Problem with DAC stm32f103rd

[dnm_es]

Posted on January 12, 2015 at 18:29

Hello, I would like generate two different signal with the channel 1 and 2 of DAC. I've used two different timer (TIM6 and TIM2) and one DMA address (DAC_DHR12RD_Address    0x40007420). I can generate the signals separate but I try to generate the together (each signal with different DAC) It don't work.

Any ideas?? Thank you

[Tesla DeLorean]

Posted on January 12, 2015 at 18:59

Any ideas??

Like pointing each DMA to the appropriate DAC register?

[dnm_es]

Posted on January 13, 2015 at 08:51

This is my code. I generate one signal with DAC1, this is works, but when I try to generate the signal with DAC2 this is works and the signal of DAC1 stops workings

#define         DAC_DHR12R1_Adress             0x40007408 #define         DAC_DHR12R2_Adress             0x40007414 const           uint8_t                 Escalator8bit[2] = {0x0, 0xFF}; void DMA_Setup(int dec_channel, int8_t DMA_Class, ) {       DMA_Channel_TypeDef* DMA_Channel;                      DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;                             /* DMA operation mode */           DMA_InitStructure.DMA_Priority = DMA_Priority_High;                         /* Specifies the priority for the DMA Channel */           DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;                                /* Specifies if the DMAy Channelx will be used in memory-to-memory transfer */           DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;            /* Specifies whether the Peripheral address register is incremented or not */           DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;                 if(dec_channel==0)                                                      /* If dec_channel=0 I use DAC1 */               {                     DMA_InitStructure.DMA_PeripheralBaseAddr = DAC_DHR12R1_Adress;             DMA_Channel=DMA2_Channel3;                   }               else               {                     DMA_InitStructure.DMA_PeripheralBaseAddr = DAC_DHR12R2_Adress;             DMA_Channel=DMA2_Channel4;               }             DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&Escalator8bit;           DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;           DMA_InitStructure.DMA_BufferSize = 2;           DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;           DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;       DMA_DeInit(DMA_Channel);                          DMA_Init(DMA_Channel, &DMA_InitStructure);                         /* Enable Channely for DMAx */           DMA_Cmd(DMA_Channel, ENABLE);   }