Android-4.2-3G porting path libusb (1)

Android-4.2-3G porting path libusb (1)

Some time ago, we transplanted 3G modules to smart TV and found that Baidu Google, which transplanted 3G, found that it was basically on the linux development board,

Here, I will record the whole process of porting, so that others can avoid detours. If you have any suggestions or do not want to send a message, please leave a message ~

 

Currently, all 3G modules use usb interfaces. It is identified as a usb storage device by default in the android system and will be mounted as a usb storage device through Vold!

Therefore, you must switch the device type to a Modem device. Only in this way can you achieve normal communication between the host and the module. Here you need a conversion driver,

 

Only through the mode conversion is correct identification of 3G devices, here first parse the usb-modeswitch required API porting.

 

 

2. Compile libusb/libusb-compat

You can download the latestLibusb-1.0.9AndLibusb-compat-0.1.4(Compatible with long versions ),

Decompress the package to our android source codeExternal, The two lib is for the following usb_modeswitch service dynamic library, can be directly on the linux cross compilation, and finally can get libusb. so libusb-compat.so, the compilation method has a lot of online!

I want to transplant it to the android platform, so I will compile it in external using the android compilation mechanism!

Add Android. mk to the two folders

First look at the libusb Android. mk:

 

#jscese add this android.mk to compile libusb.so for usb_modelswitch 140819LOCAL_PATH := $(call my-dir)include $(CLEAR_VARS)common_src :=libusb/core.c libusb/descriptor.c libusb/io.c libusb/sync.c libusb/os/linux_usbfs.c common_include :=$(LOCAL_PATH)/ $(LOCAL_PATH)/libusb $(LOCAL_PATH)/libusb/osLOCAL_MODULE := libusbLOCAL_SRC_FILES :=$(common_src)LOCAL_C_INCLUDES +=$(common_include)include $(BUILD_SHARED_LIBRARY)

 

We can see that only five. c source files are compiled. Some of the libusb packages we downloaded do not need to be modified or configured,

My libusb source code download: http://download.csdn.net/detail/jscese/7868431

 

Android. mk of libusb-compat:

 

#jscese add this android.mk to compile libusb-compat.so for usb_modelswitch 140819LOCAL_PATH := $(call my-dir)include $(CLEAR_VARS)LIBUSB_DIR :=external/libusbcommon_src :=libusb/core.c common_include :=$(LOCAL_PATH)/ $(LOCAL_PATH)/libusb $(LIBUSB_DIR)/libusbLOCAL_MODULE := libusb-compatLOCAL_SRC_FILES :=$(common_src)LOCAL_C_INCLUDES +=$(common_include)LOCAL_SHARED_LIBRARIES := libusbinclude $(BUILD_SHARED_LIBRARY)

 

We can see that libusb-compat introduces libusb

My libusb-compat source code download: http://download.csdn.net/detail/jscese/7868445

 

You can use the following code in the source code:

 

mmm external/libusb

Compile the corresponding. so

 

 

Here we will record the libusb port first, step by step ..