【Windows嵌入式有奖征文系列】
【IT168 技术文档】SD驱动有两种架构,一为INTEL的,一为MS的,你如果用的MS的Public自带的代码,那就看注册表中HKEY_LOCAL_MACHINE\Drivers\BuiltIn项下的host,bus项设置好了没有,如果OK,那就检查HKEY_LOCAL_MACHINE\Drivers\Active下host,bus两层驱动跑起来没有.
逻辑上主要是:
SDHC_SC2410.dll是最底层,负责具体的发命令什么的,SDBus.dll是中间层,负责整合命令和管理,这两个在HKEY_LOCAL_MACHINE\Drivers\BuiltIn下,系统启动时就加载,SDMemory.dll是最高层.正常工作时,一旦卡插入,SDHC_SC2410.dll的IST检测到中断,通知SDBus.dll做初始化工作,OK后SDBus.dll加载SDMemory.dll,系统才能识别卡.
1.WINCE 下 SD驱动程序包括 三部分
HOST 硬件地层部分 对应文件一般是SDHC_SC2410.dll
BUS 中间逻辑命令层 SDBUS.DLL
CLIENT 上层 SDMEMORY.DLL
SD 卡驱动是表准驱动,一般不需要独立去写.
2.在WINCE 项目中添加SD 卡的相关的组建,例如:
CATALOG->device drivers->SDIO->SDMemory
CATALOG->device drivers->SDIO->SDIO Host->Samsung 2410 SDIO Host
CATALOG->device drivers-> Storage Devices ->Storage Devices ->Secure Digital/Multimedia Card (SD/MMC)等
3.添加文件到 PLATFORM.BIB 中.
SDBusDriver.dll $(_FLATRELEASEDIR)\SDBusDriver.dll NK SH
; SD host
SDCSDCard.DLL $(_FLATRELEASEDIR)\SDCSDCard.DLL NK SH
SDMemory.dll $(_FLATRELEASEDIR)\SDMemory.dll NK SH
4.添加注册表项目:
; two step load process, the bus driver will perform. it''s
; own ActivateDevice call in the Entry point provided
; this way the driver even though it is a Builtin device, it can be unloaded
[HKEY_LOCAL_MACHINE\Drivers\Builtin\SDBusDriver]
"Order"=dword:20
"Dll"="SDBusDriver.dll"
"Entry"="SDBusDriverStartUp"
[HKEY_LOCAL_MACHINE\Drivers\SDCARD\SDBusDriver]
"Order"=dword:20
"Dll"="SDBusDriver.dll"
"Prefix"="SDC"
"ThreadPriority"=dword:64 ; default thread priority for dispatch thread
"RequestListDepth"=dword:30 ; pre-allocated requests
;"ZoneMask"=dword:e01d ; example zone mask
[HKEY_LOCAL_MACHINE\System\StorageManager\Profiles\SDMemory]
"Name"="SD Memory Card"
"Folder"="Storage Card"
; "PartitionDriver"="" ; removable storage cannot have partitions
[HKEY_LOCAL_MACHINE\System\StorageManager\Profiles\MMC]
"Name"="MMC Card"
"Folder"="Storage Card"
; "PartitionDriver"="" ; removable storage cannot have partitions
; SD Memory Storage class driver
[HKEY_LOCAL_MACHINE\Drivers\SDCARD\ClientDrivers\Class\SDMemory_Class]
"Dll"="SDMemory.dll"
"Prefix"="DSK"
"FSD"="FATFS.DLL"
"IOCTL"=dword:4 ; DISK_IOCTL_INITIALIZE, sent to driver by DeviceManager
"BlockTransferSize"=dword:40 ; Send no more than 64 blocks ofdataper bus transfer
;"SingleBlockWrites"=dword:1 ; alternatively force the driver to use single block access
"Profile"="SDMemory"
"IClass"=multi_sz:"{A4E7EDDA-E575-4252-9D6B-4195D48BB865}",
"{A32942B7-920C-486b-B0E6-92A702A99B35}"
; MMC Storage Class Driver
[HKEY_LOCAL_MACHINE\Drivers\SDCARD\ClientDrivers\Class\MMC_Class]
"Dll"="SDMemory.dll"
"Prefix"="DSK"
"FSD"="FATFS.DLL"
"IOCTL"=dword:4 ; DISK_IOCTL_INITIALIZE, sent to driver by DeviceManager
"BlockTransferSize"=dword:40 ; Send no more than 64 blocks of data per bus transfer
;"SingleBlockWrites"=dword:1 ; alternatively force the driver to use single block access
"Profile"="MMC"
"IClass"=multi_sz:"{A4E7EDDA-E575-4252-9D6B-4195D48BB865}",
"{A32942B7-920C-486b-B0E6-92A702A99B35}"
; setting for SD bus driver to load driver
[HKEY_LOCAL_MACHINE\Drivers\SDCARD\HostControllers\SDSC]
"Dll"="SDCSDCard.dll"
"Prefix"="SDC"
5.系统启动后,SDBus.dll和SDHC_SC2410.dll能在注册表HKEY_LOCAL_MACHINE\Drivers\Active 看到.
6.调试.
一般先从底层开始,是否发生系统硬件中断,打印中断信息.
返回系统中断信息 :SYS_SDXXX
说明系统硬件是正常的 ,再开始调试其他部分.
