dac dma没输出

lovemykp

程序如下：


void DAC_GPIO_Configuration(void)

{

GPIO_InitTypeDef   GPIO_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5;      //DAC channel1,2

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;

GPIO_Init(GPIOA, &GPIO_InitStructure);

}

void DAC_TriWaveGenerate(void)

{

DMA_InitTypeDef  DMA_InitStructure;

TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;

DAC_InitTypeDef DAC_InitType;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM6|RCC_APB1Periph_DAC, ENABLE); 

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA2, ENABLE);

TIM_TimeBaseStructInit(&TIM_TimeBaseStructure); 

TIM_TimeBaseStructure.TIM_Period = 500;

TIM_TimeBaseStructure.TIM_Prescaler = 0;

TIM_TimeBaseStructure.TIM_ClockDivision = 0;

TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  

TIM_TimeBaseInit(TIM6, &TIM_TimeBaseStructure); 

TIM_SelectOutputTrigger(TIM6, TIM_TRGOSource_Update); 

DAC_InitType.DAC_Trigger=DAC_Trigger_T2_TRGO; //??????? TEN1=0

DAC_InitType.DAC_WaveGeneration=DAC_WaveGeneration_None;//???????

//DAC_InitType.DAC_LFSRUnmask_TriangleAmplitude=DAC_LFSRUnmask_Bit0;//???????

DAC_InitType.DAC_OutputBuffer=DAC_OutputBuffer_Disable ; //DAC1?????? BOFF1=1

        DAC_Init(DAC_Channel_1,&DAC_InitType); //???DAC??1

DMA_DeInit(DMA2_Channel3);

DMA_InitStructure.DMA_PeripheralBaseAddr = DAC_DHR12R1_ADDRESS ;

DMA_InitStructure.DMA_MemoryBaseAddr = (u32)&sanjiao_2V[0];

DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;

DMA_InitStructure.DMA_BufferSize = 128;

DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;

DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;

DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;

DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;

DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;

DMA_InitStructure.DMA_Priority = DMA_Priority_High;

DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;

DMA_Init (DMA2_Channel3, &DMA_InitStructure);

DMA_Cmd(DMA2_Channel3,ENABLE);     

DAC_DMACmd(DAC_Channel_1, ENABLE);

DAC_Cmd(DAC_Channel_1, ENABLE);  //??DAC1

TIM_Cmd(TIM6, ENABLE);  //????TIMx

}

lovemykp

原子求解啊  死这一天了啊

正点原子

回复【2楼】lovemykp:
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我也没用过DAC 的dma模式哦，呵呵