stm32h750v8tx通过stm32cubemx使用ad9854将正弦波转换成方波信号

首先，需要确保STM32H750V8Tx芯片上的SPI外设已经配置好，并且AD9854芯片已经正确连接到了SPI总线上。

接下来，可以使用STM32CubeMX生成代码，并在代码中添加以下函数来控制AD9854芯片：

void AD9854_Init(SPI_HandleTypeDef *hspi)
{
  uint32_t freq_reg = 0x0000;
  uint8_t freq_reg_buf[4] = {0};

  // set frequency register to generate square wave
  freq_reg |= (1 << 31) | (1 << 30); // enable square wave generation and set phase to 0 degrees
  freq_reg |= (1 << 13) | (1 << 12); // set the DAC full scale current to 20 mA
  freq_reg |= (1 << 10) | (1 << 9);  // set the sine wave amplitude to maximum
  freq_reg |= (1 << 8);              // enable the square wave output
  freq_reg_buf[0] = (freq_reg >> 24) & 0xFF;
  freq_reg_buf[1] = (freq_reg >> 16) & 0xFF;
  freq_reg_buf[2] = (freq_reg >> 8) & 0xFF;
  freq_reg_buf[3] = freq_reg & 0xFF;

  // send the frequency register to the AD9854
  HAL_GPIO_WritePin(AD9854_FQ_UD_GPIO_Port, AD9854_FQ_UD_Pin, GPIO_PIN_RESET);
  HAL_SPI_Transmit(hspi, freq_reg_buf, 4, HAL_MAX_DELAY);
  HAL_GPIO_WritePin(AD9854_FQ_UD_GPIO_Port, AD9854_FQ_UD_Pin, GPIO_PIN_SET);
  HAL_Delay(10); // wait for the frequency register to be updated
}

该函数将AD9854芯片配置为产生方波输出。在此之后，您可以使用以下函数生成方波信号：

void AD9854_SquareWave(SPI_HandleTypeDef *hspi, uint32_t freq)
{
  uint32_t phase_reg = 0;
  uint8_t phase_reg_buf[4] = {0};

  // calculate the phase increment from the desired frequency
  uint64_t phase_inc = ((uint64_t)freq << 32) / AD9854_SYS_CLK_FREQ;

  // set the phase increment register
  phase_reg |= (1 << 31); // enable phase increment programming
  phase_reg |= phase_inc & 0xFFFFFFFF;
  phase_reg_buf[0] = (phase_reg >> 24) & 0xFF;
  phase_reg_buf[1] = (phase_reg >> 16) & 0xFF;
  phase_reg_buf[2] = (phase_reg >> 8) & 0xFF;
  phase_reg_buf[3] = phase_reg & 0xFF;

  // send the phase increment register to the AD9854
  HAL_GPIO_WritePin(AD9854_FQ_UD_GPIO_Port, AD9854_FQ_UD_Pin, GPIO_PIN_RESET);
  HAL_SPI_Transmit(hspi, phase_reg_buf, 4, HAL_MAX_DELAY);
  HAL_GPIO_WritePin(AD9854_FQ_UD_GPIO_Port, AD9854_FQ_UD_Pin, GPIO_PIN_SET);
  HAL_Delay(10); // wait for the phase increment register to be updated

  // load the phase accumulator with phase 0
  phase_reg = 0x00000000;
  phase_reg_buf[0] = (phase_reg >> 24) & 0xFF;
  phase_reg_buf[1] = (phase_reg >> 16) & 0xFF;
  phase_reg_buf[2] = (phase_reg >> 8) & 0xFF;
  phase_reg_buf[3] = phase_reg & 0xFF;

  // send the phase accumulator register to the AD9854
  HAL_GPIO_WritePin(AD9854_FQ_UD_GPIO_Port, AD9854_FQ_UD_Pin, GPIO_PIN_RESET);
  HAL_SPI_Transmit(hspi, phase_reg_buf, 4, HAL_MAX_DELAY);
  HAL_GPIO_WritePin(AD9854_FQ_UD_GPIO_Port, AD9854_FQ_UD_Pin, GPIO_PIN_SET);
  HAL_Delay(10); // wait for the phase accumulator register to be updated
}

该函数将AD9854芯片设置为产生指定频率的方波信号。调用此函数后，您可以使用以下代码生成方波信号：

AD9854_Init(&hspi1); // initialize the AD9854
AD9854_SquareWave(&hspi1, 1000); // generate a 1 kHz square wave

请注意，在使用此代码之前，您需要根据实际硬件配置相应的GPIO引脚信息。