Ethernet + LwIP + FreeRTOS Issues on NUCLEO-H753ZI

[gregoor]

Hi guys, 

I have a STM32 NUCLEO-H753ZI board and the overall goal is to run open62541. In order to do that, I need a working LwIP stack and Ethernet connection. I have done a lot of research and tried multiple settings, but can´t get it working. Below, I´ll describe what I have done so far / settings in the .ioc I have made.

It would be awesome if you could tell me, where my mistake is. 

Using STM32CubeIDE Version: 1.19.0 Build: 25607_20250703_0907 (UTC).

Clock Configuration:

Input frequency = 8MHz -> PLL Source Mux = HSE -> System Clock Mux = PLLCLK (Enable CSS) 

-> SYSCLOCK = 400 MHz -> D1 CPRE Prescaler = /1 -> 400 MHz -> HPRE Prescaler = /2 -> 200 MHz

-> D1 PPRE, D2 PPRE1, D2 PPRE2, D3 PPRE = /2

System Core:

RCC: 

HSE = BYPASS Clock Source

LSE = Crystal

Power Regulator Voltage Scale = Power Regulator Voltage Scale 1

SYS:

Timebase Source = TIM6

NVIC:

Ethernet global interrupt = Enabled, Preemption Priority = 5

Ethernet wake-up interrupt through EXTI line 86 = Enabled, Preemption Priority = 5

CORTEX_M7:

See Screenshot attached below.

Connectivity:

ETH: 

Enabled in RMII

NVIC Settings as described in NVIC

GPIO Settings: Set Maximum output speed to "Very High" for every Pin

Middleware and Software Packs:

FreeRTOS:

Using CMSIS v1 (FreeRTOS version 10.3.1, CMSIS-RTOS version 1.02)

ENABLE_FPU = Enabled

MINIMAL_STACK_SIZE = 1024 Words

TOTAL_HEAP_SIZE = 300000 Bytes

Memory Management scheme = heap_4

LWIP:

Platform Settings: LAN8742 and as Solution also LAN8742

General Settings: DHCP = Disabled, Set own IP-Address, Netmask and Gateway (those are fine) 

General Settings: ICMP, DNS, UDP, TPC = Enabled 

Key Options: Please see .pdf with Screenshots below

Preprocessor:

Under Properties -> C/C++ Build -> MCU/MPU GCC Compiler -> Preprocessor I added "DATA_IN_D2_SRAM"

to the Define symbols.

_FLASH.id:

/* Specify the memory areas */
MEMORY
{
  FLASH (rx)     		: ORIGIN = 0x08000000, LENGTH = 2048K
  DTCMRAM (xrw) 	 	: ORIGIN = 0x20000000, LENGTH = 128K
  RAM_D1 (xrw)   		: ORIGIN = 0x24000000, LENGTH = 512K
  RAM_D2   (xrw) 		: ORIGIN = 0x30020000, LENGTH = 256K   /* SRAM2 */
  RAM_D2_SRAM3 (xrw) 	: ORIGIN = 0x30040000, LENGTH = 32K    /* SRAM3 */
  RAM_D3 (xrw)   		: ORIGIN = 0x38000000, LENGTH = 64K
  ITCMRAM (xrw)  		: ORIGIN = 0x00000000, LENGTH = 64K
}

And between .data and .bss I added:

  /* --- Ethernet DMA descriptors -> D2 SRAM3 --- */
  ETH_DESCRIPTORS (NOLOAD) :
  {
    . = ALIGN(32);
    *(.RxDecripSection)
    *(.TxDecripSection)
    . = ALIGN(32);
  } >RAM_D2_SRAM3

  /* --- Ethernet buffers -> D2 SRAM2 --- */
  ETH_BUFFERS (NOLOAD) :
  {
    . = ALIGN(32);
    *(.Rx_PoolSection)
    *(.RxArraySection)
    *(.TxArraySection)
    . = ALIGN(32);
  } >RAM_D2

And in ethernetif.c there is:

#if defined ( __ICCARM__ ) /*!< IAR Compiler */
#pragma location = 0x30000100
extern u8_t memp_memory_RX_POOL_base[];

#elif defined ( __CC_ARM ) /* MDK ARM Compiler */
__attribute__((section(".Rx_PoolSection"))) extern u8_t memp_memory_RX_POOL_base[];

#elif defined ( __GNUC__ ) /* GNU */
__attribute__((section(".Rx_PoolSection"))) extern u8_t memp_memory_RX_POOL_base[];
#endif

in the .map there is:

ETH_DESCRIPTORS
                0x30040000       0xc0
                0x30040000                        . = ALIGN (0x20)
 *(.RxDecripSection)
 .RxDecripSection
                0x30040000       0x60 ./LWIP/Target/ethernetif.o
                0x30040000                DMARxDscrTab
 *(.TxDecripSection)
 .TxDecripSection
                0x30040060       0x60 ./LWIP/Target/ethernetif.o
                0x30040060                DMATxDscrTab
                0x300400c0                        . = ALIGN (0x20)

ETH_BUFFERS     0x30020000     0x6220
                0x30020000                        . = ALIGN (0x20)
 *(.Rx_PoolSection)
 .Rx_PoolSection
                0x30020000     0x6203 ./LWIP/Target/ethernetif.o
                0x30020000                memp_memory_RX_POOL_base
 *(.RxArraySection)
 *(.TxArraySection)
                0x30026220                        . = ALIGN (0x20)

When debugging, it always ends in an endless loop somewhere or jumps to a Hard Fault. 

Couldn`t really figure out why or which specific error it is. 

If you have any tips or maybe some kind of example project where LwIP + FreeRTOS is working, that would be awesome. 

Cheers, 

Gregor