使用MSP432的定时器A的输入捕获测量PWM的频率，给出代码

请看下面的代码：

#define TA0CCR2_CAPTURE (TIMER_A_CAPTURECOMPARE_REGISTER_2)
#define TA0CCR2_PIN (GPIO_PIN6)
#define TA0CCR2_PORT (GPIO_PORT_P1)
#define TA0CCR2_GPIO (TA0CCR2_PORT | TA0CCR2_PIN)
#define TA0CCR2_CONFIG (GPIO_PRIMARY_MODULE_FUNCTION)

void configure_pwm_frequency_measurement() {
    // Configure timer A0 to capture the frequency of a PWM waveform on P1.6 (TA0CCR2 pin)
    // Select P1.6 as TA0CCR2 input pin
    GPIO_setAsPeripheralModuleFunctionInputPin(TA0CCR2_GPIO,TA0CCR2_CONFIG);
    // Reset timer A0
    Timer_A_clear(TIMER_A0_BASE);
    // Configure timer A0 in capture mode, continue mode, and divide clock by 1
    Timer_A_initCapture(TIMER_A0_BASE, TIMER_A_CAPTURECOMPARE_REGISTER_2,
                        TIMER_A_CAPTUREMODE_RISING_EDGE, TIMER_A_CAPTURE_INPUTSELECT_CCIxA,
                        TIMER_A_CAPTURE_SYNCHRONOUS, TIMER_A_CAPTURECOMPARE_INTERRUPT_DISABLE,
                        TIMER_A_OUTPUTMODE_OUTBITVALUE, TIMER_A_DO_CLEAR);
    // Start timer A0
    Timer_A_startCounter(TIMER_A0_BASE, TIMER_A_CONTINUOUS_MODE);
}

uint32_t measure_pwm_frequency() {
    // Wait for a capture event to occur
    while(!(Timer_A_getCaptureCompareInterruptStatus(TIMER_A0_BASE, TA0CCR2_CAPTURE,
                    TIMER_A_CAPTURE_OVERFLOW | TIMER_A_CAPTURECOMPARE_INTERRUPT_FLAG)));
    // Clear capture flag
    Timer_A_clearCaptureCompareInterrupt(TIMER_A0_BASE, TA0CCR2_CAPTURE);
    // Read timer value
    uint32_t timer_value = Timer_A_getCaptureCompareCount(TIMER_A0_BASE, TA0CCR2_CAPTURE);
    // Calculate frequency
    uint32_t frequency = 3000000 / timer_value; // 3 MHz / timer_value = frequency in Hz
    // Return frequency
    return frequency;
}

这个函数使用MSP432的定时器A的输入捕获功能，测量PWM的频率。其中，TA0CCR2 pin是输入PWM波形的引脚，GPIO_setAsPeripheralModuleFunctionInputPin函数将它设置为了TA0CCR2的输入引脚。Timer_A_initCapture函数用于配置定时器A0，使其以捕获模式、继续模式和除以1的时钟分频来工作。measure_pwm_frequency函数等待捕获事件发生，然后读取定时器的值，通过计算来得到PWM的频率。