STM32H743结合AD9850芯片实现低频信号发生器设计代码

以下是STM32H743结合AD9850芯片实现低频信号发生器的设计代码，仅供参考：

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

#define FXTAL 25000000UL
#define PI 3.14159265358979323846

static SPI_HandleTypeDef hspi1;

void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_SPI1_Init(void);

void AD9850_Set_Frequency(uint32_t freq)
{
    uint32_t fword = (freq * 4294967296) / FXTAL;
    uint8_t buffer[5];
    buffer[0] = 0x02;
    buffer[1] = (fword & 0xFF);
    buffer[2] = (fword >> 8) & 0xFF;
    buffer[3] = (fword >> 16) & 0xFF;
    buffer[4] = (fword >> 24) & 0xFF;
    HAL_GPIO_WritePin(GPIOB, GPIO_PIN_12, GPIO_PIN_RESET);
    HAL_SPI_Transmit(&hspi1, buffer, 5, 100);
    HAL_GPIO_WritePin(GPIOB, GPIO_PIN_12, GPIO_PIN_SET);
}

void AD9850_Set_Phase(uint16_t phase)
{
    uint16_t pword = (phase * 65536) / 360;
    uint8_t buffer[3];
    buffer[0] = 0x01;
    buffer[1] = (pword >> 8) & 0xFF;
    buffer[2] = pword & 0xFF;
    HAL_GPIO_WritePin(GPIOB, GPIO_PIN_12, GPIO_PIN_RESET);
    HAL_SPI_Transmit(&hspi1, buffer, 3, 100);
    HAL_GPIO_WritePin(GPIOB, GPIO_PIN_12, GPIO_PIN_SET);
}

void AD9850_Set_Waveform(uint8_t waveform)
{
    uint8_t buffer[2];
    buffer[0] = 0x00;
    buffer[1] = waveform & 0x0F;
    HAL_GPIO_WritePin(GPIOB, GPIO_PIN_12, GPIO_PIN_RESET);
    HAL_SPI_Transmit(&hspi1, buffer, 2, 100);
    HAL_GPIO_WritePin(GPIOB, GPIO_PIN_12, GPIO_PIN_SET);
}

int main(void)
{
    HAL_Init();
    SystemClock_Config();
    MX_GPIO_Init();
    MX_SPI1_Init();

    while (1)
    {
        for (uint16_t i = 0; i < 360; i++)
        {
            AD9850_Set_Phase(i);
            AD9850_Set_Frequency(1000 * sin(i * PI / 180) + 2000);
            HAL_Delay(10);
        }
    }
}

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

    /** Configure LSE Drive Capability 
    */
    HAL_PWR_EnableBkUpAccess();
    __HAL_RCC_LSEDRIVE_CONFIG(RCC_LSEDRIVE_LOW);
    HAL_PWR_DisableBkUpAccess();

    /** 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 = 25;
    RCC_OscInitStruct.PLL.PLLN = 400;
    RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
    RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV8;
    RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;
    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_6) != HAL_OK)
    {
        Error_Handler();
    }
    PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_SPI1;
    PeriphClkInit.Spi123ClockSelection = RCC_SPI123CLKSOURCE_PLL;
    if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
    {
        Error_Handler();
    }
}

static void MX_SPI1_Init(void)
{
    hspi1.Instance = SPI1;
    hspi1.Init.Mode = SPI_MODE_MASTER;
    hspi1.Init.Direction = SPI_DIRECTION_2LINES;
    hspi1.Init.DataSize = SPI_DATASIZE_8BIT;
    hspi1.Init.CLKPolarity = SPI_POLARITY_LOW;
    hspi1.Init.CLKPhase = SPI_PHASE_1EDGE;
    hspi1.Init.NSS = SPI_NSS_SOFT;
    hspi1.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_32;
    hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB;
    hspi1.Init.TIMode = SPI_TIMODE_DISABLE;
    hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
    hspi1.Init.CRCPolynomial = 7;
    if (HAL_SPI_Init(&hspi1) != HAL_OK)
    {
        Error_Handler();
    }
}

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

    __HAL_RCC_GPIOB_CLK_ENABLE();

    GPIO_InitStruct.Pin = GPIO_PIN_12;
    GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
}

此代码使用了 STM32H743 的 SPI 和 GPIO 与 AD9850 通信，通过调用 AD9850_Set_Frequency()、AD9850_Set_Phase() 和 AD9850_Set_Waveform() 函数来设置 AD9850 的频率、相位和波形。在此示例中，通过循环改变相位和频率来产生正弦波。请注意，此代码仅作为示例，实际应用可能需要进行更多的错误处理和优化。