Solved
Make the STM32H7 example "DMAMUX_RequestGen" work with DMA1 instead of BDMA
Hi,
The example DMAMUX_RequestGen works perfectly on my STM32H755 board and now I'm trying to modify it so it uses the DMA1 instead of the BDMA. I need that because at the end I would like to trigger a SPI5 RX.
Unfortunately I cannot make it work, that means I don't see the output pin toggling when EXTI0 is changing. I have no error during the configuration. And no DMA error neither.
Here is what I changed form the example:
- Use SRAM1 instead of SRAM4 for the DMA (SRC_Buffer_LED1_Toggle array)
- Use DMA1 instance instead of BDMA
- Use DMAMUX1 instead of DMAMUX2
- Enable DMA1 and SRAM1 clocks
What did I forget? What shall I check?
This is the source code:
/*Buffer location and size should aligned to cache line size (32 bytes) */
/* Use SRAM4 for BDMA, or SRAM1 for DMA1 */
#if defined(__ICCARM__)
#ifdef USE_BDMA
#pragma location = 0x38000000
#else
#pragma location = 0x30000000
#endif
uint32_t SRC_Buffer_LED1_Toggle[2] =
{
0, /*Value for LED 1 ON */
GPIO_PIN_10 /*Value for LED 1 OFF */
};
#endif
static void init_and_start_exti0_dma()
{
HAL_StatusTypeDef ret;
HAL_DMA_MuxRequestGeneratorConfigTypeDef dmamux_ReqGenParams = {0};
/* Configure the PF10 pin */
__HAL_RCC_GPIOF_CLK_ENABLE();
GPIO_InitTypeDef gpio_init_structure;
gpio_init_structure.Mode = GPIO_MODE_OUTPUT_PP;
gpio_init_structure.Pull = GPIO_PULLUP;
gpio_init_structure.Speed = GPIO_SPEED_FREQ_HIGH;
gpio_init_structure.Pin = GPIO_PIN_10;
HAL_GPIO_Init(GPIOF, &gpio_init_structure);
HAL_GPIO_WritePin(GPIOF, GPIO_PIN_10, GPIO_PIN_SET);
/*##-2- Configure the DMA ##################################################*/
/* Enable BDMA and DMA1 clock */
#ifdef USE_BDMA
__HAL_RCC_BDMA_CLK_ENABLE();
#else
__HAL_RCC_D2SRAM1_CLK_ENABLE();
__HAL_RCC_DMA1_CLK_ENABLE();
#endif
/* Configure the DMA handler for Transmission process */
/* DMA mode is set to circular for an infinite DMA transfer */
#ifdef USE_BDMA
DMA_Handle.Instance = BDMA_Channel0;
DMA_Handle.Init.Request = BDMA_REQUEST_GENERATOR0;
#else
DMA_Handle.Instance = DMA1_Stream0;
DMA_Handle.Init.Request = DMA_REQUEST_GENERATOR0;
#endif
DMA_Handle.Init.Direction = DMA_MEMORY_TO_PERIPH;
DMA_Handle.Init.PeriphInc = DMA_PINC_DISABLE;
DMA_Handle.Init.MemInc = DMA_MINC_ENABLE;
DMA_Handle.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;
DMA_Handle.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;
DMA_Handle.Init.Mode = DMA_CIRCULAR;
DMA_Handle.Init.Priority = DMA_PRIORITY_LOW;
DMA_Handle.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
DMA_Handle.Init.FIFOThreshold = DMA_FIFO_THRESHOLD_FULL;
DMA_Handle.Init.MemBurst = DMA_MBURST_SINGLE;
DMA_Handle.Init.PeriphBurst = DMA_PBURST_SINGLE;
/* Initialize the DMA with for Transmission process */
ret = HAL_DMA_Init(&DMA_Handle);
assert(ret == HAL_OK);
/* Select Callbacks functions called after Transfer complete and Transfer error */
HAL_DMA_RegisterCallback(&DMA_Handle, HAL_DMA_XFER_CPLT_CB_ID, NULL);
HAL_DMA_RegisterCallback(&DMA_Handle, HAL_DMA_XFER_ERROR_CB_ID, HAL_TransferError);
/* NVIC configuration for DMA transfer complete interrupt*/
#ifdef USE_BDMA
HAL_NVIC_SetPriority(BDMA_Channel0_IRQn, 0, 1);
HAL_NVIC_EnableIRQ(BDMA_Channel0_IRQn);
#else
HAL_NVIC_SetPriority(DMA1_Stream0_IRQn, 0, 1);
HAL_NVIC_EnableIRQ(DMA1_Stream0_IRQn);
#endif
/*##-4- Configure and enable the EXTI0 used as DMA external request signal #####*/
EXTI0_IRQHandler_Config();
/*##-3- Configure and enable the DMAMUX Request generator ####################*/
#ifdef USE_BDMA
dmamux_ReqGenParams.SignalID = HAL_DMAMUX2_REQ_GEN_EXTI0; /* External request signal is EXTI0 signal */
#else
dmamux_ReqGenParams.SignalID = HAL_DMAMUX1_REQ_GEN_EXTI0; /* External request signal is EXTI0 signal */
#endif
dmamux_ReqGenParams.Polarity = HAL_DMAMUX_REQ_GEN_FALLING; /* External request signal edge is Falling */
dmamux_ReqGenParams.RequestNumber = 1; /* 1 requests on each edge of the external request signal */
ret = HAL_DMAEx_ConfigMuxRequestGenerator(&DMA_Handle, &dmamux_ReqGenParams);
assert(ret == HAL_OK);
/* NVIC configuration for DMAMUX request generator overrun errors*/
#ifdef USE_BDMA
HAL_NVIC_SetPriority(DMAMUX2_OVR_IRQn, 0, 1);
HAL_NVIC_EnableIRQ(DMAMUX2_OVR_IRQn);
#else
HAL_NVIC_SetPriority(DMAMUX1_OVR_IRQn, 0, 1);
HAL_NVIC_EnableIRQ(DMAMUX1_OVR_IRQn);
#endif
ret = HAL_DMAEx_EnableMuxRequestGenerator(&DMA_Handle);
assert(ret == HAL_OK);
/*##-5- Start the DMA transfer ################################################*/
/* DMA source buffer is SRC_BUFFER_LED1_TOGGLE containing values to be written
to GPIOF ODR register in order to turn LED1 On/Off each time comes a request from the DMAMUX request generator */
ret = HAL_DMA_Start_IT(&DMA_Handle, (uint32_t)SRC_Buffer_LED1_Toggle, (uint32_t)&GPIOF->ODR, 2);
assert(ret == HAL_OK);
}Thank you for any help.