MSP432评测9-----PWM

1万 · 2020-4-19 12:04

本帖最后由 Cjy_JDxy 于 2020-4-19 12:06 编辑

今天搞了一下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);
}
}

效果图：