STM32H755 LwIP FreeRTOS StackOverflowHook - Wrong configuration?

[Martin42]

Hi everyone,

I try to impement the LwIP Stack on my NUCLEO-H755ZI-Q Evaluation Board. I want to use the M4 core for the ethernet communication.

Unfortunately it results always in a StackOverflowHook if I connet with "Hercules" TCP Client and send a string.

I have configured the stack as described under https://github.com/stm32-hotspot/STM32H7-LwIP-Examples/tree/v1.2_ide_v1.9.0/STM32H745_Nucleo_M4_ETH.

The adapted LinkerScript "STM32H755ZITX_FLASH.ld" see below.

My TCPServer implementation tcpServerRAW.c is from https://controllerstech.com/stm32-ethernet-4-tcp-server/. 

I attached my .ioc fiile and a video of the Stackoverflow error.

Maybe there is a configuration mistake?

Thank you.

 

** File : LinkerScript.ld

...

/* Specify the memory areas */
MEMORY
{
 FLASH (rx) : ORIGIN = 0x08100000, LENGTH = 1024K
 /* ETH_CODE: split memory to data and ethernet buffers */
 RAM (xrw) : ORIGIN = 0x10000000, LENGTH = 128K /* ETH_CODE *
 ETH_RAM (xrw) : ORIGIN = 0x10020000, LENGTH = 160K /* ETH_CODE *
 MTI_SRAM (xrw) : ORIGIN = 0x38008000, LENGTH = 32K /* MTI: Shared Memory Bereich halber SRAM4 */ 
}

/* MTI: Shared Memory Bereich */
__MTI_SRAM_region_M4_start__ = ORIGIN(MTI_SRAM);
__MTI_SRAM_region_M7_start__ = ORIGIN(MTI_SRAM) + 1024;
__MTI_SRAM_region_end__ = ORIGIN(MTI_SRAM) + LENGTH(MTI_SRAM);
...
 /* ETH_CODE: add placement of DMA descriptors and RX buffers */
 .lwip_sec (NOLOAD) :
 {
 . = ABSOLUTE(0x10040000); /* 0x10040000 */
 *(.RxDecripSection) 
 
 . = ABSOLUTE(0x10040060); /* 0x10040060 */
 *(.TxDecripSection)
 
 . = ABSOLUTE(0x10040200); /* 0x10040200 */
 *(.Rx_PoolSection) 
 } >ETH_RAM
 /* ETH_CODE: end */
...
}

 

[FBL]

Hello @Martin42 

Check this FreeRTOS - stacks and stack overflow checking 

It should be helpful

[Martin42]

Hi,

thank you for the link to https://www.freertos.org/Stacks-and-stack-overflow-checking.html.

I have already implemented the vApplicationStackOverflowHook. In the attached video you can see the implemented function vApplicationStackOverflowHook() and how the program ends there.

I also monitored the stack size of each task with STM32CubeMonitor with the function https://www.freertos.org/uxTaskGetStackHighWaterMark.html. The stack size is for each task always the same size.

I have also added the configuration.
Maybe someone here can see at first glance what was configured incorrectly.

FreeRTOS M4 Configuration

LWIP Configuration

 

 

Also if I use the LWIP without FreeRTOS there is someting wrong...

 

 

[Martin42]

Hello,

after spending several hours trying the versions of the STMCubeIDE (1.6.1, 1.9.0, 1.13.1) with various combinations of the STM32Cube FW_H7 (V1.9.0, V1.9.1, V1.10.0, V1.11.0), I come to the conclusion that the application implementation is probably causing the problem.

/* Handle the incoming TCP Data */

static void tcp_server_handle (struct tcp_pcb *tpcb, struct tcp_server_struct *es)
{
	struct tcp_server_struct *esTx;
	/* allocate structure es to maintain tcp connection information */
	esTx = (struct tcp_server_struct *)mem_malloc(sizeof(struct tcp_server_struct));

	/* get the Remote IP */
	ip4_addr_t inIP = tpcb->remote_ip;
	uint16_t inPort = tpcb->remote_port;

	/* Extract the IP */
	char *remIP = ipaddr_ntoa(&inIP);

	esTx->state = es->state;
	esTx->pcb = es->pcb;
	esTx->p = es->p;

	char buf[100];
	memset (buf, '\0', 100);

	strncpy(buf, (char *)es->p->payload, es->p->tot_len);
	strcat (buf, "+ Hello from TCP SERVER\n");


	esTx->p->payload = (void *)buf;
	esTx->p->tot_len = (es->p->tot_len - es->p->len) + strlen (buf);
	esTx->p->len = strlen (buf);

	tcp_server_send(tpcb, esTx);

	pbuf_free(es->p);

	mem_free(esTx);
}

Incorrect memory access can also be seen in the example video from ControllersTech https://youtu.be/olYTNjM2kwE?t=598. I thought it was because of the LWIP version.

 

I adapted the function to write to the same memory as the received data. So far this has been working without any problems.

static void tcp_server_handle (struct tcp_pcb *tpcb, struct tcp_server_struct *es)
{
	char a[] = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
	uint8_t ui8_loop;
	static uint8_t ui8_switcher = 0;
	uint8_t *pui8_payload;
 
	pui8_payload = es->p->payload;

	for(ui8_loop = 0; ui8_loop < (es->p->len - 1); ui8_loop++)
	{
		*pui8_payload = a[(ui8_loop + ui8_switcher) % ((sizeof(a)/sizeof(a[0])))];
		pui8_payload++;
	}
	*pui8_payload = '\n';
	ui8_switcher++;
	tcp_server_send(tpcb, es);
}

 I have attached the original tcpServerRAW.c.

 

Is there a simple example of a TCP/IP or UDP client-server implementation?

 

 

[Martin42]

After further attempts, I have now reached an initial working state where the uC does not crash. I sent more than 2,000,000 TCP/IP frames.
I am using STM32CubeIDE 1.9 and STM32Cube FW_H7 V1.10.0. The LWIP stack will probably also work in the latest STM32CubeIDE 1.13.1, with STM32Cube_FW_H7_V1.11.1.