STM32使用DAC输出五个周期的正弦波

以下是STM32使用DAC输出五个周期的正弦波的代码示例：

#include "stm32f4xx.h"

#define DAC_DHR12R2_ADDRESS    0x40007414

const uint16_t sine_wave[32] = {
  2048, 2447, 2831, 3185, 3495, 3750, 3939, 4056,
  4095, 4056, 3939, 3750, 3495, 3185, 2831, 2447,
  2048, 1649, 1265, 910, 600, 345, 156, 39,
  0, 39, 156, 345, 600, 910, 1265, 1649
};

void DAC_Init(void)
{
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);      // Enable DAC clock

  DAC_InitTypeDef  DAC_InitStructure;
  DAC_InitStructure.DAC_Trigger = DAC_Trigger_None;         // DAC output buffer is enabled
  DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None; // Wave generation is disabled
  DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Enable; // DAC channel output buffer is enabled
  DAC_InitStructure.DAC_LFSRUnmask_TriangleAmplitude = DAC_LFSRUnmask_Bit0; // Unmask DAC channel for noise wave generation
  DAC_Init(DAC_Channel_2, &DAC_InitStructure);             // Initialize DAC channel 2
  DAC_Cmd(DAC_Channel_2, ENABLE);                           // Enable DAC channel 2
}

void DAC_SetValue(uint16_t value)
{
  *(volatile uint16_t*)DAC_DHR12R2_ADDRESS = value; // Set DAC channel 2 output value
}

int main(void)
{
  SystemInit(); // Initialize system clock

  DAC_Init(); // Initialize DAC

  while(1)
  {
    for(int i = 0; i < 160; i++)
    {
      DAC_SetValue(sine_wave[i % 32]); // Output sine wave
      for(int j = 0; j < 10000; j++); // Delay to adjust frequency
    }
  }
}

这段代码使用DAC输出一个32个采样点的正弦波，每个采样点的值在0到4095之间。在主循环中，代码不断循环输出五个周期的正弦波。可以通过调整延迟时间来调节正弦波的频率。