MSP432，编程控制SPI接口的DAC模块，输出模拟波形，参数要求如下：用定时器中断控制 DAC 采样点，输出111Hz正弦波

下面是一段简单的代码实现，使用MSP432系列芯片的DAC和SPI模块输出111Hz正弦波：

#include "msp.h"

// 正弦波采样点个数
#define N 64

// DAC输出波形数据
uint16_t sine_wave[N] = {
    2048, 2447, 2831, 3185, 3495, 3750, 3939, 4056, 
    4095, 4056, 3939, 3750, 3495, 3185, 2831, 2447, 
    2048, 1649, 1265, 911, 601, 346, 157, 40, 
    0, 40, 157, 346, 601, 911, 1265, 1649, 
    2048, 2447, 2831, 3185, 3495, 3750, 3939, 4056, 
    4095, 4056, 3939, 3750, 3495, 3185, 2831, 2447, 
    2048, 1649, 1265, 911, 601, 346, 157, 40, 
    0, 40, 157, 346, 601, 911, 1265, 1649
};

// 定时器中断服务程序
void TIMER32_0_IRQHandler(void)
{
    // 清除定时器计数器中断标志
    TIMER32_0->INTCLR = 1;
    
    // DAC输出数据
    static uint8_t index = 0;
    DAC12_0->DAT->DATA = sine_wave[index++];
    if (index == N) {
        index = 0;
    }
}

int main(void)
{
    // 使能DAC和SPI接口时钟
    P1->SEL0 |= BIT5;
    P1->SEL1 &= ~BIT5;
    P5->SEL0 |= BIT4 | BIT5 | BIT6;
    P5->SEL1 &= ~(BIT4 | BIT5 | BIT6);
    CS->KEY = CS_KEY_VAL;
    CS->CLKEN |= CS_CLKEN_DAC_EN;
    CS->CLKEN |= CS_CLKEN_SPI2_EN;
    CS->KEY = 0;
    
    // 配置DAC为12位右对齐数据模式
    DAC12_0->CTL0 = DAC12_0_CTL0_SSEL__MCLK | DAC12_0_CTL0_DAC12ENC | DAC12_0_CTL0_DACREF_EN | DAC12_0_CTL0_DRES__12BIT;
    DAC12_0->CTL1 = DAC12_0_CTL1_DACLSEL_0 | DAC12_0_CTL1_DACSWTRG | DAC12_0_CTL1_DACREF01;
    
    // 配置SPI2接口为8位数据宽度、主机模式、时钟频率为SMCLK/2
    EUSCI_B2->CTLW0 |= EUSCI_B_CTLW0_SWRST;
    EUSCI_B2->CTLW0 = EUSCI_B_CTLW0_SWRST | EUSCI_B_CTLW0_MST | EUSCI_B_CTLW0_SYNC | EUSCI_B_CTLW0_MSB | EUSCI_B_CTLW0_CKPL;
    EUSCI_B2->CTLW0 |= EUSCI_B_CTLW0_SSEL__SMCLK | EUSCI_B_CTLW0_PRE__2 | EUSCI_B_CTLW0_CKPH;
    EUSCI_B2->BRW = 0;
    EUSCI_B2->CTLW0 &= ~EUSCI_B_CTLW0_SWRST;
    
    // 配置定时器32为自动重载模式，并启用定时器计数器中断
    TIMER32_0->LOAD = 181818;
    TIMER32_0->CONTROL = TIMER32_CONTROL_IE | TIMER32_CONTROL_SIZE | TIMER32_CONTROL_MODE;
    NVIC_EnableIRQ(T32_INT0_IRQn);
    TIMER32_0->CONTROL |= TIMER32_CONTROL_ENABLE;
    
    while (1) {
        // 程序主循环
    }
}

代码中使用了定时器中断控制DAC采样点，输出了111Hz的正弦波。需要注意的是，代码中使用了一个64个采样点的正弦波形数据表，可以通过修改波形数据表来输出其他的波形。