STM32N6 XIP: HPDMA1 Data Transfer Error - ADC1 with TIM2 Trigger to AXISRAM2

[BitkinBitki]

Hi,

Observed Problem

HAL_ADC_Start_DMA() returns HAL_OK, TIM2 starts, ADC begins converting (confirmed via ADC_ISR in debugger), but HPDMA1 Channel 0 immediately raises a DTE (Data Transfer Error), triggering the error callback.

Environment

• MCU: STM32N657X0HXQ
• Boot mode: Two-stage boot — FSBL + XIP Application (external flash via XSPI2, mapped at 0x70100400)
• Toolchain: STM32CubeIDE / GCC
• HAL: STM32CubeN6 (latest)
• Security mode: Full Secure — all code runs in Secure Privileged mode, no NonSecure world
  
  

  Project Description

  This is a minimal reproduction project containing only:

  • ADC1 — single channel (PA8 / INP5), triggered by TIM2 TRGO, DMA circular mode
  • HPDMA1 Channel 0 — linked-list circular mode, PERIPH_TO_MEMORY, ADC1 → AXISRAM2
  • TIM2 — provides ADC trigger at fixed rate (Period=799, no prescaler)

  No ETH, no LwIP, no NPU — deliberately stripped down to isolate the DMA issue.

  ---

  Memory Layout (Linker Script)

  ROM  (XIP)      : 0x70100400,  511K  — code in external flashRAM  (FLEXRAM)  : 0x34000000,  400K  — data/bss/heap/stackAXISRAM2_NC     : 0x34100000,   64K  — DMA node/list/buffer (non-cacheable, NOLOAD)AXISRAM2_C      : 0x34110000,  960K  — (unused in this project)

  DMA Configuration (stm32n6xx_hal_msp.c — HAL_ADC_MspInit)

  c

  /* 1. Build node */
  NodeConfig.NodeType                         = DMA_HPDMA_LINEAR_NODE;
  NodeConfig.Init.Request                     = HPDMA1_REQUEST_ADC1;
  NodeConfig.Init.Direction                   = DMA_PERIPH_TO_MEMORY;
  NodeConfig.Init.SrcInc                      = DMA_SINC_FIXED;
  NodeConfig.Init.DestInc                     = DMA_DINC_INCREMENTED;
  NodeConfig.Init.SrcDataWidth                = DMA_SRC_DATAWIDTH_HALFWORD;
  NodeConfig.Init.DestDataWidth               = DMA_DEST_DATAWIDTH_HALFWORD;
  NodeConfig.Init.SrcBurstLength              = 1;
  NodeConfig.Init.DestBurstLength             = 1;
  NodeConfig.Init.TransferAllocatedPort       = DMA_SRC_ALLOCATED_PORT0 | DMA_DEST_ALLOCATED_PORT1;
  NodeConfig.Init.TransferEventMode           = DMA_TCEM_BLOCK_TRANSFER;
  NodeConfig.Init.Mode                        = DMA_NORMAL;
  NodeConfig.TriggerConfig.TriggerPolarity    = DMA_TRIG_POLARITY_MASKED;
  NodeConfig.SrcSecure                        = DMA_CHANNEL_SRC_SEC;
  NodeConfig.DestSecure                       = DMA_CHANNEL_DEST_SEC;
  HAL_DMAEx_List_BuildNode(&NodeConfig, &Node_HPDMA1_Channel0);
  HAL_DMAEx_List_InsertNode(&List_HPDMA1_Channel0, NULL, &Node_HPDMA1_Channel0);
  HAL_DMAEx_List_SetCircularMode(&List_HPDMA1_Channel0);
  
  /* 2. Init handle */
  handle_HPDMA1_Channel0.Instance                             = HPDMA1_Channel0;
  handle_HPDMA1_Channel0.InitLinkedList.Priority              = DMA_LOW_PRIORITY_HIGH_WEIGHT;
  handle_HPDMA1_Channel0.InitLinkedList.LinkStepMode          = DMA_LSM_FULL_EXECUTION;
  handle_HPDMA1_Channel0.InitLinkedList.LinkAllocatedPort     = DMA_LINK_ALLOCATED_PORT1;
  handle_HPDMA1_Channel0.InitLinkedList.TransferEventMode     = DMA_TCEM_BLOCK_TRANSFER;
  handle_HPDMA1_Channel0.InitLinkedList.LinkedListMode        = DMA_LINKEDLIST_CIRCULAR;
  HAL_DMAEx_List_Init(&handle_HPDMA1_Channel0);
  HAL_DMAEx_List_LinkQ(&handle_HPDMA1_Channel0, &List_HPDMA1_Channel0);
  __HAL_LINKDMA(&hadc1, DMA_Handle, handle_HPDMA1_Channel0);
  
  /* 3. CID isolation — set after Init */
  IsolationConfiginput.CidFiltering = DMA_ISOLATION_ON;
  IsolationConfiginput.StaticCid    = DMA_CHANNEL_STATIC_CID_1;
  HAL_DMA_SetIsolationAttributes(&handle_HPDMA1_Channel0, &IsolationConfiginput);

  Security Configuration (SystemIsolation_Config — called after all peripheral inits)

  c

  __HAL_RCC_RIFSC_CLK_ENABLE();
  
  /* RIMC — ETH1 (not used in this project, kept for completeness) */
  RIMC_master.MasterCID = RIF_CID_1;
  RIMC_master.SecPriv   = RIF_ATTRIBUTE_SEC | RIF_ATTRIBUTE_NPRIV;
  HAL_RIF_RIMC_ConfigMasterAttributes(RIF_MASTER_INDEX_ETH1, &RIMC_master);
  
  /* RIFSC — ADC12 */
  HAL_RIF_RISC_SetSlaveSecureAttributes(RIF_RISC_PERIPH_INDEX_ADC12,
      RIF_ATTRIBUTE_SEC | RIF_ATTRIBUTE_NPRIV);
  
  /* HPDMA1 channel security */
  HAL_DMA_ConfigChannelAttributes(&handle_HPDMA1_Channel0,
      DMA_CHANNEL_SEC | DMA_CHANNEL_PRIV | DMA_CHANNEL_SRC_SEC | DMA_CHANNEL_DEST_SEC);
  
  /* No RISAF configuration — see problem description */

  ---

  MPU Configuration

  c

  /* Attribute 0: Write-Back Non-Transient RW-Allocate (cacheable) */
  /* Attribute 1: Non-Cacheable */
  
  /* Region 0: FLEXRAM     0x34000000–0x3404FFFF  Attr0  RW  XN */
  /* Region 1: AXISRAM2_NC 0x34100000–0x3410FFFF  Attr1  RW  XN  Outer-Shareable */
  /* Region 2: DTCM        0x20000000–0x2001FFFF  Attr0  RW  XN */
  /* Region 3: External Flash 0x70000000–0x73FFFFFF Attr0 RO  X  */
  HAL_MPU_Enable(MPU_PRIVILEGED_DEFAULT);

  I Attached all project files, what's the sollution of this issue?
  
  

[Saket_Om]

Hello @BitkinBitki 

The DMA DTE error is caused by the attempt to perform a transfer with HPDMA from ADC1 to AXISRAM2 using port 1.

For this configuration, only port 0 is authorized