STM32H7S3V8T6 timer triggered DMA

[JShro]

Hi All, 

Trying to setup timer triggered DMA for the STM32H7S3V8T6 micro and cannot seem to get it working

I have tried a number of things and eventually resorted to asking chatGPT but so far no dice... What I want to achieve
1. Timer 1 toggles CH1 output (PA8) this works 
2. I want the DMA to trigger off of the TIMER_CH1 and shove the word into GPIOA->BSRR to toggle the GPIOA pins 0,1,2,3
Here's my main. c code - really stumped as to what is causing this to not work... Any thoughts??

/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file           : main.c
  * @brief          : STM32H7S3 GPIO output driven by TIM1 using GPDMA1 linked-list
  ******************************************************************************
  */
/* USER CODE END Header */

/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include <stm32h7rsxx_hal_dma_ex.h>

/* Private variables ---------------------------------------------------------*/
DMA_HandleTypeDef handle_GPDMA1_Channel0;
TIM_HandleTypeDef htim1;

/* USER CODE BEGIN PV */
ALIGN_32BYTES(uint32_t waveform[] ) = {
    0x00000001, 0x00010000,   // PA0 high / low
    0x00000002, 0x00020000,   // PA1 high / low
    0x00000004, 0x00040000,   // PA2 high / low
    0x00000008, 0x00080000    // PA3 high / low
};
#define WAVEFORM_WORDS (sizeof(waveform)/sizeof(waveform[0]))

DMA_NodeTypeDef Node;
DMA_QListTypeDef List;
/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
static void MPU_Config(void);
static void MX_GPIO_Init(void);
static void MX_GPDMA1_Init(void);
static void MX_TIM1_Init(void);

/* USER CODE BEGIN PFP */
/* USER CODE END PFP */

int main(void)
{
    /* MPU Configuration */
    MPU_Config();

    /* HAL Initialization */
    HAL_Init();
    SystemCoreClockUpdate();

    /* Initialize peripherals */
    MX_GPIO_Init();
    MX_GPDMA1_Init();
    MX_TIM1_Init();

    /* Clean D-Cache for DMA buffer */
    SCB_CleanDCache_by_Addr((uint32_t*)waveform, sizeof(waveform));

    /* Build DMA linked-list node */
    DMA_NodeConfTypeDef NodeConfig;
    NodeConfig.NodeType = DMA_GPDMA_LINEAR_NODE;
    NodeConfig.Init.Request = GPDMA1_REQUEST_TIM1_CH1;
    NodeConfig.Init.Direction = DMA_MEMORY_TO_PERIPH;
    NodeConfig.Init.Mode = DMA_NORMAL;
    NodeConfig.Init.SrcInc = DMA_SINC_INCREMENTED;
    NodeConfig.Init.DestInc = DMA_DINC_FIXED;
    NodeConfig.Init.SrcDataWidth = DMA_SRC_DATAWIDTH_WORD;
    NodeConfig.Init.DestDataWidth = DMA_DEST_DATAWIDTH_WORD;
    NodeConfig.Init.SrcBurstLength = 1;
    NodeConfig.Init.DestBurstLength = 1;
    NodeConfig.Init.TransferEventMode = DMA_TCEM_LAST_LL_ITEM_TRANSFER;
    NodeConfig.DataHandlingConfig.DataExchange = DMA_EXCHANGE_NONE;
    NodeConfig.DataHandlingConfig.DataAlignment = DMA_DATA_RIGHTALIGN_ZEROPADDED;
    NodeConfig.SrcAddress = (uint32_t)waveform;
    NodeConfig.DstAddress = (uint32_t)&GPIOA->BSRR;
    NodeConfig.DataSize = WAVEFORM_WORDS;

    if(HAL_DMAEx_List_BuildNode(&NodeConfig, &Node) != HAL_OK) Error_Handler();
    if(HAL_DMAEx_List_InsertNode_Tail(&List, &Node) != HAL_OK) Error_Handler();
    if(HAL_DMAEx_List_SetCircularMode(&List) != HAL_OK) Error_Handler();

    /* Initialize GPDMA1 channel 0 */
    handle_GPDMA1_Channel0.Instance = GPDMA1_Channel0;
    handle_GPDMA1_Channel0.InitLinkedList.Priority = DMA_LOW_PRIORITY_HIGH_WEIGHT;
    handle_GPDMA1_Channel0.InitLinkedList.LinkStepMode = DMA_LSM_FULL_EXECUTION;
    handle_GPDMA1_Channel0.InitLinkedList.LinkedListMode = DMA_LINKEDLIST_CIRCULAR;
    handle_GPDMA1_Channel0.InitLinkedList.TransferEventMode = DMA_TCEM_LAST_LL_ITEM_TRANSFER;

    if(HAL_DMAEx_List_Init(&handle_GPDMA1_Channel0) != HAL_OK) Error_Handler();
    if(HAL_DMAEx_List_LinkQ(&handle_GPDMA1_Channel0, &List) != HAL_OK) Error_Handler();
    __HAL_LINKDMA(&htim1, hdma[TIM_DMA_ID_CC1], handle_GPDMA1_Channel0);


    /* Start DMA linked-list */
    if(HAL_DMAEx_List_Start_IT(&handle_GPDMA1_Channel0) != HAL_OK) Error_Handler();

    /* Enable TIM1 CC1 DMA request and start timer */
    __HAL_TIM_ENABLE_DMA(&htim1, TIM_DMA_CC1);
    if(HAL_TIM_OC_Start(&htim1, TIM_CHANNEL_1) != HAL_OK) Error_Handler();

    /* Infinite loop */
    while (1) {}
}

/* GPDMA1 Initialization Function */
static void MX_GPDMA1_Init(void)
{
    __HAL_RCC_GPDMA1_CLK_ENABLE();
    HAL_NVIC_SetPriority(GPDMA1_Channel0_IRQn, 0, 0);
    HAL_NVIC_EnableIRQ(GPDMA1_Channel0_IRQn);
}

/* TIM1 Initialization Function */
static void MX_TIM1_Init(void)
{
    TIM_ClockConfigTypeDef sClockSourceConfig = {0};
    TIM_MasterConfigTypeDef sMasterConfig = {0};
    TIM_OC_InitTypeDef sConfigOC = {0};
    TIM_BreakDeadTimeConfigTypeDef sBreakDeadTimeConfig = {0};

    htim1.Instance = TIM1;
    htim1.Init.Prescaler = 0;
    htim1.Init.CounterMode = TIM_COUNTERMODE_UP;
    htim1.Init.Period = 5000;
    htim1.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
    htim1.Init.RepetitionCounter = 0;
    htim1.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
    if(HAL_TIM_Base_Init(&htim1) != HAL_OK) Error_Handler();

    sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
    if(HAL_TIM_ConfigClockSource(&htim1, &sClockSourceConfig) != HAL_OK) Error_Handler();

    if(HAL_TIM_OC_Init(&htim1) != HAL_OK) Error_Handler();

    sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
    sMasterConfig.MasterOutputTrigger2 = TIM_TRGO2_RESET;
    sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
    if(HAL_TIMEx_MasterConfigSynchronization(&htim1, &sMasterConfig) != HAL_OK) Error_Handler();

    sConfigOC.OCMode = TIM_OCMODE_TOGGLE;
    sConfigOC.Pulse = 0;
    sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
    sConfigOC.OCNPolarity = TIM_OCNPOLARITY_HIGH;
    sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
    sConfigOC.OCIdleState = TIM_OCIDLESTATE_RESET;
    sConfigOC.OCNIdleState = TIM_OCNIDLESTATE_RESET;
    if(HAL_TIM_OC_ConfigChannel(&htim1, &sConfigOC, TIM_CHANNEL_1) != HAL_OK) Error_Handler();

    sBreakDeadTimeConfig.OffStateRunMode = TIM_OSSR_DISABLE;
    sBreakDeadTimeConfig.OffStateIDLEMode = TIM_OSSI_DISABLE;
    sBreakDeadTimeConfig.LockLevel = TIM_LOCKLEVEL_OFF;
    sBreakDeadTimeConfig.DeadTime = 0;
    sBreakDeadTimeConfig.BreakState = TIM_BREAK_DISABLE;
    sBreakDeadTimeConfig.BreakPolarity = TIM_BREAKPOLARITY_HIGH;
    sBreakDeadTimeConfig.BreakFilter = 0;
    sBreakDeadTimeConfig.BreakAFMode = TIM_BREAK_AFMODE_INPUT;
    sBreakDeadTimeConfig.Break2State = TIM_BREAK2_DISABLE;
    sBreakDeadTimeConfig.Break2Polarity = TIM_BREAK2POLARITY_HIGH;
    sBreakDeadTimeConfig.Break2Filter = 0;
    sBreakDeadTimeConfig.Break2AFMode = TIM_BREAK_AFMODE_INPUT;
    sBreakDeadTimeConfig.AutomaticOutput = TIM_AUTOMATICOUTPUT_DISABLE;
    if(HAL_TIMEx_ConfigBreakDeadTime(&htim1, &sBreakDeadTimeConfig) != HAL_OK) Error_Handler();

    HAL_TIM_MspPostInit(&htim1);
}

/* GPIO Initialization Function */
static void MX_GPIO_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStruct = {0};
    __HAL_RCC_GPIOA_CLK_ENABLE();

    HAL_GPIO_WritePin(GPIOA, GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3, GPIO_PIN_RESET);
    GPIO_InitStruct.Pin = GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3;
    GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
}

/* MPU Configuration */
static void MPU_Config(void)
{
    MPU_Region_InitTypeDef MPU_InitStruct = {0};
    HAL_MPU_Disable();
    MPU_InitStruct.Enable = MPU_REGION_ENABLE;
    MPU_InitStruct.Number = MPU_REGION_NUMBER0;
    MPU_InitStruct.BaseAddress = 0x0;
    MPU_InitStruct.Size = MPU_REGION_SIZE_4GB;
    MPU_InitStruct.SubRegionDisable = 0x0;
    MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL0;
    MPU_InitStruct.AccessPermission = MPU_REGION_FULL_ACCESS;
    MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_ENABLE;
    MPU_InitStruct.IsShareable = MPU_ACCESS_SHAREABLE;
    MPU_InitStruct.IsCacheable = MPU_ACCESS_NOT_CACHEABLE;
    MPU_InitStruct.IsBufferable = MPU_ACCESS_NOT_BUFFERABLE;
    HAL_MPU_ConfigRegion(&MPU_InitStruct);
    HAL_MPU_Enable(MPU_PRIVILEGED_DEFAULT);
}

/* Error Handler */
void Error_Handler(void)
{
    __disable_irq();
    while (1) {}
}

[Saket_Om]

Hello @JShro 

Please make sur that the dma work fine when trigged by software before adding TIM trigger.