Facing Difficulties with TCP/Ethernet on Nucleo-H753ZI without RTOS

[imium]

Hello ST Community,

I am currently working on a project using the Nucleo-H753ZI without an RTOS, and I have followed a tutorial by Controllers Tech to set up TCP/Ethernet. I am using Static IP assignment.

I can Transmit and Receive data though Hercules Tool. However, when I try to use the ModbusTool for TCP connection, the STM32 does not seem to receive any data.

Problem Description:

• Ethernet setup is successful, and data transfer works with Hercules software.
• Using ModbusTool for TCP connection results in no data being received by the STM32.

Configuration Details:

• While following the Controllers Tech tutorial, I noticed some differences in the CubeMX configuration options compared to what was shown in the tutorial. Despite these differences, I managed to configure the Ethernet settings and get it working for data transfer using Hercules software.
• Differences:
  1. I have used RMII instead of MII.
  2. I do not have Rx Buffer Address option in Ethernet Parameter Setting.

Steps Taken:

• Followed the Controllers Tech tutorial.
• Made necessary adjustments in CubeMX.
• Tested data transfer with Hercules software successfully.
• Unable to receive data using ModbusTool.

Could anyone provide insights into why the STM32 is not receiving data from the ModbusTool? Are there specific configurations or settings I might be missing? Any advice or guidance would be greatly appreciated. I have attached the IOC file for reference.

Thank you in advance for your help!

Best regards,
Umair Jarullah.

[ASEHST]

Hello @imium,

For successful Modbus communication, it's crucial that your application correctly implements the Modbus protocol.

You can refer to the Modbus protocol reference guide here for detailed information. Additionally, a free Modbus stack is available for download at FreeModbus, which might be suitable for your project needs.

With Regards,

[imium · Accepted solution]

Thanks for youor reply. I found it yesterday that, there was a logical error in my code i was using strncpy that was causing problem, so i changed it to memcpy.