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  • STM32F107的DAC配置

    void DAC_INIT()
    {
    // //SystemInit();
    // GPIO_InitTypeDef GPIO_InitStructure;
    // DAC_InitTypeDef DAC_InitType;
    // SystemInit();
    //// RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE ); //ʹÄÜPORTAͨµÀʱÖÓ
    // RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_AFIO, ENABLE ); //ʹÄÜPORTAͨµÀʱÖÓ
    // RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE ); //ʹÄÜDACͨµÀʱÖÓ

    // GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4; // ¶Ë¿ÚÅäÖÃ
    //// GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; //Ä£ÄâÊäÈë
    //GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //Ä£ÄâÊäÈë
    // GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    // GPIO_Init(GPIOA, &GPIO_InitStructure);
    // GPIO_SetBits(GPIOA,GPIO_Pin_4) ;//PA.4 Êä³ö¸ß
    //
    // DAC_InitType.DAC_Trigger=DAC_Trigger_None; //²»Ê¹Óô¥·¢¹¦ÄÜ TEN1=0
    // DAC_InitType.DAC_WaveGeneration=DAC_WaveGeneration_None;//²»Ê¹Óò¨Ðη¢Éú
    // DAC_InitType.DAC_LFSRUnmask_TriangleAmplitude=DAC_LFSRUnmask_Bit0;//ÆÁ±Î¡¢·ùÖµÉèÖÃ
    // DAC_InitType.DAC_OutputBuffer=DAC_OutputBuffer_Disable ; //DAC1Êä³ö»º´æ¹Ø±Õ BOFF1=1
    // DAC_Init(DAC_Channel_1,&DAC_InitType); //³õʼ»¯DACͨµÀ1

    // DAC_Cmd(DAC_Channel_1, ENABLE); //ʹÄÜDAC1
    //
    // DAC_SetChannel1Data(DAC_Align_12b_R, 0); //12λÓÒ¶ÔÆëÊý¾Ý¸ñʽÉèÖÃDACÖµ

    GPIO_InitTypeDef GPIO_InitStructure;
    DAC_InitTypeDef DAC_InitStructure;
    // DMA_InitTypeDef DMA_InitStructure;
    //??GPIOA
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
    //??DAC1??
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);
    //dac??pa4????
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
    GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    DAC_InitStructure.DAC_Trigger = DAC_Trigger_None;//DAC_Trigger_T2_TRGO;
    DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;
    //DAC_InitStructure.DAC_LFSRUnmask_TriangleAmplitude = DAC_TriangleAmplitude_4095;
    DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Enable;//??DAC????
    DAC_Init(DAC_Channel_1, &DAC_InitStructure);
    DAC_Cmd(DAC_Channel_1, ENABLE);
    //DAC_SoftwareTriggerCmd(DAC_Channel_1,ENABLE);

    DAC_SetChannel1Data(DAC_Align_12b_R,0);//12????,??0
    //DAC_SoftwareTriggerCmd(DAC_Channel_1,ENABLE);
    }

    DAC_InitType.DAC_OutputBuffer这里非常重要,如果设置为关闭,则实际电路在输出里加下拉电阻会出错,这里设置成使能才不会受到接地电阻的影响

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  • 原文地址:https://www.cnblogs.com/pacexdong/p/11415323.html
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