmConfig =
{
        TIMER_A_CLOCKSOURCE_SMCLK,
        TIMER_A_CLOCKSOURCE_DIVIDER_1,
        32000,
        TIMER_A_CAPTURECOMPARE_REGISTER_1,
        TIMER_A_OUTPUTMODE_RESET_SET,
        3200
};
//![Simple Timer_A Config]

int main(void)
{
     /* Halting the watchdog */
    MAP_WDT_A_holdTimer();

    //![Simple Timer_A Example]
    /* Setting MCLK to REFO at 128Khz for LF mode
     * Setting SMCLK to 64Khz */
    MAP_CS_setReferenceOscillatorFrequency(CS_REFO_128KHZ);
    MAP_CS_initClockSignal(CS_MCLK, CS_REFOCLK_SELECT, CS_CLOCK_DIVIDER_1);
    MAP_CS_initClockSignal(CS_SMCLK, CS_REFOCLK_SELECT, CS_CLOCK_DIVIDER_2);
    MAP_PCM_setPowerState(PCM_AM_LF_VCORE0);

    /* Configuring GPIO2.4 as peripheral output for PWM  and P6.7 for button
     * interrupt */
    MAP_GPIO_setAsPeripheralModuleFunctionOutputPin(GPIO_PORT_P2, GPIO_PIN4,
            GPIO_PRIMARY_MODULE_FUNCTION);
    MAP_GPIO_setAsInputPinWithPullUpResistor(GPIO_PORT_P1, GPIO_PIN1);
    MAP_GPIO_clearInterruptFlag(GPIO_PORT_P1, GPIO_PIN1);
    MAP_GPIO_enableInterrupt(GPIO_PORT_P1, GPIO_PIN1);

    /* Configuring Timer_A to have a period of approximately 500ms and
     * an initial duty cycle of 10% of that (3200 ticks)  */
    MAP_Timer_A_generatePWM(TIMER_A0_BASE, &pwmConfig);
    //![Simple Timer_A Example]

    /* Enabling interrupts and starting the watchdog timer */
    MAP_Interrupt_enableInterrupt(INT_PORT1);
    MAP_Interrupt_enableSleepOnIsrExit();
    MAP_Interrupt_enableMaster();

    /* Sleeping when not in use */
    while (1)
    {
        MAP_PCM_gotoLPM0();
    }
}

/* Port1 ISR - This ISR will progressively step up the duty cycle of the PWM
* on a button press
*/
void PORT1_IRQHandler(void)
{
    uint32_t status = MAP_GPIO_getEnabledInterruptStatus(GPIO_PORT_P1);
    MAP_GPIO_clearInterruptFlag(GPIO_PORT_P1, status);

    if (status & GPIO_PIN1)
    {
        if(pwmConfig.dutyCycle == 28800)
            pwmConfig.dutyCycle = 3200;
        else
            pwmConfig.dutyCycle += 3200;

        MAP_Timer_A_generatePWM(TIMER_A0_BASE, &pwmConfig);
    }
}