Hi @mbarg.1
thank you so much for your response and supporting me. Yes, I have update few inputs in "lwipopts.h" file but i am currently not sure about the configuration. It would be really appreciated if there is any standard configuration for Lwip Ethernet that works with stm32f746NGHS discovery board. Pleae
/* USER CODE BEGIN 1 */
#define LWIP_TCP 1
#define LWIP_NETCONN 1
//#define LWIP_DHCP 1
#define LWIP_DNS 1 // handy for MQTT later
#define LWIP_NETIF_HOSTNAME 1
#define LWIP_MDNS_RESPONDER 1 // mDNS (.local)
#define LWIP_IGMP 1 // required for IPv4 multicast 224.0.0.251
#define LWIP_NETBIOSNS 1 // optional: Windows NetBIOS name
#define LWIP_NUM_NETIF_CLIENT_DATA 1 /* required by mDNS */
#define LWIP_SO_RCVTIMEO 1
#define LWIP_AUTOIP 0
#define LWIP_DHCP_AUTOIP_COOP 0
#define LWIP_MQTT 1
#define TCPIP_THREAD_STACKSIZE 3072
#define DEFAULT_THREAD_STACKSIZE 1536
#define MEM_SIZE 16*1024
#define PBUF_POOL_SIZE 16
#define PBUF_POOL_BUFSIZE 1536
#define LWIP_RAM_HEAP_POINTER 0x2004C140
/* USER CODE END 1 */
I am adding screenshots ioc information and manual changes in code for reference for better understanding.
I assume DMA Rx and Tx buffer and DTCM non sharable and non cacheable are causing problem.
Stm32f746 host device updated NET link up but when i tried to ping on laptop I get host unreachable. this is due to DMA bufferes are not recognized or dont have memory is not handled properly.
Any further suggestions would be really appreciated.
Good day!
I am facing a critical issue integrating Ethernet (LWIP) and TouchGFX on my STM32F746NGH Discovery board.
The Problem:
My PC cannot reach the STM32 board over Ethernet. ARP requests fail, resulting in "host unreachable." I understand this is likely due to incorrect memory configuration for the Ethernet DMA and buffers, which require non-cacheable memory regions. I am not familiar with memory mapping before and this helps me to learn and understand how it works in future. I am really appreciated for your valuable inputs.
My Challenge:
When I modify the MPU settings and linker script to define non-cacheable memory for Ethernet, one of two things happens:
The Ethernet network works (DHCP or static IP), but TouchGFX freezes.
The system crashes with a Hard Fault error.
I need to define separate, non-overlapping memory regions for Ethernet DMA/buffers (non-cacheable) and TouchGFX framebuffers (cacheable) without causing conflicts.
Could a technical expert please help me resolve this memory mapping issue? I would greatly appreciate guidance on the correct MPU configuration and linker script adjustments. The below script doesn't create any hardfault handler erros and no TouchGFX freeze or hand issue but I can't communicate Ethernet(LWIP).
void MPU_Config(void)
{
MPU_Region_InitTypeDef MPU_InitStruct = {0};
HAL_MPU_Disable();
/* SDRAM 0xC0000000 (8 MB): Normal, cacheable, write-through (C=1, B=0) */
MPU_InitStruct.Enable = MPU_REGION_ENABLE;
MPU_InitStruct.Number = MPU_REGION_NUMBER0;
MPU_InitStruct.BaseAddress = 0xC0000000;
MPU_InitStruct.Size = MPU_REGION_SIZE_8MB;
MPU_InitStruct.SubRegionDisable = 0x00;
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_CACHEABLE; /* C=1 */
MPU_InitStruct.IsBufferable = MPU_ACCESS_NOT_BUFFERABLE; /* B=0 -> WT */
HAL_MPU_ConfigRegion(&MPU_InitStruct);
/* QSPI 0x90000000 (16 MB): Normal, cacheable (write-through is fine too) */
MPU_InitStruct.Number = MPU_REGION_NUMBER1;
MPU_InitStruct.BaseAddress = 0x90000000;
MPU_InitStruct.Size = MPU_REGION_SIZE_16MB;
MPU_InitStruct.SubRegionDisable = 0x00;
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_CACHEABLE;
MPU_InitStruct.IsBufferable = MPU_ACCESS_NOT_BUFFERABLE;
HAL_MPU_ConfigRegion(&MPU_InitStruct);
HAL_MPU_Enable(MPU_PRIVILEGED_DEFAULT);
}
/* Entry Point */
ENTRY(Reset_Handler)
/* Highest address of the user mode stack */
_estack = ORIGIN(RAM) + LENGTH(RAM); /* end of "RAM" Ram type memory */
_Min_Heap_Size = 0xa00; /* required amount of heap */
_Min_Stack_Size = 0xa00; /* required amount of stack */
/* Memories definition */
MEMORY
{
RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 320K
FLASH (rx) : ORIGIN = 0x08000000, LENGTH = 1024K
QUADSPI (r) : ORIGIN = 0x90000000, LENGTH = 16M
SDRAM (xrw) : ORIGIN = 0xC0000000, LENGTH = 8M
}
/* Sections */
SECTIONS
{
/* The startup code into "FLASH" Rom type memory */
.isr_vector :
{
. = ALIGN(4);
KEEP(*(.isr_vector)) /* Startup code */
. = ALIGN(4);
} >FLASH
/* The program code and other data into "FLASH" Rom type memory */
.text :
{
. = ALIGN(4);
*(.text) /* .text sections (code) */
*(.text*) /* .text* sections (code) */
*(.glue_7) /* glue arm to thumb code */
*(.glue_7t) /* glue thumb to arm code */
*(.eh_frame)
KEEP (*(.init))
KEEP (*(.fini))
. = ALIGN(4);
_etext = .; /* define a global symbols at end of code */
} >FLASH
/* Constant data into "FLASH" Rom type memory */
.rodata :
{
. = ALIGN(4);
*(.rodata) /* .rodata sections (constants, strings, etc.) */
*(.rodata*) /* .rodata* sections (constants, strings, etc.) */
. = ALIGN(4);
} >FLASH
.ARM.extab (READONLY) : /* The "READONLY" keyword is only supported in GCC11 and later, remove it if using GCC10 or earlier. */
{
. = ALIGN(4);
*(.ARM.extab* .gnu.linkonce.armextab.*)
. = ALIGN(4);
} >FLASH
.ARM (READONLY) : /* The "READONLY" keyword is only supported in GCC11 and later, remove it if using GCC10 or earlier. */
{
. = ALIGN(4);
__exidx_start = .;
*(.ARM.exidx*)
__exidx_end = .;
. = ALIGN(4);
} >FLASH
.preinit_array (READONLY) : /* The "READONLY" keyword is only supported in GCC11 and later, remove it if using GCC10 or earlier. */
{
. = ALIGN(4);
PROVIDE_HIDDEN (__preinit_array_start = .);
KEEP (*(.preinit_array*))
PROVIDE_HIDDEN (__preinit_array_end = .);
. = ALIGN(4);
} >FLASH
.init_array (READONLY) : /* The "READONLY" keyword is only supported in GCC11 and later, remove it if using GCC10 or earlier. */
{
. = ALIGN(4);
PROVIDE_HIDDEN (__init_array_start = .);
KEEP (*(SORT(.init_array.*)))
KEEP (*(.init_array*))
PROVIDE_HIDDEN (__init_array_end = .);
. = ALIGN(4);
} >FLASH
.fini_array (READONLY) : /* The "READONLY" keyword is only supported in GCC11 and later, remove it if using GCC10 or earlier. */
{
. = ALIGN(4);
PROVIDE_HIDDEN (__fini_array_start = .);
KEEP (*(SORT(.fini_array.*)))
KEEP (*(.fini_array*))
PROVIDE_HIDDEN (__fini_array_end = .);
. = ALIGN(4);
} >FLASH
/* Used by the startup to initialize data */
_sidata = LOADADDR(.data);
/* Initialized data sections into "RAM" Ram type memory */
.data :
{
. = ALIGN(4);
_sdata = .; /* create a global symbol at data start */
*(.data) /* .data sections */
*(.data*) /* .data* sections */
*(.RamFunc) /* .RamFunc sections */
*(.RamFunc*) /* .RamFunc* sections */
. = ALIGN(4);
_edata = .; /* define a global symbol at data end */
} >RAM AT> FLASH
/* Uninitialized data section into "RAM" Ram type memory */
. = ALIGN(4);
.bss :
{
/* This is used by the startup in order to initialize the .bss section */
_sbss = .; /* define a global symbol at bss start */
__bss_start__ = _sbss;
*(.bss)
*(.bss*)
*(COMMON)
. = ALIGN(4);
_ebss = .; /* define a global symbol at bss end */
__bss_end__ = _ebss;
} >RAM
/* User_heap_stack section, used to check that there is enough "RAM" Ram type memory left */
._user_heap_stack :
{
. = ALIGN(8);
PROVIDE ( end = . );
PROVIDE ( _end = . );
. = . + _Min_Heap_Size;
. = . + _Min_Stack_Size;
. = ALIGN(8);
} >RAM
/* Remove information from the compiler libraries */
/DISCARD/ :
{
libc.a ( * )
libm.a ( * )
libgcc.a ( * )
}
.ARM.attributes 0 : { *(.ARM.attributes) }
/* >>> Custom sections here <<< */
BufferSection (NOLOAD) :
{
*(TouchGFX_Framebuffer TouchGFX_Framebuffer.*)
. = ALIGN(4);
} >SDRAM
ExtFlashSection :
{
*(ExtFlashSection ExtFlashSection.*)
. = ALIGN(4);
} >QUADSPI
/* Fonts & Texts into QSPI */
FontFlashSection :
{
*(FontFlashSection FontFlashSection.*)
. = ALIGN(4);
} >QUADSPI
TextFlashSection :
{
*(TextFlashSection TextFlashSection.*)
. = ALIGN(4);
} >QUADSPI
TouchGFX_ScratchbufferA (NOLOAD) :
{
*(TouchGFX_ScratchbufferA TouchGFX_ScratchbufferA.*)
. = ALIGN(4);
} >SDRAM
TouchGFX_ScratchbufferB (NOLOAD) :
{
*(TouchGFX_ScratchbufferB TouchGFX_ScratchbufferB.*)
. = ALIGN(4);
} >SDRAM
}Please ask me if you need any inputs I can share and update.
The below images wherer i have update my memory for DTCM, SRAM1 and SRAM2 at the end either the TougchGFX freeze or hard fault error or sometime i can't run other applicaitons
Thank you.
