写一个基于STM32H750VBT6的1kHz3.3V的正弦波输出

您好，下面是一个基于STM32H750VBT6的1kHz 3.3V正弦波输出的代码示例：

#include "stm32h7xx.h"
#include "stm32h7xx_hal.h"
#include "math.h"

#define PI 3.1415926

TIM_HandleTypeDef htim2;

void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_TIM2_Init(void);

void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
    static float phase = 0.0f;
    static uint16_t sample = 0;
    static float sine_table[1000];
    
    if (htim->Instance == TIM2)
    {
        phase += 2.0f * PI / 1000.0f;
        if (phase >= 2.0f * PI)
        {
            phase -= 2.0f * PI;
        }
        
        float sine_value = sinf(phase);
        uint16_t dac_value = (uint16_t)((sine_value + 1.0f) * 2047.5f);
        DAC1->DHR12R1 = dac_value;
        
        sample++;
        if (sample >= 1000)
        {
            sample = 0;
        }
    }
}

int main(void)
{
    HAL_Init();
    SystemClock_Config();
    MX_GPIO_Init();
    MX_TIM2_Init();
    
    HAL_DAC_Start(&hdac1, DAC_CHANNEL_1);
    HAL_TIM_Base_Start_IT(&htim2);
    
    while (1)
    {
    }
}

void SystemClock_Config(void)
{
    RCC_OscInitTypeDef RCC_OscInitStruct = {0};
    RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

    /** Supply configuration update enable */
    HAL_PWREx_ConfigSupply(PWR_LDO_SUPPLY);
    /** Configure the main internal regulator output voltage */
    __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
    /** Initializes the RCC Oscillators according to the specified parameters
    * in the RCC_OscInitTypeDef structure.
    */
    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
    RCC_OscInitStruct.HSEState = RCC_HSE_ON;
    RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
    RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
    RCC_OscInitStruct.PLL.PLLM = 4;
    RCC_OscInitStruct.PLL.PLLN = 200;
    RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
    RCC_OscInitStruct.PLL.PLLQ = 8;
    RCC_OscInitStruct.PLL.PLLR = 2;
    if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
    {
        Error_Handler();
    }
    /** Initializes the CPU, AHB and APB buses clocks
    */
    RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                                |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
    RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
    RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
    RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
    RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;

    if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_7) != HAL_OK)
    {
        Error_Handler();
    }
}

static void MX_TIM2_Init(void)
{
    TIM_MasterConfigTypeDef sMasterConfig = {0};

    htim2.Instance = TIM2;
    htim2.Init.Prescaler = 0;
    htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
    htim2.Init.Period = 20; // 1kHz
    htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
    if (HAL_TIM_Base_Init(&htim2) != HAL_OK)
    {
        Error_Handler();
    }
    sMasterConfig.MasterOutputTrigger = TIM_TRGO_UPDATE;
    sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
    if (HAL_TIMEx_MasterConfigSynchronization(&htim2, &sMasterConfig) != HAL_OK)
    {
        Error_Handler();
    }
}

static void MX_GPIO_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStruct = {0};

    __HAL_RCC_GPIOA_CLK_ENABLE();
    __HAL_RCC_DAC12_CLK_ENABLE();

    HAL_DAC_Init(&hdac1);
    
    HAL_DAC_Start(&hdac1, DAC_CHANNEL_1);
    
    HAL_DACEx_TriangleWaveGenerate(&hdac1, DAC_CHANNEL_1, DAC_TRIANGLEAMPLITUDE_4095);
    
    GPIO_InitStruct.Pin = GPIO_PIN_4;
    GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
}

上面的代码使用TIM2作为计时器，并在每次计时器中断回调函数中更新DAC的输出值。在回调函数中，使用一个正弦表来生成正弦波，然后将正弦波值转换为DAC输出值。最后，启动DAC和计时器以开始输出正弦波。

请注意，此代码示例仅用于演示目的，并可能需要进行调整以适应您的具体硬件和需求。