STM32F334 Burst DMA

[robertj.stuart9]

Posted on July 27, 2016 at 02:33

I have been trying to get the burst DMA working across Timers on the STM32F334 without success.

The reference manual has; The burst DMA mode is permanently enabled (there is no enable bit). A burst DMA operation is started by the first write access into the HRTIM_BDMADR register. It is only necessary to have the DMA controller pointing to the HRTIM_BDMADR register as the destination, in the memory, to the peripheral configuration with the peripheral increment mode disabled (the HRTIM handles internally the data re-routing to the final destination register). I have put together the following code for the DMA DMA_InitTypeDef     DMA_InitStruct; // Enable DMA1 clock RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE); // setup dma to point to HRTIM_BDMADR, using TIMERA dma channel DMA_DeInit(DMA1_Channel3); DMA_InitStruct.DMA_PeripheralBaseAddr    =  (uint32_t)&HRTIM1_COMMON->BDMADR; DMA_InitStruct.DMA_MemoryBaseAddr        = (uint32_t)u32a_burst_dma_buf; DMA_InitStruct.DMA_DIR                    = DMA_DIR_PeripheralDST; DMA_InitStruct.DMA_BufferSize            = BURST_DMA_SIZE; DMA_InitStruct.DMA_PeripheralInc        = DMA_PeripheralInc_Disable; DMA_InitStruct.DMA_MemoryInc            = DMA_MemoryInc_Enable; DMA_InitStruct.DMA_PeripheralDataSize    = DMA_PeripheralDataSize_Word; DMA_InitStruct.DMA_MemoryDataSize        = DMA_MemoryDataSize_Word; DMA_InitStruct.DMA_Mode                    = DMA_Mode_Normal; DMA_InitStruct.DMA_Priority                = DMA_Priority_Low; DMA_InitStruct.DMA_M2M                    = DMA_M2M_Disable; DMA_Init(DMA1_Channel3, &DMA_InitStruct); // DMA1 Channel3 enable DMA_Cmd(DMA1_Channel3, ENABLE); // not sure about this.... HRTIM_DMACmd(HRTIM1, HRTIM_TIMERINDEX_TIMER_A, HRTIM_TIM_DMA_RST, ENABLE); // registers to be updated in burst-dma mode HRTIM_BurstDMAConfig(HRTIM1, HRTIM_TIMERINDEX_TIMER_A, HRTIM_BURSTDMA_CMP1 | HRTIM_BURSTDMA_CMP2 | HRTIM_BURSTDMA_CMP3 | HRTIM_BURSTDMA_CMP4); HRTIM_BurstDMAConfig(HRTIM1, HRTIM_TIMERINDEX_TIMER_B, HRTIM_BURSTDMA_CMP1 | HRTIM_BURSTDMA_CMP2); At runtime u32a_burst_dma_buf[0]        = 100; u32a_burst_dma_buf[1]        = 200; u32a_burst_dma_buf[2]        = 300; u32a_burst_dma_buf[3]        = 400; u32a_burst_dma_buf[4]        = 500; u32a_burst_dma_buf[5]        = 600; // disable DMA DMA_Cmd(DMA1_Channel3, DISABLE); // set the number of bytes to transmit DMA_SetCurrDataCounter(DMA1_Channel3, BURST_DMA_SIZE); // enable DMA DMA_Cmd(DMA1_Channel3, ENABLE); // not sure about this HRTIM1_COMMON->BDMADR=0xFFFF; I the outputs work fine when I update the registers from an interrupt, but it would be better to go thru the DMA. I have not been able to find an examples within STM32CubeMX, so any suggestions would be appreciated.

[robertj.stuart9]

Posted on August 01, 2016 at 07:58

Here is a solution

static void     fv_htim_brust_dma_setup(void) {     DMA_InitTypeDef         DMA_InitStruct;     NVIC_InitTypeDef        NVIC_InitStruct;     // Enable DMA1 clock     RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);     // DMA1 Channel3 enable     DMA_Cmd(DMA1_Channel3, ENABLE);     // setup dma to point to HRTIM_BDMADR, using TIMERA dma channel     DMA_DeInit(DMA1_Channel3);     DMA_InitStruct.DMA_PeripheralBaseAddr    = (uint32_t)&HRTIM1_COMMON->BDMADR;     DMA_InitStruct.DMA_MemoryBaseAddr        = (uint32_t)u32a_burst_dma_buf;     DMA_InitStruct.DMA_DIR                    = DMA_DIR_PeripheralDST;     DMA_InitStruct.DMA_BufferSize            = BURST_DMA_SIZE;     DMA_InitStruct.DMA_PeripheralInc        = DMA_PeripheralInc_Disable;     DMA_InitStruct.DMA_MemoryInc            = DMA_MemoryInc_Enable;     DMA_InitStruct.DMA_PeripheralDataSize    = DMA_PeripheralDataSize_Word;     DMA_InitStruct.DMA_MemoryDataSize        = DMA_MemoryDataSize_Word;     DMA_InitStruct.DMA_Mode                    = DMA_Mode_Normal;     DMA_InitStruct.DMA_Priority                = DMA_Priority_Low;     DMA_InitStruct.DMA_M2M                    = DMA_M2M_Disable;     DMA_Init(DMA1_Channel3, &DMA_InitStruct);     // registers to be updated in burst-dma mode     HRTIM_BurstDMAConfig(HRTIM1, HRTIM_TIMERINDEX_TIMER_A, HRTIM_BURSTDMA_CMP1 | HRTIM_BURSTDMA_CMP2 | HRTIM_BURSTDMA_CMP3 | HRTIM_BURSTDMA_CMP4);     HRTIM_BurstDMAConfig(HRTIM1, HRTIM_TIMERINDEX_TIMER_B, HRTIM_BURSTDMA_CMP1 | HRTIM_BURSTDMA_CMP2);     // Enable DMA1 channel1 IRQ Channel     NVIC_InitStruct.NVIC_IRQChannel                     = DMA1_Channel3_IRQn;     NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority     = 0;     NVIC_InitStruct.NVIC_IRQChannelSubPriority             = 0;     NVIC_InitStruct.NVIC_IRQChannelCmd                     = ENABLE;     NVIC_Init(&NVIC_InitStruct); } In your control-loop     // diable burst dma mode before updating registers     NVIC_DisableIRQ(HRTIM1_TIMA_IRQn);     // update the registers into the dma array     u32a_burst_dma_buf[0]        = u16_S12_lo_FET_Ton;     u32a_burst_dma_buf[1]        = u16_S12_lo_FET_Toff;     u32a_burst_dma_buf[2]        = u16_ADC_trigger;     u32a_burst_dma_buf[3]        = u16_ZDC1_blanking;     u32a_burst_dma_buf[4]        = u16_S12_hi_FET_Ton;     u32a_burst_dma_buf[5]        = u16_S12_hi_FET_Toff;     // enable burst dma mode to update all registers at once     NVIC_EnableIRQ(HRTIM1_TIMA_IRQn);

[J L]

Posted on November 04, 2017 at 08:00

Hi S.r ,

Do you have a full sample HRTIM code with DMA? I stuck on HRTIM register updated by DMA.

Thanks,

J.L