Edit : see this post for answers :
https://www.reddit.com/r/embedded/comments/13rcrqf/stm32h723zg_creating_tcpip_with_lwip_but_cannot/
reddit dot com /r/embedded/comments/13rcrqf/stm32h723zg_creating_tcpip_with_lwip_but_cannot/
Hello
Summary
- what I want to do
- what I have done
- question
##### WHAT I WANT TO DO #####
I want to send protobuf message from my STM32H723ZG (as a client) to a Raspberry using ethernet communication.
So far I am just trying to create an ethernet connection and to ping the adress of the stm.
##### WHAT I HAVE DONE #####
I looked at ressources online.
The most ineteresting seemed to be this set of videos from controllersTech expaining hwo to do a bunch of ethernet thin on stm32H7xxx:
as well as this github repo + video of a polish person doing a HTTPd project ont the exact same card as me stm32h723zg:
- https://github.com/trteodor/ownHTTP_withNUCLEO_STM32H723ZG/tree/master
- https://www.youtube.com/watch?v=aZ1AEwbcjIA
this tutoriel from ST on how to use MPU:
honorable mention to user manual lwIP (um1713) but it doesn't talk about cubeMx so not interesting for now.
I tried initializing a simple lwIp project on cubeMx
Following the controllersTech's videos I :
- enabled ETH (had to force PB0 to ETH_RXD2)
- checked the size of the descriptors (96B => 0x60)
- set the right memory address c.f. image 1 (0x3000 0000 for 1st descriptor [beginning of SRAM 1] 0x3000 0060 for second descripto)
- enabled cortex7 data and instruction cache
- enable lwIP
- select LAN8742 in "platform settings"
- keep the DHCP enabled (I also tried setting a static ip adress and it was inverted so now I keep the DHCP on)
- set the heap size to 10KB and start it at 0x3000 4000 (SRAM2)
- enable MPU
- set base address at 0x3000 000 (SRAM1)
- set the size to 32KB (SRAM 1 et 2)
- set memory type to non-shareable device (c.f. youtube.com/watch?v=6IUfxSAFhlw) basicaly put TEX 1 disable everything the most important is that it's not cacheable
From there I can generate the project.
I add "extern struct netif gnetif;" in the main and "ethernetif_input(&gnetif);" and "sys_check_timeouts();" to the super loop (while(1)).
I should now be able to build and run my program and ping the IP address but when debugging it I instantly get a hardfault.
When debugging using "step over", I notice that the programm/thread is stuck during "SCB_EnableDCache();"
I added
.lwip_sec (NOLOAD) : {
. = ABSOLUTE(0x30000000);
*(.RxDescripSection)
. = ABSOLUTE(0x30000060);
*(.TxDescripSection)
. = ABSOLUTE(0x300000C0);
*(.RxArraySection)
} >RAM_D2
In the flash script and i added the lines regarding the RxBuff
__attribute__((at(0x30000000))) ETH_DMADescTypeDef DMARxDscrTab[ETH_RX_DESC_CNT]; /* Ethernet Rx DMA Descriptors */
__attribute__((at(0x30000060))) ETH_DMADescTypeDef DMATxDscrTab[ETH_TX_DESC_CNT]; /* Ethernet Tx DMA Descriptors */
__attribute__((at(0x300000C0))) uint8_t Rx_Buff[ETH_RX_DESC_CNT][ETH_RX_BUFFER_SIZE]; /* Ethernet Receive Buffer */
#elif defined ( __GNUC__ ) /* GNU Compiler */
ETH_DMADescTypeDef DMARxDscrTab[ETH_RX_DESC_CNT] __attribute__((section(".RxDecripSection"))); /* Ethernet Rx DMA Descriptors */
ETH_DMADescTypeDef DMATxDscrTab[ETH_TX_DESC_CNT] __attribute__((section(".TxDecripSection"))); /* Ethernet Tx DMA Descriptors */
uint8_t Rx_Buff[ETH_RX_DESC_CNT][ETH_RX_BUFFER_SIZE] __attribute__((section(".RxArraySection"))); /* Ethernet Receive Buffer */
in the ethernetif.c (only the 2 lines regarding RxBuff, the otehr one already existed).
No change in behavior.
I can see that the domaine 2 now have lwip_sec however it is only 192Kb (the descriptors but not the buffer) and I cannot click it in the memory details window to show what is inside (on the controllersTech video he can click on it to show what is inside).
I tried using the cubeMx files from the github repo mentionned earlier
The github repo seems to have everything working well.
Since I cannot specify the buffer memory address I looked at his cubeMx file.
It uses an older version of cubeMx so I had the choice to continue or to migrate, I tried both and migrate worked.
Indeed his cubeMx file is different than mine: in ETH, he can specify the memory address of the buffer! (at the time I am writting that i cannot reproduce this but I clearly remember it)
The rest of the setup is similar.
However, I added some print on the console through UART to send the ip address (as decimal).
The whole project can be found here : https://drive.google.com/drive/folders/1GFPTB1tn3KoMvoncMS5x6Oi6IVztdZYd?usp=sharing
In that project I am able to run the project for about 2 seconds the first time I launch it before it gets stuck into hardfault.
When i run it after that it run for .5 second.
##### Question #####
If you can answer one of those that would greatly help me:
1) Do you see a problem in my cubeMx setup?
2) Do you see a problem in my code?
3) Do you have an exemple of a working TCP/IP client or server ?
4) Do you know why I cannot set the memory address of the buffer in cubeMx?
5) Do you know why I get hardfaults?
6) Why do I only get 192KB in lwip_sec (no buffer)?
7) Why can't I see what is inside lwip_sec?
Golden question ) How to make it work?
Thanks in advance for you response.
If something isn't clear, feel free to ask.
Regards
