Unable to transmit the data to EC25 Modem with STM32F407VG

[Shashanksd07]

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 

[Andrew Neil]

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@Shashanksd07 wrote:

the EC25 Modem  

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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?

[Shashanksd07]

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]

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@Shashanksd07 wrote:

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

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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?