设置好DMA与ADC的配置，但DMA启动不了。

kenluo

ADC的配置如下： 
void AdcInitial(void)
{
 RCC->APB2RSTR |= (1<<9);//Reset ADC1
 RCC->APB2RSTR &= ~(1<<9); //Clear ADC1 Reset
 
 RCC->APB2ENR |= (1<<2); //PortA Enable
 RCC->APB2ENR |= (1<<0); //AFIO Enable
 RCC->APB2ENR |= (1<<9); //ADC1 Enable

 RCC->CFGR &= 0xFFFF3FFF;//Clear ADCPRE
 RCC->CFGR |= (2<<14); //Set ADCPRE 6 Prescaler

 GPIOA->CRL &= 0xFFFFFFF0;//PoartA0 Anolog Input
 GPIOA->CRL &= 0xFFFFFF0F;//PoartA1 Anolog Input
 GPIOA->CRL &= 0xFFFFF0FF;//PoartA2 Anolog Input

}

void Adc1Set(void)
{
 ADC1->CR1 &=0xFFF0FFFF; //DualMod == 0000
 ADC1->CR1 |= (1<<8);//Scan Enable
 ADC1->CR2 |= (1<<1);//Cont = 1
 ADC1->CR2 &=~(1<<20);//Disable ExtTrig
 ADC1->CR2 &= ~(1<<11);//Right Align

 ADC1->SQR1 &= 0xFF0FFFFF;//Clear Regular Channel Sequence Length
 ADC1->SQR1 |= (2<<20);// Set Regular Channel Sequence Length to 3

 ADC1->CR2 |= (1<<23);//Temperature and Vrefint Enable

 ADC1->CR2 |= (7<<17);//Swstart Mode

 ADC1->SMPR2 &=0xFFFFFE00;//SMPR2 1.5cycle
 ADC1->SMPR2 |= (7<<0); //239.5Cycle
 ADC1->SMPR2 |= (7<<3); //239.5Cycle
 ADC1->SMPR2 |= (7<<6); //239.5Cycle

 ADC1->SQR3 &= 0xFFFF8000;
 ADC1->SQR3 |= (0<<0);
 ADC1->SQR3 |= (1<<5);
 ADC1->SQR3 |= (2<<10);
 

 ADC1->CR2 |= (1<<0);//Enable Converter
 ADC1->CR2 |= (1<<8);//Enable DMA

 ADC1->CR2 |= (1<<3);   //RstCal
 while(ADC1->CR2&(1<<3));
 ADC1->CR2 |= (1<<2); //Cal
 while(ADC1->CR2&(1<<2));

}

DMA配置如下：
u32 DmaAdcValue[]= {1,2,3};//

void DmaInitial(void)
{
 RCC->AHBENR |= (1<<0); 
}

void DMA1_Channel1ConfigureSet(void)
{
 u32 DRAdress =0;

 
 DMA1_Channel1->CNDTR = 3; //Transfer Count
 DRAdress = (u32)(&ADC1->DR);//ADC1->DR;
 DMA1_Channel1->CPAR = DRAdress ;   //Peripheral Address
 DMA1_Channel1->CMAR = (u32)(&DmaAdcValue[0]);  //Memory Address
 
 DMA1_Channel1->CCR &= ~(1<<14); //Disable Mem2Mem Bit

 DMA1_Channel1->CCR &= 0xCFFF;  //Clear Priority
 DMA1_Channel1->CCR |= (2<<12); //Hight Priority

 DMA1_Channel1->CCR &= 0xF3FF; //Clear Memory Size Bit
 DMA1_Channel1->CCR |= (1<<10);//Memory Size 16 Bit

 DMA1_Channel1->CCR &= 0xFCFF; //Clear Peripheral Size Bit
 DMA1_Channel1->CCR |= (1<<8);//Peripheral Size 16Bit

 DMA1_Channel1->CCR |= (1<<7); //Memory Increment Enable
 DMA1_Channel1->CCR &= ~(1<<6); //Peripheral Increment Disable

 DMA1_Channel1->CCR |= (1<<5); //Circular Enable
 DMA1_Channel1->CCR &= ~(1<<4); //Data Transfer From Peripheral

 DMA1_Channel1->CCR |= (1<<0);//Enable DMA

}

我的想法是：ADC1扫描，连续转换模式，启动ADC1的DMA。用DMA的第一通道，把ADC1 CH0，CH1，CH2通道的值读到DmaAdcValue[]数组里面。配置好上面的参数，但读DmaAdcValue[]数组里面的值，一直没有更新，好像DMA一直没有启动一样，是否这种的配置正确吗？还是其它的问题导致？

正点原子

回复【楼主位】kenluo:
---------------------------------
应该是你的DMA这样设置只会动作一次.
请参考我的串口DMA实验.
//开启一次DMA传输
void MYDMA_Enable(DMA_Channel_TypeDef*DMA_CHx)
{
DMA_CHx->CCR&=~(1<<0);       //关闭DMA传输 
DMA_CHx->CNDTR=DMA1_MEM_LEN; //DMA1,传输数据量 
DMA_CHx->CCR|=1<<0;          //开启DMA传输
}   
这样才可以多次启动,每调用一次,启动一次.

kenluo

回复【2楼】正点原子:

---------------------------------
应该是DMA还没有启动，因为数组里面DmaAdcValue[]= {1,2,3}初始化的值,用软件仿真时看到的全局变量一直没有改变. 按你的方法每调动一次DMA，就使能一次，问题照旧。有点奇怪。

正点原子

论坛搜索"adc dma"看看别人的程序吧.