710MUX多路复用驱动程序Mux07_10.dll把一路实际的物理串口虚拟成两路串口。
1。一路虚拟串口是COM7-----用于一般的AT 命令发送
2。一路虚拟串口是COM9-----用于ppp connection over CSD / GPRS
看对应的注册表项就可以清楚，下面的内容来自C:/WINCE600/PLATFORM/DEVICEEMULATOR/FILES/platform.reg文件
[HKEY_LOCAL_MACHINE/Drivers/BuiltIn/RIL]
"Dll"="rilgsm.dll"
;DEVFLAGS_LOADLIBRARY 0x00000002 // Use LoadLibrary instead of LoadDriver
"Flags"=dword:2
"Index"=dword:1
"Order"=dword:3
"Prefix"="RIL"
"ComPort"="COM7:"
"RebootOKEvName"="Mux0710_RebootOK" ; name of the event used to signal reboot OK
"RebootKOEvName"="Mux0710_RebootKO" ; name of the event used to signal reboot failure
[HKEY_LOCAL_MACHINE/Drivers/BuiltIn/GSM0710_1]
"Prefix"="COM"
"Dll"="Mux07_10.dll"
"DeviceArrayIndex"=dword:1
"Index"=dword:7
"Order"=dword:2
; power manager enabled device driver
"IClass"="{A32942B7-920C-486b-B0E6-92A702A99B35}"
; GSM 07.10 specific
"GSM_0710_DLCI"=dword:1 ; Rem: Dlci also define priority (lowest is low prio)
"GSM_0710_TYPE"=dword:1 ; boolean: 1 (true) is for AT cmd, 0 (false) is for Data
; COM9 for ppp connection over CSD / GPRS
[HKEY_LOCAL_MACHINE/Drivers/BuiltIn/GSM0710_2]
"Prefix"="COM"
"Dll"="Mux07_10.dll"
"DeviceArrayIndex"=dword:1
"Index"=dword:9
"Order"=dword:3
; power manager enabled device driver
"IClass"="{A32942B7-920C-486b-B0E6-92A702A99B35}"
; GSM 07.10 specific
"GSM_0710_DLCI"=dword:2 ; Rem: Dlci also define priority (lowest is low prio)
"GSM_0710_TYPE"=dword:1 ; boolean: 1 (true) is for AT cmd, 0 (false) is for Data
; COM1 for underlying GSM 07.10
[HKEY_LOCAL_MACHINE/Software/Microsoft/GSM07_10]
"ComPort"="COM1:"
"BaudRate"=dword:1C200 ; 115200
"FrameOption"=dword:1 ; Advanced
再看Mux07_10.dll驱动程序对应的注册表项，下面的内容来自C:/WINCE600/PUBLIC/CELLCORE/710MUX/mux07_10.reg
; COM7 for RIL AT command
; ----------------------------------------
[HKEY_LOCAL_MACHINE/Drivers/BuiltIn/RIL]
"ComPort"="COM7:"
"RebootOKEvName"="Mux0710_RebootOK" ; name of the event used to signal reboot OK
"RebootKOEvName"="Mux0710_RebootKO" ; name of the event used to signal reboot failure
;Init string: $VSELECT=1|%DATA=2,"UART",0,2,"SER","UART",0,1| => handset for voice,redirect PPP data from DLCI 1 to DLCI 2
"ComInitString"=hex:/
24,00,56,00,53,00,45,00,4c,00,45,00,43,00,54,00,3d,00,31,00,7c,00,/
25,00,44,00,41,00,54,00,41,00,3d,00,32,00,2c,00,22,00,55,00,41,00,52,00,54,00,22,/
00,2c,00,30,00,2c,00,32,00,2c,00,22,00,53,00,45,00,52,00,22,00,2c,00,22,00,55,00,/
41,00,52,00,54,00,22,00,2c,00,30,00,2c,00,31,00,7c,00,00,00
[HKEY_LOCAL_MACHINE/Drivers/BuiltIn/GSM0710_1]
"Prefix"="COM"
"Dll"="Mux07_10.dll"
"DeviceArrayIndex"=dword:1
"Index"=dword:7
"Order"=dword:2
; power manager enabled device driver
;-------------------------------------
"IClass"="{A32942B7-920C-486b-B0E6-92A702A99B35}"
; GSM 07.10 specific
;---------------------
"GSM_0710_DLCI"=dword:1 ; Rem: Dlci also define priority (lowest => low prio)
"GSM_0710_TYPE"=dword:1 ; boolean: 1 (true) => AT cmd, 0 (false) => Data
; monitor channel activity
;---------------------------
"GSM_0710_ACTIVITY_TIMEOUT"=dword:2710 ; time-out on channel activity in ms
;
; remark:
; the Mux driver will notify the device
; when this time-out expire
; if there is no activity
; COM9 for ppp connection over CSD / GPRS
; ----------------------------------------
[HKEY_LOCAL_MACHINE/Drivers/BuiltIn/GSM0710_2]
"Prefix"="COM"
"Dll"="Mux07_10.dll"
"DeviceArrayIndex"=dword:1
"Index"=dword:9
"Order"=dword:3
; power manager enabled device driver
;-------------------------------------
"IClass"="{A32942B7-920C-486b-B0E6-92A702A99B35}"
; GSM 07.10 specific
;---------------------
"GSM_0710_DLCI"=dword:2 ; Rem: Dlci also define priority (lowest => low prio)
"GSM_0710_TYPE"=dword:1 ; boolean: 1 (true) => AT cmd, 0 (false) => Data
; monitor channel activity
;---------------------------
"GSM_0710_ACTIVITY_TIMEOUT"=dword:4E20 ; time-out on channel activity in ms
;
; remark:
; the Mux driver will notify the device
; when this time-out expire
; if there is no activity
; COM2 for underlying GSM 07.10
[HKEY_LOCAL_MACHINE/Software/Microsoft/GSM07_10]
"ComPort"="COM2:"
"BaudRate"=dword:1C200 ; 115200
"FrameOption"=dword:1 ; 1 - Advanced; 0 -Basic
"FrameSize"=dword:00000040 ; max data size
//##########################################################################################################
从上面的内容可以看出Mux07_10.dll被加载2次，虚拟出两个虚拟串口，COM7+COM9，COM7用于一般的AT命令，COM9用于ppp connection over CSD / GPRS。
但上面的两个文件的对应用到的物理串口不一样，这个是要特别注意的地方。
; COM1 for underlying GSM 07.10
[HKEY_LOCAL_MACHINE/Software/Microsoft/GSM07_10]------platform.reg文件
"ComPort"="COM1:"
"BaudRate"=dword:1C200 ; 115200
"FrameOption"=dword:1 ; Advanced
//----------------------------------------------------------------------------
; COM2 for underlying GSM 07.10
[HKEY_LOCAL_MACHINE/Software/Microsoft/GSM07_10]-------------mux07_10.reg
"ComPort"="COM2:"
"BaudRate"=dword:1C200 ; 115200
"FrameOption"=dword:1 ; 1 - Advanced; 0 -Basic
"FrameSize"=dword:00000040 ; max data size
注册表的统一，估计要用到编译的时候，相同的注册表项会覆盖的功能！！！-----注意底层实际的物理串口只能有一个。
看到物理串口要虚拟出两个物理串口，所以Mux07_10.dll驱动必须先于rilgsm.dll被加载，因为rilgsm.dll要用虚拟出的COM7来进行AT命令发送。
看系统编译后的reginit.ini文件就应该可以清楚最后的注册表情况，对于[HKEY_LOCAL_MACHINE/Software/Microsoft/GSM07_10]注册表项是谁覆盖了谁。