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NRoma.6
NRoma.6
Associate
July 11, 2022
Question

USB connection between STM32F411 and modem RM500 quectel

  • July 11, 2022
  • 3 replies
  • 2795 views

Hi I am working on a project where a need to send AT commands through my MCU to a modem, the problem is that this modem only has a USB interface and not a UART interface, so I have a lot of doubts of how should I do this, i wanted to use the USB_Host_Library but I dont know hot to send the data to a certain interface and enpoint, since que AT command interface appears as a virtual COM (Interface 2 with 3 endpoints).

0693W00000QKqrQQAT.pngAnd which class should I use? Communication Host class?

Thanks in advice, Nicolas.

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3 replies

Sundar6444
Sundar6444
Graduate
August 5, 2024

Hello Nicolas,

 

Were you able to figure out this? I am also trying to interface the STM32 with Quectel RM500Q and would like to know more about this topic. 

 

Thanks in advance

Sundar.

Andrew Neil
Andrew Neil
Super User
August 5, 2024

Similar recent question here:

https://community.st.com/t5/stm32-mcus-embedded-software/can-t-enumerate-telit-modem-usb-port-as-a-cdc-acm-device-with/m-p/704856#M50143

 

@Sundar6444 wrote:

trying to interface the STM32 with Quectel RM500Q .

Have you contacted Quectel for support with that?

Maybe they can suggest tips for interfacing this module to microcontrollers?

Maybe they can suggest a solution better suited for microcontroller connection?

 

A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
Sundar6444
Sundar6444
Graduate
August 5, 2024

@Andrew Neil 

Thanks for sharing the link. It seems a lot of members are trying to interface STM controllers with modems.

Yes, i approached Quectel and looks like it is a dead end. They have asked me to develop a driver ourselves.

 

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