File content as of revision 0:0ea9475fc06f:

#include "DMAC.h"

/* HAL objects */
static DAC_HandleTypeDef hdac;
static DMA_HandleTypeDef hdma_dac1;
static TIM_HandleTypeDef htim6;

void DMAC::init()
{
    MX_DMA_Init();
    MX_TIM6_Init();
    MX_DAC_Init();
    
    // disable interrupt
    HAL_NVIC_DisableIRQ(DMA1_Stream5_IRQn);
    
    // start DAC
    HAL_TIM_Base_Start(&htim6);
    HAL_DAC_Start(&hdac,DAC_CHANNEL_1);
}

void DMAC::play(const uint16_t* data, uint32_t len)
{
    // stop DMA
    HAL_DAC_Stop_DMA(&hdac, DAC_CHANNEL_1);
    
    // start DMA
    HAL_DAC_Start_DMA(&hdac, DAC_CHANNEL_1, (uint32_t*)data, len/2, DAC_ALIGN_12B_R);
}



/* HAL functions */
void HAL_TIM_Base_MspInit(TIM_HandleTypeDef* htim_base)
{
  if(htim_base->Instance==TIM6)
  {
    __HAL_RCC_TIM6_CLK_ENABLE();
  }
}

void HAL_DAC_MspInit(DAC_HandleTypeDef* hdac)
{
  GPIO_InitTypeDef GPIO_InitStruct;
  if(hdac->Instance==DAC)
  {
    /* Peripheral clock enable */
    __HAL_RCC_DAC_CLK_ENABLE();
  
    /**DAC GPIO Configuration    
    PA4     ------> DAC_OUT1 
    */
    GPIO_InitStruct.Pin = GPIO_PIN_4;
    GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

    /* DAC DMA Init */
    /* DAC1 Init */
    hdma_dac1.Instance = DMA1_Stream5;
    hdma_dac1.Init.Channel = DMA_CHANNEL_7;
    hdma_dac1.Init.Direction = DMA_MEMORY_TO_PERIPH;
    hdma_dac1.Init.PeriphInc = DMA_PINC_DISABLE;
    hdma_dac1.Init.MemInc = DMA_MINC_ENABLE;
    hdma_dac1.Init.PeriphDataAlignment = DMA_PDATAALIGN_HALFWORD;
    hdma_dac1.Init.MemDataAlignment = DMA_MDATAALIGN_HALFWORD;
    hdma_dac1.Init.Mode = DMA_NORMAL;
    hdma_dac1.Init.Priority = DMA_PRIORITY_LOW;
    hdma_dac1.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
    HAL_DMA_Init(&hdma_dac1);

    __HAL_LINKDMA(hdac,DMA_Handle1,hdma_dac1);
  }
}

/* DAC init function */
void DMAC::MX_DAC_Init()
{
  DAC_ChannelConfTypeDef sConfig;

  /* DAC Initialization */
  hdac.Instance = DAC;
  HAL_DAC_Init(&hdac);

  /*DAC channel OUT1 config */
  sConfig.DAC_Trigger = DAC_TRIGGER_T6_TRGO;
  sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_ENABLE;
  HAL_DAC_ConfigChannel(&hdac, &sConfig, DAC_CHANNEL_1);
}

/* TIM6 init function */
void DMAC::MX_TIM6_Init()
{

  TIM_MasterConfigTypeDef sMasterConfig;

  htim6.Instance = TIM6;
  htim6.Init.Prescaler = 0;
  htim6.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim6.Init.Period = 90 - 1;
  HAL_TIM_Base_Init(&htim6);
  
  sMasterConfig.MasterOutputTrigger = TIM_TRGO_UPDATE;
  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
  HAL_TIMEx_MasterConfigSynchronization(&htim6, &sMasterConfig);
}

/* Enable DMA controller clock */
void DMAC::MX_DMA_Init() 
{
  /* DMA controller clock enable */
  __HAL_RCC_DMA1_CLK_ENABLE();

  /* DMA interrupt init */
  /* DMA1_Stream5_IRQn interrupt configuration */
  HAL_NVIC_SetPriority(DMA1_Stream5_IRQn, 0, 0);
  HAL_NVIC_EnableIRQ(DMA1_Stream5_IRQn);

}