笔记-STM32F407 DAC-DMA-TIM输出正弦波

//通用定时器6中断初始化

//arr：自动重装值。
//psc：时钟预分频数
//定时器溢出时间计算方法:Tout=((arr+1)*(psc+1))/Ft us.
//Ft=定时器工作频率,单位:Mhz
//这里使用的是定时器6!
void TIM6_Init(u16 arr, u16 psc)
{
    TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM6, ENABLE); ///使能TIM6时钟

    TIM_TimeBaseInitStructure.TIM_Period = arr; 	//自动重装载值
    TIM_TimeBaseInitStructure.TIM_Prescaler = psc; //定时器分频
    TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上计数模式
    TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;

    TIM_TimeBaseInit(TIM6, &TIM_TimeBaseInitStructure); //初始化TIM6
	
	/* TIM6 TRGO selection */
	TIM_SelectOutputTrigger(TIM6, TIM_TRGOSource_Update);
	
	TIM_Cmd(TIM6, DISABLE); //使能定时器6

}

//DAC输出配置

DAC_InitTypeDef  DAC_InitStructure;
void DAC_GPIO_Configuration(void)
{
	/* Preconfiguration before using DAC----------------------------------------*/
	GPIO_InitTypeDef GPIO_InitStructure;

	/* DMA1 clock enable */
	RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);
	/* GPIOA clock enable (to be used with DAC) */
	RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);                         
	/* DAC Periph clock enable */
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);

	/* DAC channel 1 & 2 (DAC_OUT1 = PA.4) configuration */
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 ;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
	GPIO_InitStructure.GPIO_PuPd =GPIO_PuPd_NOPULL;// GPIO_PuPd_DOWN;
	GPIO_Init(GPIOA, &GPIO_InitStructure);
}

//通道1配置

void DAC_Ch1_SineWaveConfig(void)
{
	DMA_InitTypeDef DMA_InitStructure;

	/* DAC channel1 Configuration */
	DAC_InitStructure.DAC_Trigger = DAC_Trigger_T6_TRGO;
	DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;
	DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Disable;//DAC_OutputBuffer_Enable;
	DAC_Init(DAC_Channel_1, &DAC_InitStructure);

	/* DMA1_Stream5 channel7 configuration **************************************/
	DMA_DeInit(DMA1_Stream5);
	DMA_InitStructure.DMA_Channel = DMA_Channel_7;  
	DMA_InitStructure.DMA_PeripheralBaseAddr =(uint32_t)(&DAC->DHR12R1);
	DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&sinTable;
	DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;
	DMA_InitStructure.DMA_BufferSize = WaveSize;
	DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
	DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
	DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
	DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
	DMA_InitStructure.DMA_Mode =DMA_Mode_Circular; //DMA_Mode_Normal;//
	DMA_InitStructure.DMA_Priority = DMA_Priority_High;
	DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;         
	DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
	DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
	DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
	DMA_Init(DMA1_Stream5, &DMA_InitStructure);

	/* Enable DMA1_Stream6 */
	DMA_Cmd(DMA1_Stream5, ENABLE);

	/* Enable DAC Channel1 */
	DAC_Cmd(DAC_Channel_1, ENABLE);
//	DAC_SetChannel1Data(DAC_Align_12b_R,0);
	/* Enable DMA for DAC Channel2 */
	DAC_DMACmd(DAC_Channel_1, ENABLE);
}

//通道2配置

void DAC_Ch2_SineWaveConfig(void)
{
  DMA_InitTypeDef DMA_InitStructure;
  
  /* DAC channel2 Configuration */
  DAC_InitStructure.DAC_Trigger = DAC_Trigger_T6_TRGO;
  DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;
  DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Enable;
  DAC_Init(DAC_Channel_2, &DAC_InitStructure);

  /* DMA1_Stream6 channel7 configuration **************************************/
  DMA_DeInit(DMA1_Stream6);
  DMA_InitStructure.DMA_Channel = DMA_Channel_7;  
  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t) (&DAC->DHR12R2);
  DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&cosTable;
  DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;
  DMA_InitStructure.DMA_BufferSize = WaveSize;
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
  DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
  DMA_InitStructure.DMA_Priority = DMA_Priority_High;
  DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;         
  DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
  DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
  DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
  DMA_Init(DMA1_Stream6, &DMA_InitStructure);

  /* Enable DMA1_Stream6 */
  DMA_Cmd(DMA1_Stream6, ENABLE);

  /* Enable DAC Channel2 */
  DAC_Cmd(DAC_Channel_2, ENABLE);

  /* Enable DMA for DAC Channel2 */
  DAC_DMACmd(DAC_Channel_2, ENABLE);
}

//波形产生

u16 sinTable[WaveSize];
u16 cosTable[WaveSize];

void sin_Generation(void)
{
    u16 n;
    for(n = 0; n < WaveSize; n++)
    {
        sinTable[n] = (sin(2 * PI * n / WaveSize) + 1) * 2047;
    }
}
void cos_Generation(void)
{
    u16 n;
    for(n = 0; n < WaveSize; n++)
    {
        cosTable[n] = (cos(2 * PI * n / WaveSize) + 1) * 2047;
    }
}

//调用

{
	DAC_GPIO_Configuration();

	sin_Generation();

	TIM6_Init((84000000/WaveSize/Wave_Frequency)-1,0);
	
	DAC_Ch1_SineWaveConfig();
}