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Shashanksd07
Associate
June 15, 2024
Question

Unable to transmit the data to EC25 Modem with STM32F407VG

  • June 15, 2024
  • 3 replies
  • 1678 views

Hi,

I currently working on the EC25 Modem using STM32F407VG support for CDC, where I am able to get all the enumerated values of Device Descriptors, Configuration descriptor and Interfaces but unable to transmit the data and get the response back, and I have used the CDC example code of STM32.So can someone guide me regarding this issue.

AT Command Used: "AT\r\n"

@STea
@Danish1 

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    3 replies

    Andrew Neil
    Andrew Neil
    Super User
    June 15, 2024
    @Shashanksd07 wrote:

    the EC25 Modem  

    You mean this: https://www.quectel.com/product/lte-ec25-series/ ?

    That seems to be just a module? So how do you have it connected to your STM32F407VG ?

    Have you verified that you can communicate with it from a PC?

    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.
    Shashanksd07Author
    Associate
    June 15, 2024

    I have integrated the EC25 on the mini pcie evb v1.02 kit and then using USB cable to STM controller and I have checked it via serial (putty) but not with STM CDC example.

    Andrew Neil
    Andrew Neil
    Super User
    June 15, 2024
    @Shashanksd07 wrote:

     I have checked it via serial (putty) but not with STM CDC example.

    You mean your "EC25 on the mini pcie evb v1.02 kit" does work when connected to a PC?

    So does your STM32F407VG work with any other USB CDC devices?

    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.
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