Question
Is there anaybody that have a TIM triggered DMA working Code?
Posted on December 01, 2014 at 22:49
I'm stuck on TIM triggered DMA to SPI.
My DMA Code configuration is as follow: void DMA_Configuration(void) { DMA_InitTypeDef DMA_InitStructure; /* Enable DMA1 clock */ RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE); /* Blank DMA Configuration */ DMA_DeInit(DMA1_Channel1); /* Using the default values at Startup */ DMA_StructInit(&DMA_InitStructure); /*Changes from the default values */ DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)(SPI2->DR); // Address of peripheral the DMA must map to => SPI2 Data Register DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t) TTxBuffer; // Variable to which received data will be stored DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST; // Direction of transfer Memory to Peripheral =Destinatary DMA_InitStructure.DMA_BufferSize = 32; // BufferSize DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; // We don't want to change the SPI2 Data register DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; // We increment Memory DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; // We define Peripheral Data Size as Byte DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte; // We define Memory Data Size as Byte DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; // Circular Mode define DMA_InitStructure.DMA_Priority = DMA_Priority_High; // High Priority DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; // Memory to Memory Disable /* Initialize the DMA */ DMA_Init(DMA1_Channel1, &DMA_InitStructure); /* Enable the DMA transfer half and complete interrupt */ DMA_ITConfig(DMA1_Channel1, DMA_IT_HT, ENABLE); // Half Transfer Interrupt Enable DMA_ITConfig(DMA1_Channel1, DMA_IT_TC, ENABLE); // Full transfer Interrupt Enable /* Enable the DMA TIM Triggered */ TIM_DMACmd(TIM2, TIM_DMA_Trigger, ENABLE); TIM_DMACmd(TIM2, TIM_DMA_Update, ENABLE); /* Enable DMA1 Channel1 */ DMA_Cmd(DMA1_Channel1, ENABLE); } Looking at DMA_CCR1 gives me 0x2AB7 which is ok. Looking at the SPI2_DR I found no value ; i.e. 0 Franck