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STM32 F4 DAC Waveform Generator

 
#include "stm32f4_discovery.h"
 
/**************************************************************************/
 
const uint16_t Sine12bit[32] = {
  2047, 2447, 2831, 3185,
  3498, 3750, 3939, 4056,
  4095, 4056, 3939, 3750,
  3495, 3185, 2831, 2447,
  2047, 1647, 1263,  909,
   599,  344,  155,   38,
     0,   38,  155,  344,
   599,  909, 1263, 1647};
 
uint16_t SineTable[64];
 
/**************************************************************************/
 
void RCC_Config(void)
{
  /* DMA1 clock and GPIOA clock enable (to be used with DAC) */
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1 | RCC_AHB1Periph_GPIOA, ENABLE);
 
  /* DAC and TIM6 Peripheral clock enable */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC | RCC_APB1Periph_TIM6, ENABLE);
}
 
/**************************************************************************/
 
void GPIO_Config(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
 
  /* DAC channel 1 & 2 (DAC_OUT1 = PA.4)(DAC_OUT2 = PA.5) configuration */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
}
 
/**************************************************************************/
 
void TIM6_Config(void)
{
    TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
    int Period;
 
  Period = ((SystemCoreClock / 2) / 200000); // 200 KHz timebase, 6.25 KHz Sine
 
  /* Time base configuration */
  TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
  TIM_TimeBaseStructure.TIM_Period = Period - 1;
  TIM_TimeBaseStructure.TIM_Prescaler = 0;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseInit(TIM6, &TIM_TimeBaseStructure);
 
  /* TIM6 TRGO selection */
  TIM_SelectOutputTrigger(TIM6, TIM_TRGOSource_Update);
 
  /* TIM6 enable counter */
  TIM_Cmd(TIM6, ENABLE);
}
 
/**************************************************************************/
 
#define DAC_DHR12RD_ADDRESS 0x40007428 // Right Align 12-bit Dual
 
void DAC_Config(void)
{
    DAC_InitTypeDef DAC_InitStructure;
  DMA_InitTypeDef DMA_InitStructure;
 
  /* DAC channel 1 and 2 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_1, &DAC_InitStructure);
  DAC_Init(DAC_Channel_2, &DAC_InitStructure);
 
  /* DMA1_Stream5 channel7 configuration **************************************/
  DMA_DeInit(DMA1_Stream5);
  DMA_InitStructure.DMA_Channel = DMA_Channel_7;
  DMA_InitStructure.DMA_PeripheralBaseAddr = DAC_DHR12RD_ADDRESS;
  DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&SineTable[0];
  DMA_InitStructure.DMA_BufferSize = 32; // 16-bit x 64 / 2
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;// 32-bit 16x2
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word;
  DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
  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_Stream5, &DMA_InitStructure);
 
  /* Enable DMA1_Stream5 */
  DMA_Cmd(DMA1_Stream5, ENABLE);
 
  /* Enable DAC Channel 1 and 2 */
  DAC_Cmd(DAC_Channel_1, ENABLE);
  DAC_Cmd(DAC_Channel_2, ENABLE);
 
  /* Enable DMA for DAC Channel1 */
  DAC_DMACmd(DAC_Channel_1, ENABLE);
}
 
/**************************************************************************/
 
int main(void)
{
  int i, j;
 
  j = 0;
 
  for(i=0; i<32; i++)
  {
    SineTable[j++] = Sine12bit[i];
    SineTable[j++] = Sine12bit[(i + 8) % 32]; //90 degree phase shift on Channel 2
  }
 
  RCC_Config();
 
  GPIO_Config();
 
  TIM6_Config();
 
  DAC_Config();
 
  while(1); // Do not exit
}