Posted on June 27, 2016 at 17:02 I am trying to transfer data to spi using timer 3 as a time base.
Timer 3 works fine.
Than I am using :
DMA1 Stream2 Channel5 to trigger
memory to SPI2->DR transfers, with no joy.
//TIMER 3 CHANNEL 4 UPDATE
hdma_tim3_ch4_up.Instance = DMA1_Stream2;
hdma_tim3_ch4_up.Init.Channel = DMA_CHANNEL_5;
hdma_tim3_ch4_up.Init.Direction = DMA_MEMORY_TO_PERIPH;
hdma_tim3_ch4_up.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_tim3_ch4_up.Init.MemInc = DMA_MINC_DISABLE;
hdma_tim3_ch4_up.Init.PeriphDataAlignment = DMA_PDATAALIGN_HALFWORD;
hdma_tim3_ch4_up.Init.MemDataAlignment = DMA_MDATAALIGN_HALFWORD;
hdma_tim3_ch4_up.Init.Mode = DMA_CIRCULAR;
hdma_tim3_ch4_up.Init.Priority = DMA_PRIORITY_LOW;
hdma_tim3_ch4_up.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
HAL_DMA_Init(&hdma_tim3_ch4_up);
/* Several peripheral DMA handle pointers point to the same DMA handle.
Be aware that there is only one stream to perform all the requested DMAs. */
__HAL_LINKDMA(htim_base,hdma[TIM_DMA_ID_CC4],hdma_tim3_ch4_up);
__HAL_LINKDMA(htim_base,hdma[TIM_DMA_ID_UPDATE],hdma_tim3_ch4_up);
/**MAIN.c*********************/
DMA_HandleTypeDef hdma_tim3_ch4_up;
HAL_TIM_OC_Start(&htim3, TIM_CHANNEL_4); //start timer 4, works
HAL_DMA_Start_IT(&hdma_tim3_ch4_up, (uint32_t*)&SV.fields.internal_current, (uint32_t*)(&(SPI2->DR)), 1);
__HAL_TIM_ENABLE_DMA(&htim3, TIM_DMA_UPDATE); //TIM1 trigger DMA transfer
Still no data on the spi bus.
