Making Ethernet work with LwIP and FreeRTOS on STM32F7

[_AdamNtrx]

I am writing this post in case anybody encounters a similar problem.

I had a problem with assigning IP address to STM32F769I-DISCO devboard and communicating with it via Ethernet while using LwIP and FreeRTOS. The solution to this problem was disabling D-Cache in Cortex_M7 settings in STM32CubeMX. I don't know if I would ever think about trying this out if not for the old forum thread I found.

[mƎALLEm · Accepted solution]

Hello,

Disabling the cache is not a good solution because that decreases the overall system performance. But disable the cache on the a specific regions using MPU where the Tx/Rx descriptors and LWIP memory pool are located.

See for example this article on STM32H7 / section Cortex-M7 configuration.

[_AdamNtrx]

I remember trying out the MPU configuration in sample HTTP server program and it didn't work. It's possible that I did something incorrectly though.

[mƎALLEm]

---

@_AdamNtrx wrote:

I remember trying out the MPU configuration in sample HTTP server program and it didn't work. It's possible that I did something incorrectly though.

---

Yes I think so.

[JongOk Baek]

Hello,

I attached project file for STM32F7 with FreeRTOS and LwIP.

it is operated on STM32F767 NUCLEO board. (without Cache)

Refer to the attached file.