F767 DAC+DMA输出1Khz正弦波，为什么输出不了求帮助指点，不胜感激

铭贤 · 发表于 2019-8-8 18:36:09

您好，想请教一下

如果想测量1.5V~1.65V的电压
vref+接1.65v，GND接1.5V可行吗？

GND接1.5V会不会影响其他模块？

13372533333 · 发表于 2019-8-8 20:46:36

兄弟，怎么没看到你配置DAC？看图片你好像只配置了定时器和DMA吧，这种生成正旋波的帖子，论坛很多，你可以搜索一下，看看别人怎么配置的。

mumumumu · 发表于 2019-8-8 21:42:52

13372533333 发表于 2019-8-8 20:46
兄弟，怎么没看到你配置DAC？看图片你好像只配置了定时器和DMA吧，这种生成正旋波的帖子，论坛很多，你可以 ...

配置了，图片选了4张貌似只能上传2张。。我也很尴尬。下面有完整工程，可否打开帮看一下。

mumumumu · 发表于 2019-8-8 21:46:42

剩下的两张图，我总感觉我缺少了啥，麻烦大家指出我漏了啥或错在哪里

mumumumu · 发表于 2019-8-8 22:21:14

没贴出来的DAC部分；大部分直接在例程上改的配置

DAC_HandleTypeDef DAC1_Handler; //DAC¾ä±ú
void DAC1_Init(void)
{
DAC_ChannelConfTypeDef DACCH1_Config;
DAC1_Handler.Instance=DAC;
HAL_DAC_Init(&DAC1_Handler);                //3õê¼»ˉDAC

DACCH1_Config.DAC_Trigger=DAC_TRIGGER_T2_TRGO;                            //2»ê1óÃ′￥·￠1|Äü
DACCH1_Config.DAC_OutputBuffer=DAC_OUTPUTBUFFER_DISABLE;             //DAC1êä3ö»o3å1Ø±Õ
HAL_DAC_ConfigChannel(&DAC1_Handler,&DACCH1_Config,DAC_CHANNEL_1);  //DACí¨μà1ÅäÖÃ
HAL_DAC_Start(&DAC1_Handler,DAC_CHANNEL_1);  //¿aÆôDACí¨μà1

}
void HAL_DAC_MspInit(DAC_HandleTypeDef* hdac)
{
GPIO_InitTypeDef GPIO_Initure;
__HAL_RCC_DAC_CLK_ENABLE();          //ê1ÄüDACê±Öó
__HAL_RCC_GPIOA_CLK_ENABLE(); //¿aÆôGPIOAê±Öó

GPIO_Initure.Pin=GPIO_PIN_4;          //PA4
GPIO_Initure.Mode=GPIO_MODE_ANALOG;    //Ä￡Äa
GPIO_Initure.Pull=GPIO_NOPULL;       //2»′øéÏÏÂà-
HAL_GPIO_Init(GPIOA,&GPIO_Initure);
}

void DAC1_Set_Vol(u16 vol)
{
double temp=vol;
temp/=1000;
temp=temp*4096/3.3;
HAL_DAC_SetValue(&DAC1_Handler,DAC_CHANNEL_1,DAC_ALIGN_12B_R,temp);    //12Î»óò¶ÔÆëêy¾Y¸ñê½éèÖÃDACÖμ
}

mumumumu · 发表于 2019-8-9 08:59:57

*DAC配置部分*
DAC_HandleTypeDef DAC1_Handler;//DAC¾ä±ú
void DAC1_Init(void)
{
DAC_ChannelConfTypeDef DACCH1_Config;

DAC1_Handler.Instance=DAC;
HAL_DAC_Init(&DAC1_Handler);

DACCH1_Config.DAC_Trigger=DAC_TRIGGER_T2_TRGO;
DACCH1_Config.DAC_OutputBuffer=DAC_OUTPUTBUFFER_DISABLE;
HAL_DAC_ConfigChannel(&DAC1_Handler,&DACCH1_Config,DAC_CHANNEL_1);

HAL_DAC_Start(&DAC1_Handler,DAC_CHANNEL_1);  //¿aÆôDACí¨μà1
}

void HAL_DAC_MspInit(DAC_HandleTypeDef* hdac)
{
GPIO_InitTypeDef GPIO_Initure;
__HAL_RCC_DAC_CLK_ENABLE();
__HAL_RCC_GPIOA_CLK_ENABLE();

GPIO_Initure.Pin=GPIO_PIN_4;
GPIO_Initure.Mode=GPIO_MODE_ANALOG;
GPIO_Initure.Pull=GPIO_NOPULL;
HAL_GPIO_Init(GPIOA,&GPIO_Initure);
}

//éèÖÃí¨μà1êä3öμçÑ1
//vol:0~3300,′ú±í0~3.3V
void DAC1_Set_Vol(u16 vol)
{
double temp=vol;
temp/=1000;
temp=temp*4096/3.3;
HAL_DAC_SetValue(&DAC1_Handler,DAC_CHANNEL_1,DAC_ALIGN_12B_R,temp);
}
*定时器部分*
TIM_HandleTypeDef TIM2_Handler;    //¶¨ê±Æ÷¾ä±ú
//¶¨ê±Æ÷òç3öê±¼ä¼ÆËã·½·¨:Tout=((arr+1)*(psc+1))/Ft us.  10*108/108M=0.00001       0.001 1/0.001=1000
void TIM2_Init(u16 arr,u16 psc)
{
TIM2_Handler.Instance=TIM2;
TIM2_Handler.Init.Prescaler=psc;
TIM2_Handler.Init.CounterMode=TIM_COUNTERMODE_UP;
TIM2_Handler.Init.Period=arr;
TIM2_Handler.Init.ClockDivision=TIM_CLOCKDIVISION_DIV1;
HAL_TIM_Base_Init(&TIM2_Handler);
HAL_TIM_Base_Start_IT(&TIM2_Handler);
__HAL_TIM_URS_ENABLE(&TIM2_Handler);

}
void HAL_TIM_Base_MspInit(TIM_HandleTypeDef *htim)
{
if(htim->Instance==TIM2)
{
__HAL_RCC_TIM2_CLK_ENABLE();
HAL_NVIC_SetPriority(TIM2_IRQn,1,3);
HAL_NVIC_EnableIRQ(TIM2_IRQn);
}
}

void TIM2_IRQHandler(void)
{
HAL_TIM_IRQHandler(&TIM2_Handler);
}

void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
if(htim==(&TIM2_Handler))
{
      LED1_Toggle;       //LED0·′×a
}
}

*DMA配置部分*
DMA_HandleTypeDef  DAC1TxDMA_Handler;
extern DAC_HandleTypeDef DAC1_Handler;

void MYDMA_Config(DMA_Stream_TypeDef *DMA_Streamx,u32 chx)
{
if((u32)DMA_Streamx>(u32)DMA2)
{
      __HAL_RCC_DMA2_CLK_ENABLE();
}else
{
      __HAL_RCC_DMA1_CLK_ENABLE();
}

__HAL_LINKDMA(&DAC1_Handler,DMA_Handle1,DAC1TxDMA_Handler);

//Tx DMAÅäÖÃ
DAC1TxDMA_Handler.Instance=DMA_Streamx;
DAC1TxDMA_Handler.Init.Channel=chx;
DAC1TxDMA_Handler.Init.Direction=DMA_MEMORY_TO_PERIPH;
DAC1TxDMA_Handler.Init.PeriphInc=DMA_PINC_DISABLE;
DAC1TxDMA_Handler.Init.MemInc=DMA_MINC_ENABLE;
DAC1TxDMA_Handler.Init.PeriphDataAlignment=DMA_PDATAALIGN_HALFWORD;
DAC1TxDMA_Handler.Init.MemDataAlignment=DMA_MDATAALIGN_HALFWORD;
DAC1TxDMA_Handler.Init.Mode=DMA_CIRCULAR;
DAC1TxDMA_Handler.Init.Priority=DMA_PRIORITY_MEDIUM;
DAC1TxDMA_Handler.Init.FIFOMode=DMA_FIFOMODE_DISABLE;
DAC1TxDMA_Handler.Init.FIFOThreshold=DMA_FIFO_THRESHOLD_FULL;
DAC1TxDMA_Handler.Init.MemBurst=DMA_MBURST_SINGLE;
DAC1TxDMA_Handler.Init.PeriphBurst=DMA_PBURST_SINGLE;

HAL_DMA_DeInit(&DAC1TxDMA_Handler);
HAL_DMA_Init(&DAC1TxDMA_Handler);
}

*main部分*
#define DAC_SIN_SIZE 100 //·￠Ëíêy¾Y3¤¶è,×îoÃμèóúsizeof(TEXT_TO_SEND)+2μÄÕûêy±¶.

u32 DAC_SIN_BUF[DAC_SIN_SIZE];  //·￠Ëíêy¾Y»o3åÇø

#define PI 3.1415962

extern DAC_HandleTypeDef DAC1_Handler;          //DAC??
extern DMA_HandleTypeDef DAC1TxDMA_Handler;    //DMA??
extern TIM_HandleTypeDef TIM2_Handler;          //?????

//2úéúÕyÏò2¨oˉDòáD￡¬¸ù¾YDAC_SIN_SIZEéú3é¡￡
void dac_creat_sin_buf(void)
{
u8 i;
float inc=2*PI/DAC_SIN_SIZE;       //¼ÆËãÔöá¿￡¨ò»¸öÖüÆúDAC_SIN_BUF¸öμã￡©
float outdata=0;
for(i=0;i<DAC_SIN_SIZE;i++)
{
      outdata=2047*(1+sin(inc*i)); //¼ÆËãòÔdots¸öμãÎaÖüÆúμÄÃ¿¸öμãμÄÖμ￡¬·Å′ó2048±¶￡¬2￠Æ«òÆμ½ÕyêyÇøóò¡￡
      printf("%f\r\n",outdata);
      DAC_SIN_BUF=outdata;
}
}

int main(void)
{
u16 i=0;
Cache_Enable();
HAL_Init();
Stm32_Clock_Init(432,25,2,9);
delay_init(216);
uart_init(115200);
LED_Init();
KEY_Init();
SDRAM_Init();
LCD_Init();
TIM2_Init(9,108-1);  // òç3öê±¼ä*êy¾Y¸öêy=ÕyÏò2¨ÆμÂê¡￡ òç3öê±¼ä=(arr+1)*(psc+1)/¶¨ê±Æ÷ê±Öó
dac_creat_sin_buf();
DAC1_Init();
MYDMA_Config(DMA1_Stream5,DMA_CHANNEL_7);
POINT_COLOR=RED;
LCD_ShowString(30,50,200,16,16,"Apollo STM32F4/F7");
LCD_ShowString(30,70,200,16,16,"DMA TEST");
LCD_ShowString(30,90,200,16,16,"ATOM@ALIENTEK");
LCD_ShowString(30,110,200,16,16,"2016/1/24");
LCD_ShowString(30,130,200,16,16,"KEY0:Start");

POINT_COLOR=BLUE;
HAL_DAC_Start_DMA(&DAC1_Handler,DAC_CHANNEL_1, DAC_SIN_BUF, DAC_SIN_SIZE, DAC_ALIGN_12B_R);
   while(1)
{
i++;
delay_ms(10);
if(i==20)
{
LED0_Toggle;//ìáê¾Ïμí3ÕyÔúÔËDD
i=0;
}
}
}

13372533333 · 发表于 2019-8-9 13:16:59

本帖最后由 13372533333 于 2019-8-9 13:19 编辑

你这个DMA传输数据，只配置内存到外设，没有把外设地址加进去吧，数据都输出不到DAC，怎么可能会有波形出来。

mumumumu · 发表于 2019-8-9 18:59:27

13372533333 发表于 2019-8-9 13:16
你这个DMA传输数据，只配置内存到外设，没有把外设地址加进去吧，数据都输出不到DAC，怎么可能会有波形出来 ...

HAL_DAC_Start_DMA(&DAC1_Handler,DAC_CHANNEL_1, DAC_SIN_BUF, DAC_SIN_SIZE, DAC_ALIGN_12B_R); 是这里吗？或者应该怎么设置？

13372533333 · 发表于 2019-8-12 08:04:23

mumumumu 发表于 2019-8-9 18:59
HAL_DAC_Start_DMA(&DAC1_Handler,DAC_CHANNEL_1, DAC_SIN_BUF, DAC_SIN_SIZE, DAC_ALIGN_12B_R); 是 ...

DMA_DeInit(DMA1_Stream5);
DMA_InitStructure.DMA_Channel = DMA_Channel_7;
DMA_InitStructure.DMA_PeripheralBaseAddr = 0x40007408;
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&sinTable;
DMA_InitStructure.DMA_BufferSize = tableSize;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
DMA_InitStructure.DMA_MemoryDataSize = DMA_PeripheralDataSize_HalfWord;
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);

13372533333 · 发表于 2019-8-12 08:04:49

DMA_DeInit(DMA1_Stream5);
DMA_InitStructure.DMA_Channel = DMA_Channel_7;
DMA_InitStructure.DMA_PeripheralBaseAddr = 0x40007408;
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&sinTable;
DMA_InitStructure.DMA_BufferSize = tableSize;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
DMA_InitStructure.DMA_MemoryDataSize = DMA_PeripheralDataSize_HalfWord;
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);