USB Huawei modem with stm32f407
Hi,
I'm working on application that uses a USB HUAWEI MU709 modem with STM32F407. First off all, i used the usb stack from keil to
implement the CDC mode:
https://www.keil.com/pack/doc/mw/USB/html/host_cust_tutorial.html
. I follow the USB PL2303 example to make my own
.
The usb communication works fine.
I�m trying to get PPP working.for that
, i used the network stack from kiel and modem Driver functions from MDK Middleware for IPv4 and IPv6 Networking.There is also an example with driver modem form keil for standard modem, i flowed it to make my own.
So, I proceed as follows:
1) I call netInitialize(); to intiailise the network stak
2) In a thread i called netPPP_Connect('*99***1♯', '', ''); to communicate with modem. This function call a callback called Notify specified in the Modem driver. In this callback, i implement my own AT command as in the example from keil.
I have two problems:
The first one is with
this Notifycallback, I always have a timeout response even if the modem responds correctly.The second one :
I successfully configured everything. Except that I�m getting garbage after �ATD� . I get the response CONNECT 21600000, then after a moment, I get something like this: ~�}♯�!}!} } }4}'}&} } } } }'}'}(...'.
I don't understand the meaning of this garbage?
Can you please give me an explanation, please, if you have experience with this kind of modems ?Best regards,
#usb-modem #stm32f407