DAC mit STM32F100

#define DAC1_VOLT  1.2f

#define DAC2_VOLT  1.58f

#define REF_VOLT  3.3f

#define DAC_ACC    4096.0f

const uint16_t _DAC1_DATA = (uint16_t)(((DAC1_VOLT / REF_VOLT) * DAC_ACC) + 0.5f);

const uint16_t _DAC2_DATA = (uint16_t)(((DAC2_VOLT / REF_VOLT) * DAC_ACC) + 0.5f);

void DacOn(void)

{

  GPIO_InitTypeDef GPIO_InitStructure;

  DAC_InitTypeDef  DAC_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);

    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_DAC1 | GPIO_Pin_DAC2;

    GPIO_Init(GPIOA, &GPIO_InitStructure);

    DAC_InitStructure.DAC_Trigger = DAC_Trigger_None;

    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);

    DAC_Cmd(DAC_Channel_1, ENABLE);

    DAC_Cmd(DAC_Channel_2, ENABLE);

    DAC_SetChannel1Data(DAC_Align_12b_R, _DAC1_DATA);

    DAC_SetChannel2Data(DAC_Align_12b_R, _DAC2_DATA);

    DAC_SoftwareTriggerCmd(DAC_Channel_1, ENABLE);

    DAC_SoftwareTriggerCmd(DAC_Channel_2, ENABLE);

}