STM8L151K4 DAC DMA传输程序刚调通

只看该作者 · 2016-7-8 10:09

static void CLK_Config(void)
{
  /* Select HSE as system clock source */
  CLK_SYSCLKSourceSwitchCmd(ENABLE);
  CLK_SYSCLKSourceConfig(CLK_SYSCLKSource_HSE);
  /* system clock prescaler: 1*/
  CLK_SYSCLKDivConfig(CLK_SYSCLKDiv_1);
  while (CLK_GetSYSCLKSource() != CLK_SYSCLKSource_HSE)
  {}
  /* Enable Clocks of DAC, TIM4 and DMA1 */
  CLK_PeripheralClockConfig(CLK_Peripheral_DAC, ENABLE);
  CLK_PeripheralClockConfig(CLK_Peripheral_TIM4, ENABLE);
  CLK_PeripheralClockConfig(CLK_Peripheral_DMA1, ENABLE);

  CLK_CCOConfig(CLK_CCOSource_HSE,CLK_CCODiv_8);//时钟输出
  CLK_PeripheralClockConfig(CLK_Peripheral_COMP,ENABLE); //因为DAC 用到比较器,所以要打开比较器时钟
}

/**
  * @brief  Configure DMA peripheral
  * @param  None
  * @retval None
  */
static void DMA_Config(void)
{
  /* DMA channel3 Config -----------------------------------------------------*/
  DMA_GlobalDeInit();
  DMA_DeInit(DMA1_Channel3);
  DMA_Init(DMA1_Channel3,  (uint16_t)&Sine12bit, DAC_DR_ADDRESS, //Sine12bit 是要DMA 传达输到DAC 中的数组首址  DAC_DR_ADDRESS 是DAC 数据寄存器首址
         250, DMA_DIR_MemoryToPeripheral, DMA_Mode_Circular, //250 是数组大小
         DMA_MemoryIncMode_Inc, DMA_Priority_High, DMA_MemoryDataSize_HalfWord);

  /* DMA1 Channel 3 enable */
  DMA_Cmd(DMA1_Channel3, ENABLE);
  DMA_GlobalCmd(ENABLE);
}

/**
  * @brief  Configure DAC peripheral
  * @param  None
  * @retval None
  */
static void DAC_Config(void)
{
  /* DAC Channel1 Config: 12bit right ----------------------------------------*/
  /* DAC deinitialize */

  SYSCFG_RIIOSwitchConfig (RI_IOSwitch_15, ENABLE); //打开PB4 DAC
  DAC_DeInit();

  /* Fill DAC Init param DAC_Trigger_T4_TRGO and  DAC Channel1 Init */
  DAC_Init(DAC_Channel_1, DAC_Trigger_T4_TRGO, DAC_OutputBuffer_Enable);
  //DAC_SetChannel1Data(DAC_Align_12b_R,0x0FFF); //DMA 模式可以不用
  /* Enable DAC Channel1 */
  DAC_Cmd(DAC_Channel_1, ENABLE);

  /* Enable DMA for DAC Channel1 */
  DAC_DMACmd(DAC_Channel_1, ENABLE);
}

/**
  * @brief  Configure TIM4 peripheral
  * @param  None
  * @retval None
  */
static void TIM4_Config(void)// 用做DAC更新
{
  TIM4_DeInit();
  /* Time base configuration */
  TIM4_TimeBaseInit(TIM4_Prescaler_32, 0x01);//UP 计数器  从0 上升到 ARR寄存器中的值时溢出, 时钟不能太快,否则有问题

  /* TIM4 TRGO selection */
  TIM4_SelectOutputTrigger(TIM4_TRGOSource_Update);

  /* TIM4 enable counter */
  TIM4_Cmd(ENABLE);
}