stm32 hal 正弦波

要在STM32 HAL中生成正弦波，可以使用DAC和DMA。首先需要初始化DAC和DMA，然后将正弦波数据存储在一个数组中，并将其传输到DAC缓冲区中。可以使用以下代码实现：

#define PI 3.14159265358979323846
#define SAMPLE_RATE 10000
#define BUFFER_SIZE 100

uint16_t sin_buffer[BUFFER_SIZE];

void generate_sin_wave(void)
{
    for (int i = 0; i < BUFFER_SIZE; i++)
    {
        sin_buffer[i] = (uint16_t)(2048 * sin(2 * PI * i / BUFFER_SIZE) + 2048);
    }
}

void HAL_DAC_MspInit(DAC_HandleTypeDef* hdac)
{
    GPIO_InitTypeDef GPIO_InitStruct = {0};
    if(hdac->Instance==DAC1)
    {
        /* DAC1 clock enable */
        __HAL_RCC_DAC1_CLK_ENABLE();

        __HAL_RCC_GPIOA_CLK_ENABLE();
        /**DAC1 GPIO Configuration
        PA4     ------> DAC1_OUT1
        */
        GPIO_InitStruct.Pin = GPIO_PIN_4;
        GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
        GPIO_InitStruct.Pull = GPIO_NOPULL;
        HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

        /* DAC1 DMA Init */
        /* DAC_CH1 Init */
        hdma_dac_ch1.Instance = DMA1_Channel3;
        hdma_dac_ch1.Init.Request = DMA_REQUEST_DAC_CH1;
        hdma_dac_ch1.Init.Direction = DMA_MEMORY_TO_PERIPH;
        hdma_dac_ch1.Init.PeriphInc = DMA_PINC_DISABLE;
        hdma_dac_ch1.Init.MemInc = DMA_MINC_ENABLE;
        hdma_dac_ch1.Init.PeriphDataAlignment = DMA_PDATAALIGN_HALFWORD;
        hdma_dac_ch1.Init.MemDataAlignment = DMA_MDATAALIGN_HALFWORD;
        hdma_dac_ch1.Init.Mode = DMA_CIRCULAR;
        hdma_dac_ch1.Init.Priority = DMA_PRIORITY_HIGH;
        if (HAL_DMA_Init(&hdma_dac_ch1) != HAL_OK)
        {
            Error_Handler();
        }

        __HAL_LINKDMA(hdac,DMA_Handle1,hdma_dac_ch1);
    }
}

void HAL_DAC_MspDeInit(DAC_HandleTypeDef* hdac)
{
    if(hdac->Instance==DAC1)
    {
        /* DAC1 clock disable */
        __HAL_RCC_DAC1_CLK_DISABLE();

        /**DAC1 GPIO Configuration
        PA4     ------> DAC1_OUT1
        */
        HAL_GPIO_DeInit(GPIOA, GPIO_PIN_4);

        /* DAC1 DMA DeInit */
        HAL_DMA_DeInit(hdac->DMA_Handle1);
    }
}

void generate_sin_wave(void);

int main(void)
{
    HAL_Init();
    SystemClock_Config();

    generate_sin_wave();

    DAC_HandleTypeDef hdac;
    DMA_HandleTypeDef hdma_dac_ch1;

    hdac.Instance = DAC1;
    hdac.Init.ClockPrescaler = DAC_CLOCKPRESCALER_DIV1;
    hdac.Init.DAC_Trigger = DAC_TRIGGER_T6_TRGO;
    hdac.Init.DAC_OutputBuffer = DAC_OUTPUTBUFFER_ENABLE;
    if (HAL_DAC_Init(&hdac) != HAL_OK)
    {
        Error_Handler();
    }

    if (HAL_DAC_Start_DMA(&hdac, DAC_CHANNEL_1, (uint32_t*)sin_buffer, BUFFER_SIZE, DAC_ALIGN_12B_R) != HAL_OK)
    {
        Error_Handler();
    }

    while (1)
    {
    }
}

在上面的代码中，我们使用DMA将正弦波数据传输到DAC缓冲区中。DMA配置为循环模式，以便在传输完成后自动重新启动。DAC的时钟预分频器设置为1，以获得最大的输出频率。DAC触发源设置为TIM6_TRGO，以便在每个采样周期结束时触发DAC转换。